Tank mounting type liquid fertilizer application device

Abstract

To provide a liquid fertilizer application device or method capable of supporting a compact tractor and capable of applying a large amount of liquid fertilizer down to a deep layer in the soil.SOLUTION: A liquid fertilizer application device applying liquid fertilizer to a field pulled by a tractor has: a liquid fertilizer tank for reserving liquid fertilizer; a soil cutting part provided with a molding lifting plate and two molding cutting blades connected in a nearly V-shaped via the molding lifting plat; a frame to which the soil cutting part is fixed in a lower part and the liquid fertilizer tank is fixed in an upper part and which is removably connected to the tractor; and a liquid fertilizer insertion tube which is fixed around the molding cutting blade and communicates with the liquid fertilizer tank.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an apparatus for applying liquid fertilizer to soil.

Background Art

[0002] The liquid component of livestock manure, which is the stagnant livestock excrement within rural areas, is a resource with low-cost fertilizer components, and its utilization has been under consideration in pastures and paddy fields. However, in field cultivation with a large amount of chemical fertilizer input, the substitution rate of the fertilizer component amount is low with the conventional spraying method, and it has been difficult to apply a sufficient amount, so the merits of its utilization have been small. In addition, in Honshu, since conventional working machines for spraying liquid fertilizer using livestock manure are large, they have not been introduced. Therefore, by introducing technologies for suppressing ammonia volatilization of fertilizer components enabling fertilization substitution and technologies enabling large-scale application into the soil compatible with small tractors in Honshu to the production site, the establishment of a cultivation system enabling fertilization substitution for maximizing the utilization of regional organic resources such as livestock manure is required.

[0003] Conventionally, slurry and digestive juice, which are the liquid components of livestock manure and its fermentation residues, have been applied to farmland by spraying them on the surface using a spraying vehicle of a slurry lorry or a tractor-mounted spreader of a slurry tank. With this method, the application rate is within 40 t / ha. If the application rate exceeds this amount, the slurry will accumulate on the surface, and when the terrain has an incline or due to rain, etc., phosphoric acid, bases, etc. will flow out of the field. Also, in Honshu, it has been impossible to use the conventional large working machines and the application methods that generate odors. Therefore, several technologies for applying liquid fertilizer into the soil using slurry injectors have been proposed. Patent Document 1 discloses an application method for suppressing odor generation by applying liquid fertilizer to a deep position in the soil by using a working machine that inserts slurry into the grooves of the claw marks of two subsoilers. However, since it is an application in two rows with a fixed width and there is no mechanism for adjusting the application rate, it has been difficult to introduce it to the field for the purpose of fertilization substitution, such as uneven application rates. In Patent Document 2, a fertilizer and seeding apparatus using a slurry tank that enables fertilization and seeding by injecting slurry into the shallow layer of the soil cutting part is disclosed. In Patent Document 3, a slurry flow control device used in the shallow layer type slurry injector of Patent Document 2 is disclosed. In Patent Document 4, a slurry flow control device for the shallow layer type slurry injector of Patent Documents 2 and 3 is disclosed. All of them are technologies that enable application in multiple rows. However, since the insertion depth into the soil is shallow and the application is by multiple injectors arranged at regular intervals, the width of the machine becomes long, which causes problems during the running of the machine. Patent Document 5, Non-Patent Document 1, and Non-Patent Document 2 all disclose an apparatus that cuts soil and applies livestock manure and urine to the soil by spraying it there.

[0004] With these conventional technologies, it is difficult to apply a large amount of liquid fertilizers such as livestock manure slurry and digestive fluid deep into the soil. There is also no disclosure of an apparatus that is considered to be compatible with small tractors.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Non-Patent Documents

[0006]

Non-Patent Document 1

Non - Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The above - mentioned conventional technologies have the following problems. (1) Technologies that can apply a large amount of liquid fertilizers such as livestock manure slurry and digested liquid deep into the soil use large tractors and large tank trucks and are not technologies compatible with small tractors. (2) Due to the use of large machinery, the mechanical running performance of the application unit is poor as a construction method. (3) Although there are buried objects such as gravel in the field, the structure of the application unit is not capable of dealing with them. (4) There is no disclosure of a method for not only evenly distributing a liquid such as liquid fertilizer in an arbitrary amount but also granulating the impure solids contained in the liquid such as liquid fertilizer.

[0008] In view of the above situation, the present invention provides a liquid fertilizer application device or method that can be handled even by a small tractor and can apply a large amount of liquid fertilizer deep into the soil.

Means for Solving the Problems

[0009] To achieve the above object, the present invention provides the following configuration. 1) An aspect of the present invention is A liquid fertilizer application device for applying liquid fertilizer to a field towed by a tractor, a liquid fertilizer tank for storing liquid fertilizer, and a soil cutting part including a formed lifting plate and two formed cutting blades connected in a substantially V shape with the formed lifting plate interposed therebetween, a frame in which the soil cutting part is fixed at the lower part, the liquid fertilizer tank is fixed at the upper part, and is detachably connected to a tractor, a liquid fertilizer insertion pipe fixed around the formed cutting blade and communicating with the liquid fertilizer tank, and has by the progress of the soil cutting part in the soil, crushed soil suitable for fertilization is formed inside the substantially V shape formed by the formed cutting blade, and at the same time, the liquid fertilizer in the liquid fertilizer tank is applied from the liquid fertilizer insertion pipe to the soil, which is characterized in that. 2) In the above aspect, the frame includes a formed cutting blade frame for fixing the formed cutting blade and a three-point link connection frame for connecting to a tractor, and the angle of the formed cutting blade frame with respect to the three-point link connection frame is changed by a hydraulic cylinder connecting the formed cutting blade frame and the three-point link connection frame, so that the construction depth of the soil cutting part can be adjusted in the range of 0 to 50 cm, which is characterized in that. 3) In the above aspect, it is characterized in that the soil cutting part can be provided in 1 to 3 series. 4) In the above aspect, the liquid fertilizer insertion pipe is arranged along the formed cutting blade at a position inside, outside, or on the rear side opposite to the traveling direction of the substantially V-shaped formed cutting blade, or a combination thereof, and in a state where the formed cutting blade is inserted into the soil, the outflow port, which is the outlet of the liquid fertilizer in the liquid fertilizer insertion pipe, is arranged so as to be located in the soil, which is characterized in that. 5) In the above aspect, in a state where the formed cutting blade is inserted into the soil, the outflow port of the liquid fertilizer insertion pipe is arranged perpendicular to the side surface of the part of the formed cutting blade that is not inserted into the soil, which is characterized in that. 6) The aspect of the present invention is A liquid fertilizer distributor for distributing liquid fertilizer supplied from a liquid fertilizer tank to a plurality of liquid fertilizer insertion pipes, a cylindrical distribution container having a bottom surface, a distribution container lid, a liquid fertilizer inlet provided on the distribution container lid, a rotating shaft located at the center of the distribution container and rotatable by a motor, and a plurality of holes provided on the bottom surface at equal angular intervals around the rotating shaft and at equal distances from the rotating shaft, a plurality of distribution plates extending from the rotating shaft to near the inner surface of the distribution container and equally partitioning the interior of the distribution container, and distribution plate blades provided at the upper edges in the vertical direction of each of the distribution plates, characterized in that each of the distribution plates is arranged at an angle of 1 to 30 degrees in the rotation direction from a plane perpendicular to the bottom surface of the distribution container. 7) In the above aspect, characterized in that the number of the holes is equal to the number of the distribution plates. 8) In the above aspect, the above liquid fertilizer distributor is provided. 9) An aspect of the present invention is a liquid fertilizer application device including a liquid fertilizer tank, a liquid fertilizer insertion pipe communicating therewith, a soil cutting part including a forming lifting plate and two forming cutting blades connected in a substantially V shape with the forming lifting plate interposed therebetween, and a frame to which the soil cutting part is fixed at the lower part and the liquid fertilizer tank is fixed at the upper part and which is detachably connected to a tractor. By pulling the liquid fertilizer application device by a tractor, the soil cutting part is advanced in the soil, and while forming a substantially V-shaped soft soil inside, liquid fertilizer is applied from the liquid fertilizer insertion pipe arranged along the side surface of each forming cutting blade or the rear side in the direction opposite to the direction in which the tractor is pulled into the soft soil. 10) In the above aspect, the liquid fertilizer application device is provided with the above liquid fertilizer distributor.

Effects of the Invention

[0010] A liquid fertilizer application device or method that can be used even with a small tractor, and it has become possible to apply a large amount of liquid fertilizer to the deep layer in the soil.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 14

Mode for Carrying Out the Invention

[0012] Referring to FIG. 1, the liquid fertilizer application device M according to the present invention will be described. The liquid fertilizer application device M is detachable from the tractor and can be towed by the tractor to move forward. In this specification, the front F shown in FIG. 1 refers to the direction in which the liquid fertilizer application device M is connected to the tractor, that is, the traveling direction of the liquid fertilizer application device M. The direction opposite to the front F is the rear R. The liquid fertilizer application device M includes a liquid fertilizer tank 17 for storing the liquid fertilizer 30, a soil cutting part 25 (see FIG. 1(b)) including a forming lifting plate 21 and two forming cutting blades 20 connected in a substantially V shape with the forming lifting plate 21 interposed therebetween, and a frame to which the soil cutting part 25 is fixed at the lower part, the liquid fertilizer tank 17 is fixed at the upper part, and is detachably connected to the tractor.

[0013] This frame includes a three-point link connection frame 12 which is a sub-frame mainly for connecting to the tractor by a so-called three-point link, a forming cutting blade frame 14 which is a sub-frame for fixing the forming cutting blade 20, and a liquid fertilizer tank frame 16 which is a sub-frame for fixing the liquid fertilizer tank 17. Each sub-frame is for convenience of explanation, and each may be manufactured separately, or the whole or a part may be integrally manufactured.

[0014] Since the liquid fertilizer application device M is connected to the tractor by a so-called three-point link, it is equipped with a three-point link connection frame 12. In the front view of FIG. 2, the frame 12 is provided with a top link connection portion 10 above the center and two lower link connection portions 11 on the left and right with it as the center.

[0015] The three-point link connection frame 12 is rotatably connected to the forming cutting blade frame 14 on the rear R side. The connection cutting blade frame 14 has a forming cutting blade holder 15 for supporting the forming cutting blade 20.

[0016] As shown in FIG. 1(b), in the front view of the soil cutting portion 25, two forming cutting blades 20 are connected so as to form a substantially V shape. The connection portion of the two forming cutting blades 20 has a bottom surface with a certain width, and a forming lifting plate 21 is installed so as to be interposed between the two forming cutting blades 20. As shown in FIG. 1(a), the forming cutting blade 20 is curved in a side view, and the forming lifting plate is installed so as to rise from the front F side to the rear R side. Due to this shape, when the liquid fertilizer application device M is pulled by the tractor and the forming cutting blade 20 and the forming lifting plate 21 inserted into the soil move forward, the soil 1 inside this series of forming cutting blades 20 is lifted by the forming lifting plate, and when the forming cutting blade passes, it falls downward again and is crushed, and for example, as shown by the hatching of the horizontal line in FIG. 6(a), substantially V-shaped crushed soil 2 is formed in the front view of the figure. This crushed soil 2 is in a state of being soft and swollen and the liquid fertilizer 30 easily penetrates within its range.

[0017] The liquid fertilizer application device M can also handle buried objects when applying to deep layers in the soil. For buried objects such as stones up to a certain size, they can pass through the inside of the substantially V shape formed by the two forming cutting blades 20. Also, when the forming cutting blade 20 or the forming lifting plate 21 collides with a huge object, the liquid fertilizer application device M is equipped with a mechanism in which a safety pin (not shown) breaks, and the forming cutting blade 20 and the forming lifting plate 21 lift up to the ground surface without resisting the force received, preventing damage to the liquid fertilizer application device M and the tractor.

[0018] The liquid fertilizer application device M can be installed with 1 to 3 consecutive soil cutting parts 25. In Fig. 2, as an example, the liquid fertilizer application device M equipped with 3 consecutive soil cutting parts 25 is shown. When providing a plurality of consecutive soil cutting parts 25, they can also be arranged at arbitrary intervals.

[0019] The three-point link connection frame 12 and the forming cutting blade frame 14 are also rotatably connected via a hydraulic cylinder 13. This hydraulic cylinder 13 can be operated using the hydraulic system of the tractor, and by its expansion and contraction, the angle of the forming cutting blade frame with respect to the three-point link connection frame can be changed, which means that the inclination of the forming cutting blade frame 14 with respect to the soil surface can be adjusted. By this operation, the insertion condition of the forming cutting blade 20 into the soil and the pulling up from the soil are performed. By adjusting using this hydraulic cylinder 13, the construction depth can be adjusted in the range of 0 to 50 cm.

[0020] A liquid fertilizer tank frame 16 is fixed to the upper part of the forming cutting blade frame 14. A liquid fertilizer tank 17 for storing the liquid fertilizer 30 is fixed to the upper part of the liquid fertilizer tank frame 16. For example, as shown in Fig. 2, one liquid fertilizer tank 17 can be provided on each side in the front view. The fixing of the liquid fertilizer tank 17 to the liquid fertilizer tank frame 16 is not particularly limited as long as it can withstand the vibration of agricultural work, but it is preferably installed so that the liquid fertilizer tank 17 itself can be attached and detached. The liquid fertilizer 30 refers to liquids such as the liquid of manure slurry, which is livestock excrement, or the fermented digestive liquid of its fermented liquid, and the adjusted liquid fertilizer.

[0021] The liquid fertilizer application device M includes a liquid fertilizer insertion pipe 37 for finally applying the liquid fertilizer 30 to the soil. This liquid fertilizer insertion pipe 37 is preferably provided fixed around each forming cutting blade 20. In this case, two liquid fertilizer insertion pipes 37 are provided for one consecutive soil cutting part 25, and six liquid fertilizer insertion pipes 37 are provided for three consecutive soil cutting parts 25 (see Fig. 2). By adjusting the positions of the forming cutting blade frame 14 to the soil cutting part 25 using the above hydraulic system, the position of the liquid fertilizer insertion pipe 37 provided at a fixed position with respect to the forming cutting blade 20 is also adjusted.

[0022] When the liquid fertilizer application device M is towed by the tractor and advances, as the soil cutting part 25 advances in the soil 1, the soil is crushed into a substantially V-shaped while, at the same time, the liquid fertilizer 30 in the liquid fertilizer tank is applied into the crushed soil 2 through the liquid fertilizer insertion pipe 37. By applying the liquid fertilizer 30 from the liquid fertilizer insertion pipe 37 into the gaps of the soft soil in the crushed soil 2, the liquid fertilizer 30 can be completely buried so as not to be exposed on the surface of the soil 1, that is, not to come into contact with the atmosphere, and it is not necessary to volatilize ammonia, which is a nitrogen fertilizer component, into the atmosphere. Thereby, the utilization rate of nitrogen fertilizer can be increased.

[0023] As an example, with the soil cutting part 25 inserted into the soil to a construction depth of 50 cm, the distance near the ground surface between the two forming cutting blades 20 forming a substantially V shape is about 60 cm, and each forming cutting blade 20 itself forms a groove (gap) about 5 cm wide in the soil to the deep layer. By forming the soft crushed soil 2 having this size in the front view (the viewpoint of FIG. 2), the upper limit of the application amount increases. In the crushed soil 2 thus formed, the range of the depth of about 1 cm to 50 cm becomes the deep-layer application part of the liquid fertilizer in the soil. By using the above-mentioned grooves (gaps) of about 5 cm formed on both sides of the deep-layer application part of the liquid fertilizer in the soil, the liquid fertilizer 30 can be applied into the crushed soil 2. By adjusting the soil cutting part 25 from 1 to 3 sets, the application of the liquid fertilizer 30 into the soil up to a maximum of 20 t / 10a becomes possible.

[0024] In order to distribute the liquid fertilizer 30 from the liquid fertilizer tank 17 to the plurality of liquid fertilizer insertion pipes 37, the liquid fertilizer application device M can be provided with a liquid fertilizer distributor 31 between the liquid fertilizer tank 17 and the liquid fertilizer insertion pipe 37 (see FIGS. 1 and 2).

[0025] The liquid fertilizer distributor 31 will be described with reference to FIG. 3. As shown in FIG. 3(b), the liquid fertilizer distributor 31 includes a distribution container 60 and a distribution container lid 63. The distribution container 60 has a cylindrical shape with a bottom surface 61. A transport pipe 32 is provided as a passage for the liquid fertilizer 30 connecting the liquid fertilizer distributor 31 and the liquid fertilizer tank 17 (see FIGS. 1(a) and 3(b)). The transport pipe 32 is connected to a hole opened at the center of the distribution container lid 63, and the liquid fertilizer 30 is injected from the liquid fertilizer tank 17 into the distribution container 60 by the weight of the liquid fertilizer 30. At this time, the distribution container lid 63 and the distribution container 60 are firmly sealed, for example, by a distribution container lid fastener 64 so that the liquid fertilizer 30 does not leak from the distribution container 60.

[0026] As shown in FIG. 3(a), inside the distribution container 60, there are a rotating shaft 66 rotatable by a motor 65 provided on the lower side of the distribution container 60 (see FIGS. 1(a) and 3(b)), a plurality of holes 62 provided on the bottom surface 61 at equal angular intervals around the rotating shaft 66 and at an equal distance from the rotating shaft, a plurality of distribution plates 68 extending from the rotating shaft 66 to the vicinity of the inner surface of the distribution container 60 and evenly partitioning the inside of the distribution container 60, and distribution plate blades 67 provided at the edges on the upper side in the vertical direction of each distribution plate 68, that is, on the side of the liquid fertilizer injection port 69. The distribution plates 68 and the distribution plate blades 67 may be integrally manufactured or manufactured as separate members. It is preferable that the number of distribution plates is equal to the number of holes 62. More preferably, the number is also equal to the number of liquid fertilizer insertion pipes 37.

[0027] Each distribution plate 68 is arranged at an angle of about 1 to 30 degrees in the rotation direction from a plane perpendicular to the bottom surface 61 of the distribution container 60. Therefore, as shown in FIG. 3(a), the side surface of the distribution plate 68 can be visually recognized in a plan view.

[0028] The liquid fertilizer distributor 31 and the liquid fertilizer insertion pipes 37 are connected by a liquid fertilizer distribution hose 36. One end of each liquid fertilizer distribution hose 36 connected to each liquid fertilizer insertion pipe 37 is installed in each hole 62 as shown in FIG. 3(b).

[0029] As the rotating shaft 66 rotates, the distribution plate 68 rotates, and the impurities of the liquid fertilizer 30 injected from the liquid fertilizer inlet 69 are cut by the distribution plate blade 67 with an angle. With this rotating action, an equal amount of the liquid fertilizer 30 flows into the distribution container 60 partitioned by the distribution plate, and then flows into each liquid fertilizer distribution hose 36 through the respective holes 62 in the bottom surface 61.

[0030] The distribution container lid 63 is provided with a transparent container window 70 that enables visual recognition of the inside of the distribution container 60 (Fig. 3(b)). This allows the state of rotation of the rotating shaft 66 described above, the state of the liquid fertilizer 30 being cut, the distribution status of the liquid fertilizer 30, etc. to be confirmed. For example, a container window 70 of a size shown in the position indicated by the two-dot chain line in Fig. 3(a) can be provided.

[0031] In the example shown in Fig. 3(a), six holes 62 are provided, and the internal space of the distribution container 60 is partitioned into six by six distribution plates 68. In this case, as shown in Fig. 2, it is assumed to be used for the six liquid fertilizer insertion pipes 37 mainly installed on each forming cutting blade 20 of the triple soil cutting part 25. As a modification of this, in the example shown in Fig. 4(a), an example is shown where four holes 62 are provided, and the internal space of the distribution container 60 is partitioned into four by four distribution plates 68. In this case, it is assumed to be used for the four liquid fertilizer insertion pipes 37 mainly installed on each forming cutting blade 20 of the double soil cutting part 25. As another modification, in the example shown in Fig. 4(b), an example is shown where two holes 62 are provided, and the internal space of the distribution container 60 is partitioned into two by two distribution plates 68. In this case, it is assumed to be used for the two liquid fertilizer insertion pipes 37 mainly installed on each forming cutting blade 20 of the single soil cutting part 25.

[0032] The liquid fertilizer distributor 31 itself can be widely used in a device that distributes liquid fertilizer mixed with impurities into a plurality of pipes, and can be used regardless of the scale of the device.

[0033] As shown in Fig. 1, the liquid fertilizer application device M is provided with a valve 40 for enabling the start / stop of the supply of the liquid fertilizer 30 injected from the liquid fertilizer tank 17 to the liquid fertilizer distributor 31. For example, by adjusting the opening degree of this valve to fully open, 3 / 4 open, half open, 1 / 4 open, or closed, the flow rate of the liquid fertilizer 30 to be injected can be adjusted. The valve opening and closing mechanism can be operably provided by manual operation, the expansion and contraction of a hydraulic cylinder, an electric valve (shutter type), or a combination thereof. In addition, in order to fertilize with an appropriately planned fertilization amount, regarding the adjustment of the flow rate of the liquid fertilizer, for example, instead of adjusting by a valve, it may be adjusted by the traveling speed of the tractor that pulls the liquid fertilizer application device M.

[0034] Hereinafter, several embodiments regarding the position where the liquid fertilizer insertion pipe 37 is arranged will be described. As one embodiment, as shown in FIGS. 1 and 5, the liquid fertilizer insertion pipe 37 can be arranged along the rear side of the two formed cutting blades 20 that form a substantially V shape. The liquid fertilizer insertion pipe 37 may be arranged along so as to be in contact with the formed cutting blade 20, or may be arranged along the formed cutting blade 20 while providing a gap as shown in FIG. 1(a). However, it is desirable that their relative positions be fixed during liquid fertilizer application. In particular, during liquid fertilizer application, it is desired that the liquid fertilizer insertion pipe 37 be fixed so that the depth in the soil at the outlet 38 at the tip does not change. In order to fixedly arrange the liquid fertilizer insertion pipe 37, for example, as shown in FIGS. 5(b) and 5(c), the fixing member 39 provided on the formed cutting blade holder 15 may be used. It is sufficient that the liquid fertilizer insertion pipe 37 is arranged at a stable position even during agricultural work. Fixing members may be provided at other locations, or other fixing methods may be used. The manner or method of arranging such a liquid fertilizer insertion pipe 37 along the formed cutting blade 20 and the fixing member 39 are also common in other embodiments described later.

[0035] When the liquid fertilizer applicator M is advanced while being towed by a tractor, the forming cutting blade 20 moves through the soil 1 in the leftward direction of the drawing from the perspective of Fig. 5(b) and in the frontward direction of the drawing from the perspectives of Figs. 5(a) and 6. In the soil 1 as shown in Fig. 6, the soil 1 inside the two forming cutting blades 20 forming a substantially V shape becomes crushed soil 2. It is possible to apply the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe installed on the rear side of the forming cutting blade 20 into the gap in the portion where the forming cutting blade 20 itself has passed through the soil 1.

[0036] Fig. 6(b) shows the state of the substantially V-shaped crushed soil 2 after the liquid fertilizer 30 has been applied according to this embodiment. Since the liquid fertilizer 30 is completely buried in the soil, it is possible to suppress volatilization of ammonia and the like which are main fertilizer components and are likely to volatilize.

[0037] As another embodiment, as shown in Fig. 7, the liquid fertilizer insertion pipe 37 can be arranged along the inside of the two forming cutting blades 20 forming a substantially V shape. In this case, as shown in Fig. 8, the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe 37 can be applied to below the crushed soil 2 along the forming cutting blade 20 due to surface tension.

[0038] As still another embodiment, as shown in Fig. 9, the liquid fertilizer insertion pipe 37 can be arranged along the outside of the two forming cutting blades 20 forming a substantially V shape. In this case, as shown in Fig. 10, the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe 37 can be applied to below the crushed soil 2 along the forming cutting blade 20 due to surface tension.

[0039] As yet another embodiment, as shown in Fig. 11, when the soil cutting portion 25 is inserted into the soil, the liquid fertilizer insertion pipe 37 can also be arranged such that the outlet 38 at the tip of the liquid fertilizer insertion pipe 37 faces perpendicularly to the side surface of the portion of the forming cutting blade 20 that is not inserted into the soil. The side surface of the forming cutting blade 20 may be either inside or outside the forming cutting blade 20 forming a substantially V shape in the perspective of the same figure as shown in Fig. 11(a). In this case, as shown in Fig. 11(a), the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe 37 collides with the side surface of the forming cutting blade 20 and enters the state of liquid fertilizer scattering and spraying as shown in Fig. 11(b). The liquid fertilizer 30 easily penetrates into the crushed soil 2 which has become soft and fluffy soil.

[0040] Each of the above-described components, particularly the liquid fertilizer application device M as an integral working machine equipped with a liquid fertilizer tank, has a connection part and size such that it can be towed even by a small tractor, and realizes ensuring mechanical running performance as a whole. Thereby, without using a tank truck, liquid fertilizers such as slurry and digested liquid of livestock manure can be applied. In addition, a soft and fluffy crushed soil 2 having a large number of substantially V-shaped cracks in the front view (viewpoint of Fig. 2) formed by the forming cutting blade 20 is constructed in a planar manner to a deep layer in the soil. The crushed soil 2 continuously formed by the movement of the liquid fertilizer application device M realizes not only applying the liquid fertilizer to the deep layer but also applying a large amount of it.

[0041] And, as described above, particularly, fertilization into the soil made by the liquid fertilizer insertion pipe 37 arranged along the side surface of the forming cutting blade 20 enables effective application to the deep layer. By fertilization using the liquid fertilizer application device M, it is possible to prevent the surface exposure of the liquid fertilizer 30 and prevent the ammonia volatilization and runoff of the liquid fertilizer 30 that generates a bad smell. Thereby, not only the surface exposure during the application of a large amount of liquid fertilizer but also the bias of the liquid fertilizer due to the terrain can be prevented. As a result, a large amount of liquid fertilizer can be applied to the soil and a uniform amount of application can be realized. Since the liquid fertilizer application device M is equipped with a three-point link connection frame 12 that can be connected to an existing tractor and can use an existing liquid fertilizer tank 17, the present invention can be implemented relatively inexpensively.

[0042] The content disclosed above can also be understood as an invention of a method for applying liquid fertilizer 30. That is, by towing the liquid fertilizer application device M, which integrally includes each of the above-described components, with a tractor, the soil cutting part is advanced in the soil, and while forming substantially V-shaped softened soil inside, the liquid fertilizer 30 in the liquid fertilizer tank 17 is applied into the softened soil from the liquid fertilizer insertion pipe 37 arranged along the side surface of each forming cutting blade or the rear side opposite to the advancing direction. By using the above-described liquid fertilizer distributor 31 in this liquid fertilizer application device M, while cutting impurities of the liquid fertilizer 30, an equal amount of the liquid fertilizer 30 flows into each liquid fertilizer insertion pipe 37.

[0043] [Example 1] Examples of the present invention are shown below. Assuming a liquid fertilizer application device M (see Fig. 5) with the liquid fertilizer insertion pipe 37 installed on the rear side of the forming cutting blade 20, a deep soil layer application area for the liquid fertilizer 30 was set up. The distribution of ammonia nitrogen in the soil during deep soil layer application was measured, and the results of the cross-sectional distribution diagram of the components are shown in Fig. 12. The test conditions are as follows. · Test date: March 29, 2023 · Test location: Black clay soil field of the Rural Engineering Research Department in Tsukuba City, Ibaraki Prefecture · Tractor used: Kubota SMZ76 76-horsepower half crawler tractor · Working machine used: As a test trial, a small liquid fertilizer application device M having three forming cutting blades 20 in a substantially V shape was used, and test application was carried out at an insertion depth of 40 cm for each forming cutting blade 20. · Liquid fertilizer used: Methane fermentation digestate (livestock manure system) Ammonia nitrogen concentration 0.17% · Application treatment: Soil application using the liquid fertilizer application device M according to the present invention · Application rate: 8 t / 10a · Chemical fertilizer (nitrogen equivalent): Equivalent to 13.6 kgN / 10a

[0044] As shown in Fig. 12, the concentration of ammonia nitrogen in the soil application area of this example was higher as the depth increased. Even in the surface layer at a depth of 0 to 10 cm, the liquid fertilizer 30 was applied into the soil without being exposed. Also, immediately after application, there was no movement of ammonia components from the application part to the surrounding area, and it was found that they were retained in the application part.

[0045] [Example 2] Assuming a liquid fertilizer application device M (see Fig. 9) with the liquid fertilizer insertion tube 37 installed outside the forming cutting blade 20, a deep soil application area for the liquid fertilizer 30 was set up. The volatilization amount of ammonia gas from the ground surface after liquid fertilizer application was measured, and the results are shown in Fig. 13 as the ammonia gas volatilization rate. The test conditions are as follows. · Test date: March 29, 2023 · Test location: Black clay soil field of the Rural Engineering Research Department in Tsukuba City, Ibaraki Prefecture · Tractor used: Kubota SMZ76 76-horsepower half crawler tractor · Liquid fertilizer used: Methane fermentation digestate (livestock manure-based) Ammonia nitrogen concentration 0.17% · Application treatment: 1) Soil application using the liquid fertilizer application device M according to the present invention 2) Surface spraying on the ground surface of the prior art · Application rate: 8 t / 10a (the same amount for both the soil application area and the surface spraying area) · Chemical fertilizer (nitrogen equivalent): Equivalent to 13.6 kgN / 10a

[0046] As shown in Fig. 13, the ammonia gas volatilization rate in the soil application area applied using the liquid fertilizer application device M according to the present invention was zero. This indicates that the volatilization of ammonia gas can be suppressed by applying the liquid fertilizer 30 into the soil and completely covering it with soil.

[0047] [Comparative Example 1] In Fig. 14, assuming surface spraying of the prior art method, the liquid fertilizer 30 was sprayed on the ground surface to measure the distribution status of ammonia nitrogen in the soil, and the results of the cross-sectional distribution diagram of the components are shown. The test conditions are as follows. · Test date: March 29, 2023 · Test site: Black peat soil field of the Rural Engineering Research Department in Tsukuba City, Ibaraki Prefecture · Application method: Manual application · Liquid fertilizer used: Methane fermentation digestate (livestock manure-based) Ammoniacal nitrogen concentration 0.17% · Application location: Surface spraying onto the ground surface · Application rate: 8 t / 10a (the same amount for both the surface spraying area and the soil application area) · Chemical fertilizer (in terms of nitrogen): Equivalent to 13.6 kg N / 10a

[0048] As shown in Fig. 14, the position with a high concentration of ammoniacal nitrogen in the surface spraying of the conventional method is the surface layer with a depth of 0 - 10 cm at the application part, and most of it is on the surface. Immediately after application, there is no movement of nutrients to the lower layer, and it is a condition where the volatilization of ammonia gas is likely to occur.

[0049] As shown in Fig. 13, the ammonia gas volatilization rate in the surface spraying area of the conventional method is high after application and gradually decreases, but continues for a relatively long time. As long as there is liquid fertilizer 30 on the ground surface, the volatilization of ammonia gas continues, promoting the reduction of nitrogen components.

[0050] The combination of the arrangement of the liquid fertilizer insertion pipes or the arrangement for each forming cutting blade 20, the arrangement relationship of each component in the liquid fertilizer application device M, the piping method between each component, the piping material, the fixing method of the liquid fertilizer insertion pipe 37, the fixing method of the liquid fertilizer tank, the size of the tank, etc., are all examples and do not limit the invention content as long as the object of the present invention can be achieved. Regarding the liquid fertilizer application device, method, and liquid fertilizer distributor disclosed above, as long as the combination described therein is included in the scope of the claims, it shall be included in the disclosed scope.

Explanation of reference numerals

[0051] 1 Soil 2 Crushed soil 10 Top link connection part 11 Lower link connection part 12 Three-point link connection frame 13 Hydraulic cylinder 14 Forming cutting edge frame 15 Forming cutting edge holder 16 Liquid fertilizer tank frame 17 Liquid fertilizer tank 20 Forming cutting edge 21 Forming lifting plate 25 Soil cutting part 30 Liquid fertilizer 31 Liquid fertilizer distributor 32 Transport pipe 36 Liquid fertilizer distribution hose 37 Liquid fertilizer insertion pipe 38 Outlet 39 Fixing member 40 Valve 60 Distribution container 61 Bottom surface 62 Hole 63 Distribution container lid 64 Distribution container lid fastener 65 Motor 66 Rotating shaft 67 Distribution plate blade 68 Distribution plate 69 Liquid fertilizer inlet 70 Container window M Liquid fertilizer application device F Front R Rear

Claims

1. A liquid fertilizer applicator for applying liquid fertilizer to a field towed by a tractor, comprising: a liquid fertilizer tank for storing liquid fertilizer; a soil cutting part comprising a formed lifting plate and two formed cutting blades connected in a substantially V shape with the formed lifting plate interposed therebetween; a frame to which the soil cutting part is fixed at the lower part, the liquid fertilizer tank is fixed at the upper part, and which is detachably connected to the tractor; a liquid fertilizer insertion pipe fixed around the formed cutting blade and communicating with the liquid fertilizer tank; A liquid fertilizer applicator, characterized in that as the soil cutting part advances in the soil, crushed soil suitable for fertilization is formed inside the substantially V shape formed by the formed cutting blades, and at the same time, the liquid fertilizer in the liquid fertilizer tank is applied from the liquid fertilizer insertion pipe to the soil.

2. The frame includes a formed cutting blade frame for fixing the formed cutting blade and a three-point link connection frame for connecting to the tractor, and the angle of the formed cutting blade frame with respect to the three-point link connection frame is changed by a hydraulic cylinder connecting the formed cutting blade frame and the three-point link connection frame, so that the construction depth of the soil cutting part can be adjusted in the range of 0 to 50 cm. The liquid fertilizer applicator according to claim 1.

3. The liquid fertilizer applicator according to claim 1, characterized in that 1 to 3 soil cutting parts can be provided.

4. The liquid fertilizer insertion pipe is arranged along the formed cutting blade at a position inside, outside, or on the rear side opposite to the advancing direction of the substantially V-shaped formed cutting blade, or a combination of these positions; and The liquid fertilizer applicator according to claim 1, characterized in that in a state where the formed cutting blade is inserted into the soil, the outlet of the liquid fertilizer in the liquid fertilizer insertion pipe, which is the outlet of the liquid fertilizer, is arranged so as to be located in the soil.

5. The liquid fertilizer applicator according to claim 1, characterized in that in a state where the formed cutting blade is inserted into the soil, the outlet of the liquid fertilizer insertion pipe is arranged perpendicular to the side surface of the part of the formed cutting blade that is not inserted into the soil.

6. A liquid fertilizer distributor for distributing liquid fertilizer supplied from a liquid fertilizer tank to a plurality of liquid fertilizer insertion pipes, A cylindrical distribution container having a bottom surface, a distribution container lid, a liquid fertilizer injection port provided on the distribution container lid, a rotating shaft located at the center of the distribution container and rotatable by a motor, and a plurality of holes provided on the bottom surface at equal angular intervals around the rotating shaft and at equal distances from the rotating shaft, a plurality of distribution plates extending from the rotating shaft to near the inner surface of the distribution container and evenly partitioning the interior of the distribution container, and distribution plate blades provided at the upper edges in the vertical direction of each of the distribution plates. A liquid fertilizer distributor, characterized in that each of the distribution plates is arranged at an inclination of 1 to 30 degrees in the rotation direction from a plane perpendicular to the bottom surface of the distribution container.

7. The liquid fertilizer distributor according to claim 6, characterized in that the number of the holes is equal to the number of the distribution plates.

8. A liquid fertilizer application device according to any one of claims 1 to 5, comprising the liquid fertilizer distributor according to claim 6.

9. A method of applying liquid fertilizer into soft soil, comprising pulling a liquid fertilizer application device integrally provided with a liquid fertilizer tank, a liquid fertilizer insertion pipe communicating therewith, a soil cutting part comprising a forming lifting plate and two forming cutting blades connected in a substantially V shape with the forming lifting plate interposed therebetween, and a frame to which the soil cutting part is fixed at the lower part, the liquid fertilizer tank is fixed at the upper part, and is detachably connected to a tractor, so that the soil cutting part advances in the soil, forming a substantially V-shaped soft soil inside, and applying liquid fertilizer from the liquid fertilizer insertion pipe arranged along the side surface of each forming cutting blade or the rear side opposite to the advancing direction into the soft soil.

10. The method according to claim 9, characterized in that the liquid fertilizer application device comprises the liquid fertilizer distributor according to claim 6.

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