Sowing machine and sowing method

Abstract

Provided are a seeding machine and a seeding method with which it is possible to easily grasp a travel position even in a farmland in a water-irrigated state and to sow in a prescribed position. A seeding machine (1, 9, 10, 12, 13, 16) in which a seeder (5) for seeding seeds to an agricultural field is provided on a base body (2) supported by wheels (3, 3R, 3L, 4R, 4L) configured so as to be able to travel in the agricultural field in an irrigated state is provided with position detection devices (6, 15) provided on the base body (2). The position detection devices (6, 15) are engaged with a guide, and at least one of a rut formed in the farmland by the wheels (3, 3R, 3L, 4R, 4L), a waterway formed in advance in the farmland, a linear groove formed in advance in the farmland, and a flexible linear body (14) which is linearly expanded in advance in the farmland.

Description

Technical Field

[0001] The present invention relates to a seeder and a method for sowing seeds on farmland, and more particularly to a seeder and a method for sowing seeds at a constant interval on farmland in a watered state. Background Art

[0002] With the aging of agricultural workers and the globalization of agricultural product circulation, labor-saving of farm work and reduction of agricultural product production costs have become issues that should be addressed. In order to solve these issues, for example, in rice cultivation, the direct seeding method of directly sowing seeds on farmland (hereinafter sometimes referred to as paddy fields) is becoming popular for the purpose of saving labor for raising seedlings and transplanting. An example of a method for manufacturing iron powder-coated rice seeds used in the flooded direct seeding method of directly sowing seeds on flooded farmland is described in Patent Document 1. The iron powder-coated rice seeds are formed by coating the rice seeds with iron powder having a high specific gravity, so they are easy to sink in water. Therefore, in the flooded direct seeding method, the use of the seeds described in Patent Document 1 has the advantages of being able to prevent or inhibit the floating and outflow of seeds in the flooded paddy field and being able to prevent or inhibit bird damage, and therefore has attracted attention.

[0003] In addition, Patent Document 2 describes an example of a watering direct seeding machine for sowing seeds on irrigated farmland, and the watering direct seeding mechanism is used to prevent the power transmission part from being contaminated by mud flying from the farmland when driving on the farmland. Patent Document 3 describes a seeding machine that can control the burial depth of seeds on the irrigated field surface. Patent Document 4 describes a seeding machine equipped with a harrowing rotating device called a harrow device that can achieve watering direct seeding. Patent Document 5 describes an autonomous driving system for a working vehicle that obtains position information of a working vehicle such as a rice transplanter based on radio waves received from a positioning satellite of a GNSS (Global Navigation Satellite System) and uses the position information.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 4441645

[0007] Patent Document 2: Japanese Patent Application Publication No. 2013-21943

[0008] Patent Document 3: Japanese Patent No. 6559978

[0009] Patent Document 4: Japanese Patent Application Publication No. 2021-180650

[0010] Patent Document 5: Japanese Patent Application Publication No. 2022-111121 Summary of the invention

[0011] Problems to be solved by the invention

[0012] When a seed drill is driven in a flooded paddy field to perform row sowing or spot sowing, the ruts formed by the seed drill driving in the paddy field, the ribs formed by the marker, etc. are sometimes used as a rough target of the driving position of the seed drill. However, in the flooded direct seeding method, the above-mentioned ruts, ribs, etc. are located under the water surface and are not easy to see, so it becomes difficult to grasp the driving position of the seed drill, and thus it is difficult to sow seeds at a specified position. In addition, if mud is rolled up due to the driving of the seed drill, it is further difficult to confirm the ruts, ribs, etc., and it is further difficult to sow seeds at a specified position. Therefore, in the past, in order to sow seeds at a specified position in a flooded paddy field, it was necessary to temporarily drain the water to expose the soil surface of the paddy field. In addition, if the soil of the paddy field is exposed due to drainage, weeds will grow in the drained paddy field, or the weeds will easily prosper, and the above-mentioned advantages of the flooded direct seeding method may be impaired. Therefore, after sowing seeds in the flooded paddy field, it is necessary to quickly rehydrate the water. That is, in the past, in the flooding direct seeding method, even if the iron powder-coated rice seeds described in Patent Document 1 were used, it would take a lot of effort to drain and rehydrate the water, and, accordingly, water resources had to be used redundantly, and there was room for improvement in these aspects.

[0013] In addition, even when using any of the irrigation direct seeding machine described in Patent Document 2 and the seeding machine described in Patent Document 3 and Patent Document 4 to sow seeds in a paddy field under irrigation, the water has to be temporarily drained in order to confirm the driving position of the irrigation direct seeding machine or the seeding machine and sow seeds at a predetermined position. Therefore, there is the same problem as in Patent Document 1.

[0014] If the autonomous driving system described in Patent Document 5 is installed on a seed drill that is sowing seeds on a irrigated farmland and a situation occurs in which the signal from the positioning satellite cannot be received, the position of the seed drill cannot be determined, and there is a possibility that seeds may be sown in a place that has already been sown, leaving unsown areas. As a result, there is a possibility that seeds may not be sown regularly on the entire farmland.

[0015] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a seed drill and a seeding method that can easily grasp the travel position even in a farmland in a flooded state and can seed at a predetermined position.

[0016] Means for solving problems

[0017] In order to achieve the above-mentioned purpose, the present invention makes the following scheme:

[0018] [1] A seed drill having a base supported by wheels configured to be able to travel on a farmland in a watered state and provided with a seed drill for sowing seeds on the farmland, wherein the seed drill has a position detection device provided on the base, and the position detection device uses at least any one of ruts formed on the farmland by the wheels, a water channel pre-formed on the farmland, a linear groove pre-formed on the farmland, and a flexible linear body pre-stretched in a straight line on the farmland as a guide and engages with the guide.

[0019] [2] According to the seed drill described in [1], the position detection device uses at least any one of the ruts formed by the wheels on the farmland, the water channels pre-formed on the farmland, and the linear grooves pre-formed on the farmland as a guide, and the base is deformed or swung in the left and right directions by moving relative to the guide in the left and right directions relative to the travel direction.

[0020] [3] According to the seed drill described in [2], the position detection device is configured as a rod, and a support mechanism is provided on the base, wherein the support mechanism is configured to support the position detection device with a predetermined interval between the position detection device and the base in the left-right direction.

[0021] [4] According to the seed drill described in [1], the position detection device uses a flexible linear body pre-stretched linearly on the farmland as a guide, and is engaged with the linear body in a relatively movable manner.

[0022] [5] According to the seed drill described in [4], the position detection device has either a gap or a hole, the gap is configured to engage the linear body in a manner that allows relative movement, and the hole is formed to penetrate in the plate thickness direction of the position detection device to engage the linear body in a manner that allows relative movement.

[0023] [6] The seed drill according to [1] further includes a position information acquisition device that acquires position information based on a signal obtained from a satellite positioning system.

[0024] [7] A sowing method, comprising sowing seeds using the seeder described in any one of [1] to [5].

[0025] [8] The sowing method according to [7], wherein the surface of the seed is coated with a seed coating agent comprising a metal material, and the specific gravity of the seed is 1.2 g / cm 3 Above and 4.0g / cm 3 the following.

[0026] Effects of the Invention

[0027] According to the present invention, in a farmland in a watered state, at least one of the ruts formed by the wheels of the seed drill, the waterway preformed on the farmland, the linear groove preformed on the farmland, and the flexible linear body pre-stretched on the farmland in a straight line is used as a guide. And, when the seed drill is driven along the guide, the position detection device is engaged with the guide. When the seed drill is driving along the guide, the position detection device moves with the seed drill in a state of maintaining a substantially constant distance relative to the guide, so it does not deform or swing in the left and right directions relative to the traveling direction. Or, such deformation and swing are smaller than the case where the seed drill moves in the left and right directions in a manner close to and away from the guide. In contrast, if the seed drill moves in the left and right directions in a manner close to and away from the guide, the distance between the guide and the position detection device changes, and the position detection device deforms or swings in the left and right directions. Therefore, the position of the seed drill at the current time point relative to the guide in the left and right directions can be grasped based on the deformation amount and swing size of the position detection device. That is, it is possible to determine whether it is driving along the guide. When the sowing machine is traveling using the linear body as a guide, if the sowing machine moves in the left-right direction relative to the traveling direction, the linear body bends at the engagement point between the linear body and the position detection device. The position of the sowing machine relative to the linear body can be grasped by using the bending angle of the linear body. As a result, the sowing machine can be driven along the guide even in a farmland in a flooded state, and can be sown at a predetermined position. In addition, since the position detection device is provided on the base of the sowing machine, it is easy to grasp the driving position of the sowing machine relative to the guide in the left-right direction and to correct the driving position of the sowing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a diagram showing an example of a seed drill according to the first embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A side view of a planter is shown.

[0030] Figure 3 It is a diagram for explaining the bending deformation of the position detection device accompanying the movement of the seed drill in the left-right direction.

[0031] Figure 4 This is a diagram showing an example of a seed drill according to a second embodiment of the present invention.

[0032] Figure 5 yes Figure 4 A side view of a planter is shown.

[0033] Figure 6This is a diagram showing an example of a seed drill according to a third embodiment of the present invention.

[0034] Figure 7 yes Figure 6 A side view of a planter is shown.

[0035] Figure 8 This is a diagram showing an example of a seed drill according to a fourth embodiment of the present invention.

[0036] Fig. 9 yes Figure 8 A side view of a planter is shown.

[0037] Fig.10 This is a diagram showing an example of a seed drill according to a fifth embodiment of the present invention.

[0038] Fig.11 yes Fig.10 A side view of a planter is shown.

[0039] Fig.12 This is a diagram showing an example of a seed drill according to a third embodiment of the present invention.

[0040] Fig.13 yes Fig.12 A side view of a planter is shown.

[0041] Fig.14 This is a diagram for explaining the state after the entire farmland is sown regularly.

[0042] Fig.15 This is a diagram for explaining a state in which seeds are not sown regularly over the entire farmland.

[0043] Fig.16 It is a figure which shows an example of the sowing machine which concerns on the 7th Embodiment of this invention.

[0044] Fig.17 yes Fig.16 A side view of a planter is shown.

[0045] Fig.18 This is a diagram showing an example of the structure of a portable terminal. DETAILED DESCRIPTION

[0046] Hereinafter, an embodiment of the present invention will be described. The sowing machine involved in the embodiment of the present invention is configured to travel using the groove-shaped ruts, waterways (open channels) formed on the farmland in the flooded state, the ribs formed on the farmland by the previously known markers, the linear grooves, the flexible linear bodies pre-stretched on the farmland in a straight line, etc. as the approximate target of the driving position in the farmland. That is, it is configured to travel using it as a guide. In addition, the sowing machine involved in the embodiment of the present invention is configured to sow seeds while traveling along the guide on the farmland in the flooded state. Specifically, the above-mentioned sowing machine has wheels configured to be able to travel on the farmland in the flooded state, a base supported by the wheels, a sowing device arranged on the base and configured to sow seeds on the farmland along the travel direction, and a position detection device that detects the driving position of the sowing machine relative to the guide in the left and right directions as the main components. That is, the sowing machine involved in the embodiment of the present invention is configured to travel while detecting the driving position relative to the guide at the current time point in the left and right directions while traveling on the farmland in the flooded state. It should be noted that the above-mentioned sowing machine can be any one of a power type having a driving force source for outputting power for traveling and a manual type without a driving force source. In addition, the above-mentioned wheel configured to be able to travel on farmland in an irrigated state is not limited as long as it can travel on a paddy field.

[0047] (First Embodiment)

[0048] (planter)

[0049] Figure 1 This is a diagram showing an example of a seed drill according to the first embodiment of the present invention. Figure 1 The sowing machine 1 shown is a manual four-wheel type sowing machine 1, and left and right front wheels 3R, 3L are provided on the front side of the base 2 in the traveling direction of the sowing machine 1, and left and right rear wheels 4R, 4L are provided on the rear side of the base 2 in the traveling direction. The base 2 is supported by these wheels 3R, 3L, 4R, 4L, and a sowing device 5 is provided on the base 2. It should be noted that the sowing machine 1 may also have a driving force source for generating a driving force for traveling. In addition, a steering device not shown in the figure may be provided at the rear of the sowing machine 1, and the traveling direction of the sowing machine 1 can be changed by the operator operating the steering device. However, if the traveling direction of the sowing machine can be controlled even without a steering device, a special steering device such as a steering wheel is not necessary.

[0050] The seeder 5 can be a known seeder in the past. Figure 1In the example shown, the seeder 5 is preferably configured to work in conjunction with the rotation of the front wheels 3R, 3L and the rear wheels 4R, 4L when the seeder 1 is traveling on the farmland, and to perform any of spot sowing, row sowing and scattering. Specifically, the seeder 5 can be, for example, the following drum seeder: the inside of a cylindrical container not shown is filled with seeds, and the seeds are sown at a constant interval by dropping them from holes formed through the plate thickness direction of the container. Alternatively, the seeder 5 can also be the following spreader: a storage portion for seeds not shown is provided, and the seeds supplied from the storage portion are sown by the rotation of a rotating body (not shown). Moreover, the seeder 5 can also be a seeder that is provided with a meter not shown and is configured to sow the seeds measured by the meter to the farmland. Alternatively, the seeder 5 can also be a seeder that is configured to sow seeds to the farmland using magnetic force, centrifugal force, etc. In addition, the seeder 5 may be a seeder that has a motor (not shown) and is not linked to the wheels 3R, 3L, 4R, 4L but can freely control the timing of sowing by the motor. The seeder 5 only needs to be configured to sow seeds on the farmland in conjunction with the travel of the seeder 1 when the seeder 1 is traveling on the farmland.

[0051] The number of on-demand and strip broadcasts is shown in Table 1 for the sake of simplicity. Figure 1 In the figure, 2 lines are shown, but of course, a device structure with more than 2 lines can be used. For example, 3 to 20 lines. As long as there is no problem in operation, it is fine even if there are more than 20 lines, which is within the scope of the present invention. There is no particular limitation on the spread range, as long as there is no problem in operation, it is fine even if it is about 0.1 meters to 10 meters.

[0052] (Position detection device and support mechanism)

[0053] A position detection device 6 configured to engage with the above-mentioned guide is provided on the front side of the base 2 in the traveling direction of the seed drill 1. Figure 1 In the example shown, the position detection device 6 is configured in a rod shape and is supported on the base 2 via a supporting mechanism. The supporting mechanism includes a first arm portion 7 protruding from the approximately central portion of the front end portion of the base 2 toward the front of the planter 1 and a second arm portion 8 extending to the left from the top end portion of the first arm portion. The protruding length of the first arm portion 7 from the front end portion of the base 2 in the traveling direction is set to a length at which one end of the first arm portion 7 (hereinafter referred to as the top end portion of the first arm portion 7) is located forward of the front wheels 3R ​​and 3L. The other end of the first arm portion 7 in the longitudinal direction is integrally connected to the base 2 by a connecting means. The connecting means may be any conventionally known connecting means, such as an adhesive, welding, rivet fastening, bolt fastening, etc. At the top end portion of the first arm portion 7, one end of the second arm portion 8 in the longitudinal direction is connected in a manner that allows rotation with the axis of the first arm portion 7 as the rotation center axis.

[0054] When the operator is located behind the sowing machine 1 and controls the traveling direction of the sowing machine 1, it is preferred to configure the position detection device 6 on the front side of the sowing machine 1 because it is easy to grasp the driving position of the sowing machine 1. However, as long as the driving position of the sowing machine 1 can be grasped, it does not matter where the position detection device 6 is installed. For example, even if the position detection device 6 is installed behind the operator, it is within the scope of the present invention if it is configured so that the deformation amount of the position detection device 6 described later can be grasped using a rearview mirror, a camera, a position sensor, etc.

[0055] In addition, when the sowing machine 1 is turned back without turning back and traveling, it is sufficient to position the first arm 7 on one side in the width direction of the base 2. Therefore, it is not necessary to be able to turn left and right.

[0056] exist Figure 1 In the example shown, the second arm 8 is oriented to the left relative to the travel direction of the seed drill 1 (in Figure 1 In the example shown here, the length of the second arm 8 in the left-right direction relative to the traveling direction of the seed drill 1 or the width direction of the seed drill 1 is set to a length at which the other end of the second arm 8 (hereinafter referred to as the top end of the second arm 8) and the left front wheel 3L and the left rear wheel 4L are at approximately the same position in the left-right direction. It should be noted that as long as the driving position can be grasped, the second arm 8 may also be a length greater than or less than the above-mentioned set length. The length of the second arm 8 is set to a length at which the position detection device 6 installed on the second arm 8 can engage with the guide when driving using the ruts, ribs, etc. as guides, that is, a length at which the position detection device 6 can obtain the guide in the left-right direction.

[0057] exist Figure 1 In the example shown, a rod-shaped position detection device 6 is connected to the top end of the second arm 8 in a state extending in the traveling direction so as to be rotatable with the axis of the second arm 8 as the rotation center axis and selectively fixable. For example, one end of the position detection device 6 is connected to the top end of the second arm 8 via a joint that can rotate with the arm 8 as an axis. In addition, the other end of the position detection device 6 (hereinafter referred to as the top end) is arranged below the one end of the position detection device 6 in the up-down direction of the seed drill 1 in a manner that engages with the ruts, ribs, waterways, grooves, etc. that function as guides. That is, the position detection device 6 is mounted on the second arm 8 in a manner that is inclined downward from the front to the rear in the traveling direction. The shape of the top end of the position detection device 6 is configured to fit into the inner side of the ruts, ribs, waterways, grooves, etc.

[0058] Here, the rigidity of the position detection device 6 and the rigidity of each arm 7, 8 are described. In the first embodiment, the rigidity of the position detection device 6 is set to a rigidity that is bent and deformed in the left and right directions according to the amount of movement of the planter 1 in the left and right directions when the top end of the position detection device 6 is engaged with the guide. In contrast, each arm 7, 8 as a supporting mechanism supports the position detection device 6, so the rigidity of each arm 7, 8 is set to be higher than the rigidity of the position detection device 6. It should be noted that rigidity means the degree of difficulty in deformation.

[0059] As raw materials or materials constituting the position detection device 6, for example, natural raw materials such as bamboo, reed, and wood, synthetic resin materials, metal wires, etc. can be cited. In addition, since the top end of the position detection device 6 moves along the guide member in a state of being engaged with the guide member, the position detection device 6 can also be composed of materials with excellent wear resistance and sliding properties. As materials with excellent wear resistance and sliding properties, for example, polyolefins such as ultra-high molecular weight polyethylene, polyoxymethylene, polyamide, synthetic resin materials containing fluororesins such as PTFE, polyphenylene sulfide, polyetheretherketone, polyester, polyurethane, phenolic resin and their composite materials can be cited. The position detection device 6 can be composed of any of the above-mentioned raw materials and materials, but natural raw materials such as bamboo, reed, and wood are preferred in terms of ease of acquisition. In addition, the metal wire can be any metal wire that can be flexed and deformed, such as piano wire.

[0060] Examples of the raw materials or materials constituting the first arm 7 and the second arm 8 include metal materials, wood, and resin materials. The first arm 7 and the second arm 8 may be made of raw materials or materials that are less likely to bend and deform than the raw materials or materials constituting the position detection device 6 .

[0061] (Guide)

[0062] As for the guide, as an example, groove-shaped ruts, waterways (open channels), ribs formed on farmland by previously known markers, etc. formed on farmland in a flooded state can be cited. They are preferably formed after the farmland in a flooded state is harrowed and the soil surface is hardened to a certain extent. By doing so, the strength of the grooves, ruts, waterways, etc. can be improved to a certain extent, and it is easy to trace them using the position detection device 6. In other words, it is easy to keep the state of being engaged with the guide. In addition, a waterway for drainage can be formed on the farmland as designed. If a waterway and a groove are formed on the farmland before harrowing and the land is harrowed afterwards, the waterway and groove formed before harrowing also function as a waterway and groove after harrowing, then the groove and waterway can also be formed before harrowing. As other examples of guides, ridges, tracks, etc. can be used. In addition, a flexible linear body pre-stretched on the farmland in a straight line such as a rope can be used. Regarding the guide, the effect can be obtained by using only one form, but the same effect can be expected by combining guides of different forms, for example, combining a groove and a rope, and this is within the scope of the present invention.

[0063] These guides are preferably located near the planter 1, and may be located at a position separated by a width of more than the wheel of the planter 1. For example, the second arm 8 may be relatively long, and not only the ruts immediately before the planter, but also the ruts and grooves when the planter is traveling 2, 3, or more ahead may be used as guides, which is within the scope of the present invention. In addition, the position detection device 15 may be a movable mechanism, and the planter may travel multiple times in a state where the position information can be confirmed even if the linear body is fixed, which is within the scope of the present invention.

[0064] The period of harrowing the irrigated farmland until the soil is compacted and the soil surface hardens to a certain extent can be determined through experiments and experience. The above-mentioned grooves, ruts, waterways, etc. formed on the soil surface of the farmland are preferably straight lines, but the shapes of the grooves, ruts, waterways, etc. are not limited. In the cultivation of seeds, it is essentially important to unify the sowing intervals. Therefore, if the sowing intervals are uniform, for example, the grooves, ruts, waterways, etc. can also be replaced by appropriate shapes such as partially curved shapes, winding shapes, and serrated shapes instead of straight lines. It should be noted that the strength of the grooves, ruts, waterways, etc. means the degree to which they are not easily damaged.

[0065] (seed)

[0066] As the seed used in the embodiment of the present invention, rice is preferred. There is no limitation on the variety of rice, and any of japonica rice, indica rice, and Java rice can be used. Rice is often cultivated in paddy fields in hot and humid areas, so the effect of the present invention can be exerted. In addition, if seeds sown in a flooded state are used instead of rice, any type of seeds can be preferably used.

[0067] As the above-mentioned seeds, it is preferred that the seeds (in the following description, referred to as coated seeds) are coated with a seed coating agent to increase the specific gravity compared to the seeds in a dry state that are not coated with the seed coating agent. This is because the coated seeds can be sunk into water in a irrigated farmland and the loss of the coated seeds can be suppressed. There is no restriction on the seed coating agent that increases the specific gravity of the seeds, but it is preferably a seed coating agent with a higher specific gravity than the seeds. For example, it is preferred to use a seed coating agent containing metal materials such as iron (Fe), silicon (Si), magnesium (Mg), calcium (Ca), aluminum (Al), manganese (Mn), copper (Cu), zinc (Zn), phosphorus (P), molybdenum (Mo) or a high specific gravity material.

[0068] As a seed coating agent, from the viewpoint of the effect of increasing the specific gravity of the seeds and the influence of the seed coating agent on the soil, a seed coating agent mainly containing an iron material is preferred. In an embodiment of the present invention, coated seeds referred to as iron-coated seeds can be preferably applied. Examples of the iron material include iron oxide, iron powder, iron slag, and the like. In addition, the seed coating agent can also be a seed coating agent composed of one or more of the above-mentioned metal materials and high specific gravity materials.

[0069] The specific gravity of the dry seeds without the seed coating agent is 1.1 g / cm 3 The specific gravity of the iron-coated seeds is preferably 0.1 g / cm higher than the specific gravity of the dry seeds not coated with the seed coating agent. 3 Specifically, the specific gravity of the iron-coated seeds is preferably 1.2 g / cm 3 More preferably, 1.3 g / cm 3 This is to prevent the coated seeds from being buried in the mud and being located near the soil surface when sowing in a flooded farmland, and to prevent the coated seeds from being lost from the farmland. In addition, this enables the iron-coated seeds to germinate and grow at the sowing location. There is no upper limit on the specific gravity of the iron-coated seeds, but it is preferably 4.0 g / cm 3 This is to suppress the increase in material cost associated with the increase in the amount of seed coating agent used and to suppress the burial of coated seeds in the mud due to the increase in the specific gravity of the seeds.

[0070] (Method for producing coated seeds)

[0071] There is no limitation on the method of coating seeds with the above-mentioned iron material. For example, as shown in "Iron Coating Water Direct Seeding Manual 2010 (Compiled by Kinki Chugoku Shikoku Agricultural Research Center, Independent Administrative Institution Agriculture and Food Industry Technology Comprehensive Research Institute)", it can be coated by hand or by any method such as using a conventionally known mixer.

[0072] When using a mixer to coat the seed coating agent, as the mixer, a stirring blade type mixer and a container rotating type mixer can be used. In addition, a concrete mixer having removed a stirring blade can also be preferably used as a mixer. As a stirring blade type mixer, for example, a Henschel mixer and a concrete mixer can be cited. As a container rotating type mixer, for example, a V-type mixer, a double cone mixer, an inclined rotating disk type mixer, a rotating tower type mixer, etc. can be cited.

[0073] As a specific method of coating seeds with a seed coating agent, seeds, iron powder as an iron material, iron oxide powder, calcined gypsum as a binder, polyvinyl alcohol-based resin, silica gel as an additive, a seed treatment agent, and a fertilizer component are appropriately put into a mixer and mixed. In addition, a method of coating the seeds while spraying water or a treatment liquid mainly composed of water can be cited. The same method can also be applied when other materials with a larger specific gravity than the seeds are used to coat the seeds. As other materials, for example, iron oxide, iron slag, and materials containing calcium can be cited. In addition, a treatment method such as hardening it with rust or hardening it with an adhesive such as resin or lime can also be applied.

[0074] (effect)

[0075] The function of the seed drill 1 involved in the first embodiment is explained. The farmland in the irrigated state is harrowed to level the soil surface. Then, after the soil is compacted and the soil surface becomes hard to a certain extent, for example, the seed drill 1 is driven along grooves such as ridges or open channels formed around the farmland. That is, the seed drill 1 is driven using the ridges or grooves as guides. As a result, groove-shaped ruts are formed on the farmland. In addition, as the seed drill 1 travels, iron-coated seeds are sown by the seeder 5 along the direction of travel of the seed drill 1.

[0076] After the sowing machine 1 has traveled a predetermined distance, the sowing machine 1 is reversed by a steering device (not shown) to turn around. In order to avoid sowing again at the position where the sowing machine 1 was sown before turning around, the position where the sowing machine 1 travels is shifted by the lateral width of the sowing machine 1 relative to the travel track of the sowing machine 1 before turning around. In addition, at this time, the travel track before turning around and the planned travel track after turning around are overlapped by the width of the wheels. This is to make the position detection device 6 engage with the rut formed by the travel before turning around.

[0077] As described above, the planter 1 is adjacent to the running track before the turnaround and can run along the running track before the turnaround. Furthermore, the top end of the position detection device 6 is pressed against and engaged with the rut formed by the running before the turnaround. The rigidity of the position detection device 6 is lower than the rigidity of the arms 7 and 8 of the position detection device 6. Therefore, if the top end of the position detection device 6 is pressed against the rut, Figure 2As shown, the convex shape is curved toward the front in the direction of travel. Figure 1 and Figure 2 The state shown is such that the seed drill 1 is in motion.

[0078] When the planter 1 is traveling along the rut, that is, when the planter 1 is traveling along the guide, the position detection device 6 extends along the guide and the traveling direction of the planter 1, and the position detection device 6 is hardly flexed and deformed in the left-right direction relative to the traveling direction. Alternatively, as described later, the deformation amount of the position detection device 6 in the left-right direction becomes smaller than when the planter 1 moves in the left-right direction.

[0079] For example, if the planter 1 moves to the right relative to the guide (track) in the traveling direction, one end of the position detection device 6 moves to the right as one with the planter 1. As described above, the top end of the position detection device 6 is pressed against and engaged with the track, so that this state is maintained. Alternatively, even if the top end of the position detection device 6 moves slightly to the right, the top end contacts the edge portion or side wall portion rising from the bottom of the track, thereby preventing or inhibiting further movement to the right.

[0080] As a result, the position detection device 6 becomes a cantilever beam, and a bending moment corresponding to the rightward movement of the planter 1 is generated in the position detection device 6. Due to this bending moment, the position detection device 6 is bent and deformed in a manner convex in the direction (left side) opposite to the moving direction (right side) of the planter 1. Figure 3 This state is shown. The amount of deformation of the flexural deformation of the position detection device 6 changes according to the amount of movement of the planter 1 in the left-right direction. That is, if the displacement of the travel position of the planter 1 relative to the guide in the left-right direction increases, the above-mentioned bending moment increases and the amount of deformation of the position detection device 6 increases. In contrast, if the displacement decreases, the bending moment decreases and the amount of deformation of the position detection device 6 decreases. The amount of deformation of the position detection device 6 can be confirmed, for example, by visual observation.

[0081] Then, after traveling a predetermined distance on the farmland, the direction of the seed drill 1 is reversed again in the same manner as described above. Since the first arm 7 of the position detection device 6 is rotatably connected to the second arm 8, the first arm 7 is rotated with the axis of the second arm 8 as the rotation center axis so that the position detection device 6 is located on the opposite side in the width direction of the seed drill 1. Then, the top end of the position detection device 6 is pressed against and engaged with the rut formed by the travel before the turnaround, and the seed drill 1 is driven in this state to sow seeds.

[0082] Thus, according to the embodiment of the present invention, the driving position of the seed drill 1 at the current time point in the left-right direction relative to the guide can be easily grasped based on the deformation amount of the position detection device 6. Therefore, the driving position can be quickly corrected, and the seed drill can be driven along the guide. In addition, since the position detection device 6 is exposed from the water surface, it is easy to confirm that the seed drill can be driven along the guide even when mud is rolled up due to driving on flooded farmland, making it difficult to confirm ruts. As a result, it is possible to prevent or suppress re-seeding at a position that has already been sown, and it is possible to prevent or suppress the generation of a portion of farmland that is not sown, and it is possible to sow at a specified position.

[0083] (Second Embodiment)

[0084] Figure 4 This is a diagram showing an example of a seed drill according to a second embodiment of the present invention. Figure 5 yes Figure 4 A side view of a planter is shown. Figure 4 and Figure 5 The seed drill 9 shown is a manual three-wheeled seed drill, and a front wheel 3 is provided on the front side of a base 2 in the traveling direction of the seed drill 9, and left and right rear wheels 4R and 4L are provided on the rear side of the base 2 in the traveling direction. The base 2 is supported by these wheels 3, 4R, 4L, and a seed drill 5 is provided on the base 2. The other structures are similar to Figure 1 The structures shown are the same, so the labels are the same as Figure 1 The same reference numerals are used and the description thereof is omitted. The operation of the second embodiment will be described together with the operation of the third embodiment.

[0085] (Third Embodiment)

[0086] Figure 6 This is a diagram showing an example of a seed drill according to a third embodiment of the present invention. Figure 7 yes Figure 6 A side view of a planter is shown. Figure 6 and Figure 7 The seed drill 10 shown is a manual two-wheeled seed drill, and wheels 11R and 11L are respectively provided on the left and right sides of the base 2 in the traveling direction of the seed drill 10. The base 2 is supported by the wheels 11R and 11L, and the seed drill 5 is provided on the base 2. Figure 1 The structures shown are the same, so the labels are the same as Figure 1 The same reference numerals are used and description thereof is omitted.

[0087] (Functions of the Second and Third Embodiments)

[0088] Even the seed drills 9 and 10 involved in the second and third embodiments, in the irrigated farmland after harrowing, the seed drills 9 and 10 are first driven along grooves such as ridges or open channels to form ruts. After driving a specified distance, the direction of the seed drills 9 and 10 is reversed by operating the steering device and the like in the same way as in the first embodiment, and the driving position is shifted by the width of the seed drills 9 and 10. Then, the position detection device 6 is pressed against and engaged with the ruts formed by the driving before the turnaround, and in this state, the seed drills 9 and 10 are driven on the farmland. Figure 4 , Figure 6 In the figure, regarding the reversal of the seed drills 9 and 10, a method of turning the seed drills 9 and 10 back is shown, but a method of turning back and moving backward is also possible.

[0089] When the sowing machines 9 and 10 are traveling along the ruts, that is, along the guide, the position detection device 6 extends along the guide and the traveling direction of the sowing machines 9 and 10, and the position detection device 6 does not bend and deform in the left and right directions relative to the traveling direction. Alternatively, the deformation amount of the position detection device 6 in the left and right directions is smaller than when the sowing machine 1 moves in the left and right directions. On the other hand, if the sowing machines 9 and 10 move in the left and right directions relative to the guide, the position detection device 6 bends and deforms according to the above-mentioned principle. The deformation amount of the position detection device 6 changes according to the movement amount of the sowing machines 9 and 10 in the left and right directions, so it is possible to easily grasp the travel position of the sowing machines 9 and 10 at the current time point in the left and right directions relative to the guide based on the deformation amount of the position detection device 6. As a result, the travel position of the sowing machines 9 and 10 can be corrected so that the sowing machines 9 and 10 can travel along the guide. In this way, even in the second and third embodiments, the same action and effect as the first embodiment can be obtained.

[0090] (Fourth Embodiment)

[0091] Figure 8 This is a diagram showing an example of a seed drill according to a fourth embodiment of the present invention. Fig. 9 yes Figure 8 The example shown here is an example in which the rigidity of the position detection device 6 is increased compared to the rigidity of the position detection device 6 of the first embodiment to the third embodiment and the position detection device 6 can be swung in the left-right direction along with the movement of the planter 12 in the left-right direction. Specifically, Figure 8 and Fig. 9The position detection device 6 shown is made of the same metal material as the arm portions 7 and 8. Therefore, compared with the position detection device 6 of the first to third embodiments, the position detection device 6 of the fourth embodiment is not easily flexed and deformed. In addition, one end of the position detection device 6 is connected to the top end of the second arm portion 8 in a manner that allows it to swing in the left and right directions. The position detection device 6 only needs to be connected to the second arm portion 8 in a manner that allows it to swing in the left and right directions. For example, the top end of the second arm portion 8 and one end of the position detection device 6 are connected via a universal joint, a hook joint, a ball joint, etc. It should be noted that in Figure 8 and Fig. 9 A two-wheeled planter 12 is shown in the figure, but a three-wheeled planter or a four-wheeled planter may be used instead. Figure 1 The structures shown are the same, so the labels are the same as Figure 1 The same reference numerals are used and description thereof is omitted.

[0092] (Function of the Fourth Embodiment)

[0093] In the irrigated farmland after harrowing, first, the seeder 12 is driven along grooves such as ridges or open channels to form ruts. After driving a specified distance, the direction of the seeder 1 is reversed by operating the steering device and the like in the same manner as in the first to third embodiments, and the driving position is shifted by the width of the seeder 1. Then, the top end of the position detection device 6 is pressed against and engaged with the ruts formed by the driving before turning back, and in this state, the seeder 12 is driven on the farmland. The rigidity of the position detection device 6 of the fourth embodiment is greater than that of the position detection device 6 of the first to third embodiments. Therefore, even if the top end of the position detection device 6 is pressed against the ruts, the position detection device 6 will hardly bend or deform.

[0094] When the seed drill 1 is traveling along the wheel track, that is, the guide, the position detection device 6 extends along the traveling direction of the seed drill 12, and the position detection device 6 does not swing in the left-right direction relative to the traveling direction. Alternatively, as described later, the swing angle range of the position detection device 6 in the left-right direction becomes a smaller angle range than when the seed drill 1 moves in the left-right direction. Therefore, on a plane parallel to the farmland, the angle θ formed by the position detection device 6 and the second arm 8 is maintained approximately constant. In the fourth embodiment, it is maintained at approximately 90 degrees. In this way, the angle θ formed by the position detection device 6 and the second arm 8 on the plane when the seed drill 12 is traveling along the guide is set as a reference angle θ0.

[0095] On the other hand, if the planter 12 moves in the left-right direction relative to the guide, one end of the position detection device 6 becomes one with the planter 12 and moves in the left-right direction. In contrast, the top end of the position detection device 6 maintains a state of being pressed against and engaged with the rut. One end of the position detection device 6 is connected to the top end of the second arm 8 in a manner that allows it to swing in the left-right direction. Therefore, with the movement of the planter 12 in the left-right direction, the angle θ formed by the position detection device 6 and the second arm 8 changes from the above-mentioned reference angle θ0. Specifically, as Figure 8 As shown, when the seed drill 12 moves away from the wheel track, the angle θ becomes larger than the reference angle θ0. On the other hand, when the seed drill 12 moves in the left-right direction so as to approach the wheel track, the angle θ becomes smaller than the reference angle θ0.

[0096] The amount of change of such an angle θ relative to the reference angle θ0 changes according to the amount of movement of the planter 12 in the left-right direction. Therefore, the travel position of the planter 12 at the current time point relative to the guide in the left-right direction can be easily grasped based on the angle θ formed by the position detection device 6 and the second arm 8. As a result, the planter 12 can be driven along the guide as in the first to third embodiments. In this way, even in the fourth embodiment, the same action and effect as in the first to third embodiments can be obtained.

[0097] (Fifth Embodiment)

[0098] Fig.10 This is a diagram showing an example of a seed drill according to a fifth embodiment of the present invention. Fig.11 yes Fig.10 A side view of a planter is shown. Fig.10 and Fig.11 The example shown is an example in which a flexible linear body 14 pre-stretched on a watered farmland is used as a guide and the seed drill 13 is caused to travel along the linear body 14. Specifically, Fig.10 and Fig.11 The seeder 13 shown is a manual two-wheel type seeder, and position detection devices 15 are respectively provided at the central parts in the width direction of the front end and the rear end of the base 2 of the seeder 1. The position detection device 15 shown here is configured as a plate as an example. A gap is formed in the plate, which is substantially the same as the outer diameter of the linear body 14 or slightly wider than the outer diameter of the linear body 14. The linear body 14 is configured to engage with the gap in a relatively movable manner. Fig.11 In the embodiment, the linear body 14 is lifted by the position detection device 15 , but it may also be a form in which the linear body 14 is located slightly above the position detection device 15 and is stretched in a straight line without contacting the position detection device 15 .

[0099] The position detection device 15 may be fixed to the base 2 or may be configured to be movable in the width direction (left-right direction) of the base 2 . Fig.10 and Fig.11 The case where the position detection device 15 is fixed to the base 2 is shown. When the position detection device 15 is fixed to the base 2, the relative position of the seed drill 13 with respect to the guide can be grasped by using the bending angle of the linear body 14. In addition, when the position detection device 15 is configured to be movable in the width direction (left-right direction) of the base 2, the relative position of the seed drill 13 with respect to the guide can be grasped by reading the displacement in the left-right direction relative to a preset reference position or initial position. The seed drill 13 is an example of the fifth embodiment, and the position detection device 15 is installed on the drum seed drill 5. It should be noted that the handle for operating the drum seed drill is omitted for simplicity.

[0100] The linear body 14 is preferably straightened by applying tension, and there is no limitation on the raw material constituting the linear body 14 if it is such a linear body 14. Examples of the raw material constituting the linear body 14 include ropes, cords, belts, threads, fishing lines, fishing lines, resin lines, wire ropes, steel wires, and metal wires. The linear body 14 only needs to be straightened by tension, and therefore, it may be located above water or in water.

[0101] A plurality of linear bodies 14 may be arranged on the farmland at a predetermined sowing interval. Alternatively, a linear body 14 may be stretched in a straight line on the farmland, and the sowing machine 13 may be driven along the linear body 14 to sow. Thereafter, a linear body 14 may be stretched in a straight line on the farmland at a predetermined sowing interval, and the sowing machine 13 may be driven along the linear body 14 to sow. This may be repeated. There is no limit to the number of linear bodies 14 stretched on the farmland.

[0102] (Function of the Fifth Embodiment)

[0103] In the irrigated farmland after harrowing, at least one linear body 14 is stretched out in a straight line along the predetermined travel line for the seeder 13 to travel. The linear body 14 is passed through the gap of the position detection device 15 of the seeder 13, and in this state, the seeder 13 is driven along the linear body 14 to sow. After traveling a predetermined distance, the direction of the seeder 13 is reversed or the seeder 13 is turned back in the same manner as in the first to fourth embodiments, and the travel position is shifted by the width of the seeder 13. Then, the linear body 14 is stretched out in a straight line again in the farmland. The linear body 14 is passed through the gap of the position detection device 15 of the seeder 13, and in this state, the seeder 13 is driven along the linear body 14 to sow. This is repeated. It should be noted that the above-mentioned predetermined travel line means the forward route for the seeder 13 to travel.

[0104] When the planter 13 is traveling along the linear body 14, the linear body 14 on the front side and the linear body 14 on the rear side in the traveling direction of the planter 13 are both maintained in a straight line. Therefore, the linear body 14 does not deform in the left-right direction. Alternatively, as described later, the bending angle of the linear body 14 is smaller than when the planter 1 moves in the left-right direction.

[0105] like Fig.10 and Fig.11 As shown, the case where the position detection device 15 is fixed to the base 2 is described. If the planter 13 moves to one side in the left-right direction, the portion of the linear body 14 that passes through the slit of the position detection device 15 becomes one with the planter 13 and moves to one side in the left-right direction. Therefore, the linear body 14 bends with the slit of the position detection device 15 as an inflection point. On a plane parallel to the farmland, the bending angle of the linear body 14 changes according to the movement amount of the planter 13 in the left-right direction, and gradually becomes smaller with the increase in the movement amount of the planter 13 in the left-right direction. In other words, the bending of the linear body 14 becomes larger. Such a bending angle of the linear body 14 is confirmed by visual inspection. In addition, in the case of forming a form in which the linear body 14 is located slightly above the position detection device 15 and is stretched in a straight line without contacting the position detection device 15, the linear body 14 is used as a mark, and the deviation of the position detection device 15 from the linear body 14 in the left-right direction is confirmed by visual inspection.

[0106] The case where the position detection device 15 is configured to be movable in the width direction (left-right direction) of the base 2 is described. If the planter 13 moves to one side in the left-right direction, the position detection device 15 moves relative to the reference position. The relative position of the planter 13 relative to the linear body 14 as the predetermined travel line can be grasped by the displacement of the position detection device 15 relative to the reference position. In addition, by changing the forward route of the planter 13 in such a way that the position detection device 15 returns to the reference position, the planter 13 can be returned to the predetermined travel line.

[0107] Therefore, the travel position of the planter 13 at the current time point relative to the predetermined travel line in the left-right direction can be easily grasped based on the bending angle of the linear body 14, the offset of the position detection device 15 in the left-right direction from the linear body 14, and the displacement of the position detection device 15 relative to the reference position. As a result, the planter 13 can be driven in the same manner as in the first to fourth embodiments. In this way, even in the fifth embodiment, the same action and effect as in the first to fourth embodiments can be obtained.

[0108] It should be noted that considerable tension is required to stretch the linear body 14 in a straight line over a wide farmland, and ropes or the like as guides are easily bent. Therefore, the interval at which the linear body 14 is stretched, that is, the length of the linear body 14 in a straight line state, may be appropriately adjusted, or a relay portion may be provided to suppress the bending of the linear body 14. Thus, the tension for stretching the linear body 14 in a straight line state can be reduced, and the bending of the linear body 14 can be suppressed.

[0109] (Sixth Embodiment)

[0110] Fig.12 It is a figure which shows an example of the seed drill which concerns on the 6th embodiment of this invention. Fig.13 yes Fig.12 A side view of a planter is shown. Fig.12 and Fig.13 The seeder 16 shown is a manual two-wheeled seeder similar to the seeder 10 of the third embodiment. In the seeder 16, the handle 17 as a steering device is mounted on the base 2 and the seeder 5 in such a manner that the handle 17 is located on the front side in the front-rear direction of the seeder 16 or on the rear side in the front-rear direction. Specifically, Fig.12 and Fig.13 The handle 17 shown is in the shape of a rectangular ring, and the first side 17a of the four sides of the handle 17 extends in a direction substantially parallel to the width direction of the seeder 16. The first side 17a of the handle 17 is rotatably mounted relative to the base 2, the seeder 5, and the unillustrated rotating shaft of the wheel 11. For example, the handle 17 may be rotatably mounted on the base 2 via an unillustrated hinge. Alternatively, an unillustrated sleeve that is configured to leave a predetermined gap and arrange the rotating shaft of the wheel 11 on the inner side may be mounted on the rotating shaft, and the handle 17 may be mounted on the rotating shaft via the sleeve. Fig.12 and Fig.13 , an example in which a handle 17 is installed on the rotating shaft of the wheel 11 via a sleeve is shown. In the above-mentioned seed drill 16, the operator uses the second side 17b substantially parallel to the first side 17a of the handle 17 to push or pull the seed drill 16. It should be noted that in Fig.12 In the example shown, the planter 16 is pulled using the handle 17. Fig.12 In the figure, description of the seeder 5 is omitted, but the seeder 5 is a cylindrical member having holes formed therein and serving as the base 2, and is configured to store seeds and sow them.

[0111] One end of the second arm 8 in the longitudinal direction is fixed to the left end of the second side 17b of the handle 17 when viewed in the traveling direction of the planter 16. The second arm 8 extends in a direction substantially parallel to the width direction of the planter 16. The second arm 8 may be fixed to the handle 17 by conventionally known fixing means, such as adhesive, welding, rivet fastening, bolt fastening, etc. Figure 8 The structures shown are the same, so the labels are the same as Figure 8 The same reference numerals are used and description thereof is omitted.

[0112] (Function of the Sixth Embodiment)

[0113] In the irrigation state of the farmland after harrowing, first, the seed drill 16 is driven along the grooves such as ridges or open channels to form ruts. After driving for a predetermined distance, the seed drill 16 is temporarily stopped, such as Fig.13 As shown, the handle 17 is rotated toward the rear side in the travel direction with the rotation axis of the wheel as the rotation center. In addition, the travel position is shifted by the width of the planter 16, and the position detection device 6 is pressed against and engaged with the ruts formed by the travel before the handle 17 is turned (hereinafter referred to as immediately before). Then, the planter 16 is driven in the direction opposite to the travel direction of the planter 16 immediately before the handle 17 is turned. That is, Fig.12 In the example shown, the seed drill 16 is turned back.

[0114] When the sowing machine 16 is traveling along the rut, that is, along the guide, the interval between the position detection device 6 and the guide is approximately constant, and the position detection device 6 extends along the guide and the traveling direction of the sowing machine 16. In other words, the position detection device 6 does not bend and deform in the left and right directions relative to the traveling direction. Or, the deformation amount of the position detection device 6 in the left and right directions is smaller than when the sowing machine 1 moves in the left and right directions. On the other hand, if the sowing machine 16 moves in the left and right directions relative to the guide, the position detection device 6 bends and deforms according to the above principle. The deformation amount of the position detection device 6 changes according to the movement amount of the sowing machine 16 in the left and right directions. Therefore, the driving position of the sowing machine 16 at the current time point in the left and right directions relative to the guide can be easily grasped based on the deformation amount of the position detection device 6. As a result, the driving position of the sowing machine 16 can be corrected so that the sowing machine 16 can travel along the guide. In this way, even in the sixth embodiment, the same action and effect as the above-mentioned embodiments can be obtained.

[0115] (Seventh Embodiment)

[0116] When the sowing machines 1, 9, 10, 12, 13, and 16 are driven along the guide, a slight deviation (hereinafter, sometimes referred to as an error or azimuth) may sometimes occur between the direction along the guide and the direction along the actual driving direction. In addition, the above-mentioned guide is not always constant, and is different each time the sowing machines 1, 9, 10, 12, 13, and 16 travel back and forth on the farmland. Therefore, if the sowing machines 1, 9, 10, 12, 13, and 16 travel back and forth on the farmland for many times, the above-mentioned errors will gradually accumulate, and it may not be possible to sow seeds regularly on the entire farmland. Here, sowing seeds regularly on the entire farmland means that the multiple rows formed by the seeds sown on the farmland are roughly parallel to each other. In addition, it means that the driving direction of the sowing machine when it first travels on the farmland (hereinafter, referred to as the reference direction) and the driving direction of the sowing machine when it travels on the farmland afterwards are roughly parallel to each other, that is, the angle formed by these driving directions, i.e., the azimuth, is less than a predetermined angle. As an example, the azimuth is preferably less than 6°, and more preferably less than 3°. For example, when the azimuth angle is 6° and the seeder has traveled 10m from the specified position, the distance between the line along the reference direction and the seeder, that is, the offset amplitude, becomes about 1.0m. When the azimuth angle is 3° and the seeder has traveled 10m from the specified position, the offset amplitude becomes about 0.5m. Therefore, in order to minimize the offset amplitude, the azimuth angle is preferably as small as possible. Therefore, it is preferred that the azimuth angle is as small as possible in order to sow seeds regularly throughout the farmland. It should be noted that the offset amplitude means the distance between the intersection of a line along the reference direction and a line that is orthogonal to the line along the reference direction and passes through a location where the seeder has traveled 10m from the specified position, and the location.

[0117] Specifically, Fig.14 This is a diagram for explaining the state after the seeding machine has been regularly sown on the entire farmland, and shows the direction in which the seeding machine travels when it travels back and forth on the farmland multiple times. Fig.14 In the example shown, the directions of the planter's travel when it travels back and forth multiple times on the farmland are approximately parallel to each other. That is, the azimuth angle formed by the planter's travel direction in the first reciprocating route, i.e., the reference direction D1, and the planter's travel direction D2 in the fifth reciprocating route is approximately 0°.

[0118] Fig.15 This is a diagram for explaining a state where the seeding machine is not regularly sowing seeds on the entire farmland, and shows the direction in which the seeding machine travels when it travels back and forth on the farmland multiple times. Fig.15 In the example shown, the directions of the planter's travel when it travels back and forth multiple times on the farmland are not approximately parallel to each other. That is, the azimuth angle formed by the planter's travel direction in the first reciprocating route, i.e., the reference direction D1, and the planter's travel direction D2 in the fifth reciprocating route is not approximately 0°.

[0119] Therefore, the seed drill involved in the seventh embodiment of the present invention is configured to obtain a signal from a positioning satellite of a satellite positioning system, and calculate the position (hereinafter referred to as position information) and azimuth of the seed drill based on the obtained signal. Furthermore, the driving position, that is, the driving direction of the seed drill can be corrected based on the above-mentioned position information and azimuth. Fig.16 It is a figure which shows an example of the sowing machine which concerns on the 7th Embodiment of this invention. Fig.17 yes Fig.16 A side view of a planter is shown. Fig.16 and Fig.17 The sowing machine 18 shown is a manual two-wheel type sowing machine having a structure similar to the sowing machine 16 of the sixth embodiment, and a bracket (not shown) is provided in the width direction at the center of the handle 17. A portable terminal 19 configured to obtain a signal from a satellite positioning system is installed on the bracket in a detachable manner. It should be noted that the portable terminal 19 is equivalent to the position information acquisition device in the present invention.

[0120] The satellite positioning system may be GPS (Global Positioning System) or GNSS (Global Navigation Satellite System). In addition to the positioning satellites used in GPS, GNSS also receives signals from positioning satellites used in other satellite positioning systems, thereby sometimes being able to obtain position information with higher accuracy than GPS, and is therefore preferred. In addition, the satellite positioning system may also be RTK (Real Time Kinematic, hereinafter referred to as GNSS-RTK) or DGPS (Differential Global Positioning System, hereinafter referred to as GNSS-DGPS) in GNSS. They have fixed stations that can receive signals from positioning satellites and are set on the ground and whose position coordinates are accurately known, and mobile stations that can receive signals from positioning satellites and are configured to be movable. Furthermore, the accuracy of the position information of the mobile station is improved by correcting the position information based on the signals from the positioning satellites received by the fixed station. When GNSS-RTK or GNSS-DGPS is used as the satellite positioning system, the portable terminal 19 attached to the handle 17 functions as a mobile station. Fig.16 and Fig.17 In order to simplify the drawings, the description of the position detection device 6 is omitted. Fig.13 The structure shown is the same, so Fig.13 The same structure as shown, marked with Fig.13 The same reference numerals are used and description thereof is omitted.

[0121] Fig.18 It is a diagram showing an example of the configuration of the portable terminal 19 . Fig.18 The portable terminal 19 shown includes a receiving unit 21, a control unit 22, a storage unit 23, a display unit 24, and an operating unit 25. The receiving unit 21 is configured to receive signals from a plurality of positioning satellites 20, and may be, for example, a conventionally known antenna. In order to obtain high-precision position information, it is preferred to use the receiving unit 21 to receive signals from a plurality of positioning satellites 20. Specifically, it is preferred to use the receiving unit 21 to receive signals from four or more positioning satellites 20. This is because by calculating the position at the current time point based on the position information based on the signals from the three positioning satellites 20 and the time received from the fourth positioning satellite 20, the difference between the calculated position at the current time point and the actual position can be reduced. The signal received by the receiving unit 21 is input to the control unit 22.

[0122] The control unit 22 is mainly composed of a microcomputer, and is configured to perform calculations based on input data, pre-stored data, and calculation expressions, and output the results. Fig.18 The control unit 22 shown performs calculations based on the signal received by the receiving unit 21 to calculate the position information, the travel track, the reference direction, and the azimuth of the seed drill 18 in the farmland.

[0123] The storage unit 23 is, for example, a part that stores various information calculated by the control unit 22. In addition, map information may be pre-stored in the storage unit 23. Regarding the map information, it may also be configured to obtain map information stored in a server connected to an Internet line via wireless communication. The display unit 24 is a part that displays various information and map information calculated by the control unit 22. By displaying the above-mentioned various information and map information on the display unit 24, the operator can visually confirm them. It should be noted that it is preferred to display the position information, driving trajectory, reference direction, and azimuth of the seed drill 18 in an overlapping manner on the map information. The display unit 24 may be a conventionally known monitor.

[0124] The operation unit 25 is configured to be operated by an operator to read out various information stored in the storage unit 23 and display the information on the display unit 24 .

[0125] (Function of the Seventh Embodiment)

[0126] In the farmland under watering, the operator drives the planter 18 along the guide which is set as the approximate destination of driving at the current time point. The portable terminal 19 receives signals from a plurality of positioning satellites 20, and calculates the position information, driving track, reference direction, and azimuth of the planter 18 at the current time point in the farmland based on the received signals. This information is stored in the storage unit 23 of the portable terminal 19 and displayed on the display unit 24. In addition, each information is updated every time a signal from a plurality of positioning satellites 20 is received. That is, the information stored in the storage unit 23 is updated, and the updated information is displayed on the display unit 24.

[0127] Therefore, even when the operator drives the seed drill 18 back and forth multiple times in a flooded farmland, the operator can always use the latest information to confirm whether the seed drill 18 is traveling in the reference direction. Furthermore, even if the displacement of the seed drill 18 in the left and right directions relative to the guide is a small displacement that does not cause a problem, when such displacement accumulates and the azimuth angle becomes larger than a predetermined angle, the handle 17 can be operated to correct the direction in which the seed drill 18 is traveling. As a result, the azimuth angle can be reduced as much as possible, and even if the seed drill 18 drives back and forth multiple times, the multiple rows formed by the seeds sown on the farmland can be made roughly parallel to each other. In this way, in the seed drill 18 of the seventh embodiment, compared with the seed drills 1, 9, 10, 12, 13, and 16 of the above-mentioned embodiments, even if the seed drill 18 drives back and forth multiple times on the farmland, it can be as described above. Fig.14 Sow seeds regularly over the entire field as shown.

[0128] In addition, the planter 18 of the seventh embodiment is provided with a position detection device 6. Therefore, even when it is difficult to receive a signal from the positioning satellite 20 due to, for example, bad weather, electromagnetic interference, or a malfunction of the portable terminal 19, the planter 18 can be driven along the guide to sow seeds at a predetermined position based on the deformation amount of the position detection device 6. In other words, substantially the same action and effect as the sixth embodiment can be obtained.

[0129] It should be noted that the present invention is not limited to the first to seventh embodiments described above. For example, in the first to third embodiments, the fifth, sixth, and seventh embodiments, the displacement of the driving position of the sowing machine 1, 9, 10, 13, 16, and 18 at the current time point relative to the predetermined driving line can be grasped by visual observation. Instead of this, it can also be configured to detect the deformation amount of the position detection device 6 and the linear body 14 using a strain sensor, a laser distance meter, etc. It can also be configured to issue a warning to the operator of the sowing machine 1, 9, 10, 13, 16, and 18 when the change amount of the position detection device 6 and the linear body 14 detected by the strain sensor, the laser distance meter, etc. exceeds a preset threshold. It can also be configured to urge the correction of the driving position of the sowing machine 1, 9, 10, 13, 16, and 18 by doing so. Alternatively, it can also be configured to control the steering device based on the change amount of the above-mentioned position detection device 6, and to automatically correct the driving position of the sowing machine 1, 9, 10, 13, 16, and 18.

[0130] In the fourth embodiment described above, the angle θ between the position detection device 6 and the second arm 8 may be detected by using a laser distance meter, an angle sensor, etc. When the angle θ detected by the laser distance meter, the angle sensor, etc. exceeds a preset threshold, a warning may be issued to the operator of the seed drill 12 to urge the correction of the driving position of the seed drill 12. Alternatively, the steering device may be controlled based on the above-mentioned angle θ to automatically correct the driving position of the seed drill 12.

[0131] In addition, the detection of the driving position by the above-mentioned position detection devices 6 and 15 and the detection of the driving position by strain sensors, laser distance meters, angle sensors, etc. can also be used together. For example, even when it is difficult to detect the laser of the laser distance meter on a sunny day, the driving position of the sowing machine 1, 9, 10, 12, 13, 16, 18 can be detected and grasped by using the position detection devices 6 and 15 involved in this embodiment. In addition, even when the strength of the rut is low and it is difficult to use the position detection device 6 of the first to fourth embodiments, the sixth embodiment, and the seventh embodiment to trace the rut, and it is difficult to make the position detection device 6 engage with the rut, the driving position can be detected by using the laser distance meter. As a result, compared with the case where the position detection device 6 is used alone, the detection accuracy of the driving position can be improved as a whole device, and the sowing machine 1, 9, 10, 12, 13, 16, 18 can be easily driven along the rut. In addition, the driving position can be detected while confirming the rut in the water using underwater box glasses, polarized glasses, etc. When the strength of the rut is low or the tension of the linear body 14 is low and it is difficult to detect the driving position by the position detection device 6, 15, and the transparency of the water in the farmland is high, the driving position can be detected by using underwater box glasses, polarized glasses, etc. Therefore, compared with the case where the position detection device 6, 15 is used alone, the detection accuracy of the driving position can be improved as a whole device, and the seed drill 1, 9, 10, 12, 13, 16, 18 can be easily driven along the rut.

[0132] Furthermore, when the seed drill 1, 9, 10, 12, 13, 16, 18 is provided with a driving force source, the driving force source may be a driving force source with a small driving force to the extent that the operator assists the operation of the seed drill 1, 9, 10, 12, 13, 16, 18. Even when the driving force generated by the driving force source is small, the labor load can be reduced. In addition, since a driving force source with a small driving force can be used, the cost involved in the driving force source can be reduced.

[0133] In the fifth embodiment, in order to engage the linear body 14 functioning as a guide with the position detection device 15 provided in the seed drill 13, the seed drill 13 can also be configured using a small ship, a hovercraft, an unmanned aerial vehicle, etc. that does not directly contact the soil surface. Even in the seed drill 13 of such a structure, by providing the position detection device 15 according to the embodiment of the present invention, the travel position of the seed drill 13 can be grasped based on the deformation amount of the linear body 14 or the displacement amount of the position detection device 15 relative to the base 2. Therefore, the same action and effect as the first to sixth embodiments can be obtained.

[0134] Example

[0135] Next, invention examples 1 to 17 and comparative examples 1 to 6 which were performed to confirm the effects of the seed drills 1, 9, 10, 12, 13, and 16 and the seeding method according to the present invention will be described.

[0136] (Invention Example 1)

[0137] Invention Example 1 is an example of using a four-wheeled seed drill and installing a position detection device having a configuration substantially similar to that of the position detection device 6 of the first embodiment. In addition, in order to form a flexible position detection device, the position detection device is configured as a rod made of ultra-high molecular weight polyethylene (described as a flexible rod in Table 1 described later). As rice seeds to be sown, a rod having a specific gravity of 1.5 g / cm 3 The iron-coated seeds are sown by driving the seeder with the above structure on the farmland in the irrigation state.

[0138] (Invention Example 2)

[0139] Inventive Example 2 is an example of using a two-wheeled seed drill and installing a position detection device having a configuration substantially similar to the position detection device 15 of the fifth embodiment. In addition, it is an example of performing spot seeding by driving the seed drill along a rope pre-installed on the farmland. The same rice seeds as those of Inventive Example 1 were used.

[0140] (Invention Example 3)

[0141] Invention Example 3 is an example of using a three-wheeled seed drill and installing a position detection device having a configuration substantially similar to the position detection device 6 of the first embodiment. In addition, it is an example of using a piano wire, that is, a high-tension steel wire to form the position detection device. The seed drill having the above-mentioned structure was driven on a farmland in a flooded state where shallow water management was performed and drainage was partially present, and iron-coated seeds were sown. The same rice seeds as those in Invention Example 1 were used.

[0142] (Invention Example 4)

[0143] Invention Example 4 is an example of using a two-wheeled seed drill and installing a position detection device having a configuration substantially similar to the position detection device 6 of the first embodiment. In addition, it is an example of using bamboo pieces to form the position detection device. As rice seeds, iron oxide-coated rice seeds with a specific gravity of 1.3 g / cm 3 The iron oxide coated seeds are sown by driving the seeder having the above structure on the farmland in the irrigation state.

[0144] (Invention Example 5)

[0145] Inventive Example 5 uses a reed as the position detection device 6 and uses a slag coated with iron slag and having a specific gravity of 1.2 g / cm 3The iron slag coated seeds were used as an example of rice seeds. In addition, the iron slag coated seeds were sown in the same manner as in Invention Example 4 on the farmland in the irrigation state.

[0146] (Invention Example 6)

[0147] Invention Example 6 is an example of using a two-wheeled seed drill and installing a position detection device having a configuration substantially similar to that of the position detection device 6 of the fourth embodiment in a manner that allows it to swing in the left-right direction. The position detection device is made of the same metal material as the arms 7 and 8 as an example. The same iron-coated seeds as those of the first embodiment are used as rice seeds, and the seed drill having the above-mentioned configuration is driven on a farmland in an irrigated state to sow the iron-coated seeds in rows.

[0148] (Invention Example 7)

[0149] Invention Example 7 is an example of using a two-wheeled seed drill and installing a position detection device having a configuration substantially similar to that of the position detection device 6 of the first embodiment. In addition, the position detection device is formed of polyoxymethylene resin. A specific gravity of 2.0 g / cm 3 The iron-coated seeds are used as rice seeds, and the iron-coated seeds are sown in rows using the seeder with the above structure.

[0150] (Invention Example 8)

[0151] Inventive Example 8 is a position detection device formed of a polyamide resin and using a specific gravity of 3.0 g / cm 3 The iron-coated seeds of were sown as rice seeds.

[0152] (Invention Example 9)

[0153] Inventive Example 9 is a method of using polyester resin to form a position detection device and using a polyester resin having a specific gravity of 4.0 g / cm 3 The invention is an example in which iron-coated seeds of are used as rice seeds and the iron-coated seeds are sown using a sowing machine configured in the same manner as in Invention Example 1. Other than this, the invention is the same as in Invention Example 7.

[0154] (Invention Example 10)

[0155] Inventive Example 10 is an example in which the position detection device is formed of polyethylene resin and iron-coated seeds are scattered on farmland. Other than this, the same procedures are used as in Inventive Example 1.

[0156] (Invention Example 11)

[0157] Inventive Example 11 is an example in which a fishing line is used as a guide instead of the rope of Inventive Example 2, and iron-coated seeds are sown on a farm. Other than this, the same procedures are followed as in Inventive Example 2.

[0158] (Invention Example 12)

[0159] Inventive Example 12 is an example in which a stainless steel wire is used as a guide instead of the fishing line of Inventive Example 11. Other than this, the invention is the same as Inventive Example 11.

[0160] (Invention Example 13)

[0161] Invention Example 13 is an example in which a position detection device having substantially the same configuration as the position detection device 15 of the fifth embodiment is installed on a small ship. Also, this is an example in which iron-coated seeds are scattered on the farmland using a wire rope previously installed on the farmland as a guide.

[0162] (Invention Example 14)

[0163] Invention Example 14 is an example of using a two-wheeled seeder and a drum seeder in the seeder having a handle having a structure substantially similar to the handle 17 described in the sixth embodiment. In addition, it is an example of installing a position detection device having a structure substantially similar to the position detection device 6 of the first embodiment on the handle. That is, it is an example of making the seeder fold back. The operator can confirm the status of the position detection device while pushing / pulling the handle backward. It is an example of simplification as a device structure. In addition, the position detection device is formed of ultra-high molecular weight polyethylene, and iron-coated seeds are sown in rows on the farmland as the seeder travels.

[0164] (Invention Example 15)

[0165] Invention Example 15 is an example of using a two-wheeled seed drill and installing a position detection device having substantially the same structure as the position detection device 6 of the first embodiment and a portable terminal using GNSS-RTK as a satellite positioning system. In addition, correction information for correcting the position information based on the signal received by the portable terminal is obtained from an Internet line connected by wireless communication. Furthermore, in order to form a soft position detection device, the position detection device is configured as a rod made of a synthetic resin material (represented as a soft rod in Table 1 described later). As rice seeds to be sown, a rod with a specific gravity of 1.5 g / cm 3 The above-mentioned seeder is driven on the farmland in the irrigation state to drill the iron-coated seeds.

[0166] (Invention Example 16)

[0167] Invention Example 16 is an example in which a portable terminal using GNSS-RTK as a satellite positioning system is installed on the seed drill of Invention Example 2. In addition, correction information for correcting the position information based on the signal received by the portable terminal is obtained from an Internet line connected by wireless communication. Other than this, it is the same as Invention Example 2.

[0168] (Invention Example 17)

[0169] Invention Example 17 is an example in which a portable terminal using GNSS-RTK as a satellite positioning system is installed on the seed drill of Invention Example 6. In addition, correction information for correcting the position information based on the signal received by the portable terminal is obtained from an Internet line connected by wireless communication. Other than this, it is assumed to be the same as Invention Example 6.

[0170] (Comparative Example 1)

[0171] Comparative Example 1 is an example in which a conventionally known rotary marker is installed on a four-wheeled seed drill and the seed drill is driven using the ribs formed on the farmland by the rotary marker as a guide to sow seeds. In addition, uncoated rice seeds not coated with the above-mentioned seed coating agent are used as rice seeds. Furthermore, the seed drill having the above-mentioned structure is driven on the farmland in a drained state to sow rice seeds.

[0172] (Comparative Example 2)

[0173] Comparative Example 2 is an example in which a two-wheeled seed drill is used and a rod having substantially the same rigidity as the arms 7 and 8 is attached to the top end of the second arm 8 of the seed drill so as not to swing in the left-right direction, and a wheel track is drawn by the rod. Rice seeds without covering are used as rice seeds, and the seed drill having the above structure is driven on a farmland in a drainage state to sow the rice seeds.

[0174] (Comparative Example 3)

[0175] Comparative Example 3 is an example in which a seed drill having the same structure as that of Comparative Example 1 was driven on a farmland in a flooded state to sow rice seeds.

[0176] (Comparative Example 4)

[0177] Comparative Example 4 used a 3 The iron-coated seeds of were used as examples of rice seeds. Other than this, the same procedures were followed as in Comparative Example 1.

[0178] (Comparative Example 5)

[0179] Comparative Example 5 uses a specific gravity of 1.5 g / cm 3 The example in which the iron-coated seeds of were used as rice seeds and the seeding machine constructed in the same manner as in Comparative Example 2 was driven on the farmland in the irrigated state to sow the rice seeds.

[0180] (Comparative Example 6)

[0181] Comparative Example 6 is an example of using a two-wheeled seed drill and installing a portable terminal using GNSS-RTK as a satellite positioning system. That is, Comparative Example 6 is an example in which the seed drill is not equipped with the above-mentioned position detection device. In addition, correction information based on the position information received by the portable terminal is obtained from the Internet line connected by wireless communication. As rice seeds to be sown, a specific gravity of 1.5 g / cm 3 The above-mentioned seeder is driven on the farmland in the irrigation state to drill the iron-coated seeds.

[0182] The coating of seeds with iron powder (powder coating) was carried out according to the method described in the above-mentioned "Iron Coating Water Direct Seeding Manual 2010". Materials other than iron powder (specifically, iron oxide, iron slag, etc.) were coated on the surface of rice seeds using a binder.

[0183] (Evaluation method and evaluation)

[0184] (Position accuracy)

[0185] The position accuracy is evaluated by the maximum displacement of the center line of the seeder in the left-right direction relative to the center axis of the rut or linear body when the seeder is driven for about 10 meters along the rut or linear body that functions as a guide. That is, the position accuracy is evaluated by the moving distance of the center line of the seeder in the left-right direction relative to the center axis of the rut or linear body. The judgment is as follows. The symbol "◎" shown in Table 1 indicates that the above-mentioned displacement is less than 3 cm. The symbol "○" indicates that the above-mentioned displacement exceeds 3 cm and is less than 10 cm. The symbol "△" indicates that the above-mentioned displacement exceeds 10 cm and is less than 20 cm. The symbol "×" indicates that the above-mentioned displacement exceeds 20 cm.

[0186] (Azimuth)

[0187] The azimuth means the angle formed by the reference direction and the direction in which the seed drill is traveling at the current time point. Specifically, the seed drill is driven in a straight line for 10 meters from a specified position, and then turned back and drove in a straight line for 10 meters. This reciprocating travel is performed 5 times. In addition, the direction in which the seed drill is traveling on the first outgoing route is set as the reference direction, and the angle formed by the reference direction and the direction in which the seed drill is traveling on the fifth outgoing route is set as the azimuth. The azimuth is determined as follows. The symbol "◎" indicates that the azimuth is less than 1°. The symbol "○" indicates that the azimuth exceeds 1° and is less than 3°. The symbol "△" indicates that the azimuth exceeds 3° and is less than 6°. The symbol "×" indicates that the azimuth exceeds 6°.

[0188] (Drainage resistance)

[0189] Resistance to loss means the difficulty of seeds sown in watered farmland to move. It is evaluated by the distance the seeds move from the sowing position after a specified time has passed since the seeds were sown in the farmland using a seed drill. In the case of drainage sowing, it is the distance moved after sowing and then restored to the state of watering. The judgment is as follows. The symbol "◎" shown in Table 1 indicates that the above-mentioned moving distance is less than 3 cm. The symbol "○" indicates that the moving distance exceeds 3 cm and is less than 10 cm. The symbol "△" indicates that the moving distance exceeds 10 cm and is less than 20 cm. The symbol "×" indicates that the moving distance exceeds 20 cm.

[0190] (Water usage)

[0191] The drainage volume used for sowing was evaluated. Draining once is roughly equivalent to draining the water from a paddy field with an irrigation depth of 5 cm. The judgment is as follows. The symbol "◎" shown in Table 1 indicates that the drainage is less than 0.2 times. The symbol "○" indicates that the drainage is more than 0.2 times and less than 0.5 times. The symbol "△" indicates that the drainage is more than 0.5 times and less than 1.0 times. The symbol "×" indicates that the drainage is more than 1.0 times.

[0192] (Weed Amount)

[0193] The results were evaluated at 2 weeks after sowing. 2 The number of weeds was determined as follows. The symbol "◎" shown in Table 1 indicates 50 or less. The symbol "○" indicates more than 50 and less than 100. The symbol "△" indicates more than 100 and less than 200. The symbol "×" indicates more than 200.

[0194] The evaluation results of the above-mentioned Inventive Examples 1 to 17 and Comparative Examples 1 to 6 are summarized and shown in Table 1. In addition, a certain seed drill position described in Table 1 means a position where the seed drill is located.

[0195]

[0196] According to the seed drill and seeding method of the present invention, as shown in Table 1, in Invention Examples 1 to Invention Examples 17, compared with Comparative Examples 1 to Comparative Examples 6, the seed drill can be easily positioned in the farmland in the flooded state, that is, the entire farmland can be regularly sown at constant intervals. In addition, since iron-coated seeds, iron oxide-coated seeds, iron slag-coated seeds, etc. with a higher specific gravity than uncoated seeds are used, they are not easy to lose compared with uncoated seeds. Moreover, since it is possible to sow in the farmland in the flooded state, there is no need to temporarily drain the water during sowing, and as a result, the amount of water used can be reduced compared with the previously known flooded direct seeding method. Moreover, since the farmland is maintained in a state of being filled with water, the growth and growth of weeds can be suppressed compared with the farmland in the drainage state, and bird damage can be suppressed.

[0197] Description of Reference Numerals

[0198] 1, 9, 10, 12, 13, 16, 18 Seeder

[0199] 2 Matrix

[0200] 3, 3R, 3L front wheel

[0201] 4R, 4L rear wheel

[0202] 5 Seeder

[0203] 6.15 Position detection device

[0204] 7 First arm, supporting mechanism

[0205] 8 Second arm, supporting mechanism

[0206] 11. Wheel

[0207] 14 Linear bodies

[0208] 17 Handle

[0209] 17a, 17b One side of the handle

[0210] 19 Portable Terminal

[0211] 20 Positioning satellites

[0212] 21 Receiving Department

[0213] 22 Control Department

[0214] 23 Storage

[0215] 24 Display unit

[0216] 25 Operation unit.

Claims

1. A seed drill, comprising a base body supported by wheels configured to be able to travel on a farmland under water, and a seed drill for sowing seeds on the farmland, wherein: The seed drill includes a position detection device arranged on the base, and the position detection device uses at least any one of the ruts formed by the wheels on the farmland, the water channels pre-formed on the farmland, the linear grooves pre-formed on the farmland, and the flexible linear bodies pre-stretched in a straight line on the farmland as a guide and engages with the guide.

2. The seed drill according to claim 1, The position detection device uses at least any one of the ruts formed by the wheels on the farmland, the waterways preformed on the farmland, and the linear grooves preformed on the farmland as a guide, and deforms in the left-right direction or swings in the left-right direction by the base moving relative to the guide in the left-right direction relative to the travel direction.

3. The seed drill according to claim 2, The position detection device is configured in a rod shape. The base is provided with a support mechanism configured to support the position detection device with a predetermined interval between the position detection device and the base in the left-right direction.

4. The seed drill according to claim 1, The position detection device uses a flexible linear body that is preliminarily stretched in a straight line on the farmland as a guide, and is engaged with the linear body so as to be relatively movable.

5. The seed drill according to claim 4, The position detection device includes either a slit configured to engage the linear body in a relatively movable manner or a hole formed to penetrate the position detection device in a plate thickness direction to engage the linear body in a relatively movable manner.

6. The seed drill according to claim 1, The seed drill further includes a position information acquisition device that acquires position information based on a signal acquired from a satellite positioning system.

7. A sowing method, comprising sowing seeds using the sowing machine according to any one of claims 1 to 5.

8. The sowing method according to claim 7, The seeds are coated with a seed coating agent containing a metal material on the surface, and the specific gravity of the seeds is 1.2 g / cm 3 Above and 4.0g / cm 3 the following.

Images