Liquid fertilizer distributor

Abstract

To provide a liquid fertilizer application device or method that can be used with a small tractor, and can apply a large amount of liquid fertilizer into a deep layer in the earth.SOLUTION: A liquid fertilizer distributor for distributing liquid fertilizer supplied from a liquid fertilizer tank to a plurality of liquid fertilizer insertion tubes includes: a cylindrical distribution container having a bottom face; a distribution container lid; a liquid fertilizer inlet provided in the distribution container lid; a rotary shaft positioned in the center of the distribution container and rotatable by a motor; a plurality of holes provided in the bottom face at an equal angle interval around the rotary shaft and an equal distance from the rotary shaft; a plurality of distribution plates extending from the rotary shaft to the vicinity of the inner side face of the distribution container, and equally partitioning the inside of the distribution container; and distribution plate blades disposed at edges on the vertical direction upper sides of the distribution plates.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] The liquid portion of livestock manure, a type of livestock waste whose circulation within rural areas is stagnant, is a low-cost fertilizer resource, and its use in pastures and paddy fields has been explored. However, in upland crops where chemical fertilizer inputs are high, the benefits of its use have been limited because conventional application methods result in low fertilizer replacement rates and make it difficult to apply sufficient amounts. Furthermore, in Honshu, the traditional machinery used to apply liquid fertilizer made from livestock manure is large and has not been adopted. Therefore, there is a need to establish a cultivation system that allows for fertilizer replacement and maximizes the use of local organic resources such as livestock manure. This can be achieved by introducing technologies to suppress ammonia volatilization, which allows for fertilizer replacement, and technologies that enable large-volume application into the soil, compatible with small tractors designed for Honshu.

[0003] Traditionally, slurry and digested liquid, which are liquid components of livestock manure and its fermentation residues, have been applied to agricultural land by spreading them on the surface using slurry lorry spreaders or slurry tanker tractor spreaders. This method applies at a rate of up to 40 t / ha. If the rate exceeds this, the slurry will accumulate on the surface, and if the terrain is sloping or if rain occurs, phosphates and bases will be washed out of the field. Furthermore, in Honshu, it was impossible to use conventional application methods that use large machinery or produce odors. For this reason, several techniques for applying liquid fertilizer into the soil using slurry injectors have been proposed. Patent Document 1 discloses a method of applying liquid fertilizer deep into the soil, suppressing odor generation, by using a work machine that inserts slurry into the grooves left by two subsoiler blades. However, because the method applies liquid fertilizer in two fixed-width rows and the mechanism does not allow adjustment of the amount applied, it is difficult to introduce this method into the field as a fertilizer replacement, as it results in uneven application of the amount applied. Patent Document 2 discloses a fertilizer and seeding device using a slurry tanker that enables fertilization and seeding by injecting slurry into the shallow layer of a soil cut section, Patent Document 3 discloses a slurry flow rate control device used with the shallow layer slurry injector of Patent Document 2, and Patent Document 4 discloses the shallow layer slurry injector slurry flow rate control device of Patent Documents 2 and 3. Both are technologies that enable multiple application, but because they are inserted shallowly into the soil and application is performed using multiple injectors arranged at regular intervals, the width of the machine becomes long, which causes problems when the machine is traveling. Patent Document 5, Non-Patent Document 1, and Non-Patent Document 2 all disclose devices that cut the soil and spread livestock manure over it, thereby applying it to the soil.

[0004] These prior art techniques have difficulty in applying large amounts of liquid fertilizer, such as livestock manure slurry or digested liquid, deep into the soil.Furthermore, there is no disclosure of a device that is designed to be compatible with small tractors. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-224909 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-38007 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-38012 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-38013 [Patent Document 5] Japanese Patent Application Laid-Open No. 2008-109886 [Non-patent literature]

[0006] [Non-Patent Document 1] "Small-sized modified shallow-layer slurry injector No. III with high odor suppression and work efficiency," [online], [Retrieved November 20, 2023], Internet<https: / / www.naro.go.jp / project / results / laboratory / nilgs / 2005 / nilgs05-06.html> [Non-patent document 2] "Everyone's Agriculture Plaza Home Page > Farming Handbook > Machinery > Soil Preparation > Soil Preparation (1) Compost Spreading Work", [online], [Retrieved November 20, 2023], Internet<https: / / www.jeinou.com / benri / machine / soil / 2011 / 03 / 311310.html> Summary of the Invention [Problem to be solved by the invention]

[0007] The above-mentioned conventional techniques have the following problems. (1) The technology that can apply large amounts of liquid fertilizer such as livestock manure slurry and digested fluid deep into the soil requires large tractors or large tank trucks, and is not suitable for small tractors. (2) Because a large machine is used, the machine drivability of the application unit is poor. (3) Although there are buried objects such as stones and gravel at the site, the application unit is not structured to accommodate them. (4) There is no disclosure of a method for evenly distributing liquids such as liquid fertilizers in any desired amount, or for reducing the size of impurity solids contained in liquids such as liquid fertilizers.

[0008] In view of the above-mentioned current situation, the present invention provides a liquid fertilizer application device or method that can be used with a small tractor and that can apply a large amount of liquid fertilizer deep into the soil. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides the following configuration. 1) The present invention is characterized in that A liquid fertilizer distributor for distributing liquid fertilizer supplied from a liquid fertilizer tank to a plurality of liquid fertilizer insertion pipes, The apparatus comprises 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, a plurality of holes provided on the bottom surface at equal angular intervals around the rotating shaft and equidistant from the rotating shaft, a plurality of distribution plates extending from the rotating shaft to the vicinity of the inner surface of the distribution container and dividing the inside of the distribution container evenly, and distribution plate blades provided on the vertical upper edge of each of the distribution plates, Each of the distribution plates is disposed at an angle of 1 to 30 degrees in the rotation direction from a plane perpendicular to the bottom surface of the distribution container. 2) In the above embodiment, 2. The liquid fertilizer distributor according to claim 1, wherein the number of the holes is equal to the number of the distribution plates. 3) In the above embodiment, Further comprising a plurality of the liquid fertilizer insertion pipes, The liquid fertilizer insertion pipe is fixed around a roughly V-shaped cutting blade provided on a liquid fertilizer application device that is towed by a tractor and applies liquid fertilizer to a farm field. 4) In the above aspect, The liquid fertilizer insertion pipe is arranged along the shaping cutting blade at a position inside, outside, or rear side opposite to the direction of travel of the substantially V-shaped shaping cutting blade, or a combination thereof; and The liquid fertilizer insertion pipe is characterized in that, when the shaping cutting blade is inserted into the soil, the outlet port, which is the outlet for the liquid fertilizer in the liquid fertilizer insertion pipe, is positioned in the soil. 5) In the above aspect, When the shaping cutter blade is inserted into the soil, the outlet of the liquid fertilizer insertion pipe is arranged perpendicular to the side of the part of the shaping cutter blade that is not inserted into the soil. 6) In the above embodiment, A liquid fertilizer application device integrally comprising a liquid fertilizer tank, a liquid fertilizer insertion pipe connected to the liquid fertilizer tank via the liquid fertilizer distributor, a soil cutting unit having a shaping lifting plate and two shaping cutting blades connected in an approximately V shape via the shaping lifting plate, and a frame to which the soil cutting unit is fixed at the bottom and the liquid fertilizer tank is fixed at the top and which is detachably connected to the tractor, is towed by a tractor to cause the soil cutting unit to advance through the soil, forming approximately V-shaped, loose soil inside the shaping lifting plate, and liquid fertilizer is applied to the loose soil from the liquid fertilizer insertion pipe arranged along the side of each shaping cutting blade or the rear side opposite to the direction of advancement. [Effects of the Invention]

[0010] The liquid fertilizer application device or method can be used even with a small tractor, and makes it possible to apply a large amount of liquid fertilizer deep into the soil. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1(a) is a schematic side view showing the configuration of a liquid fertilizer application device according to the present invention, and FIG. 1(b) is a schematic front view of a soil cutting section. [Figure 2] FIG. 2 is a schematic front view of the liquid fertilizer application device according to the present invention. [Figure 3] Figure 3(a) is a schematic plan view of a distribution container in the liquid fertilizer distributor, and Figure 3(b) is a schematic side view of the liquid fertilizer distributor. [Figure 4] Figure 4(a) is a schematic plan view of a distribution vessel with four distribution plates, and Figure 4(b) is a schematic plan view of a distribution vessel with two distribution plates. [Figure 5] Figure 5 shows a liquid fertilizer insertion pipe positioned behind the soil cutting section and the shaping cutting blade, where (a) is a schematic front view, (b) is a schematic side view, and (c) is a schematic rear view. [Figure 6] Figure 6(a) is a diagram showing a schematic diagram of the state of the soil when the liquid fertilizer insertion pipe is placed behind the shaping cutting blade and applied, and Figure 6(b) is a diagram showing an example of the state of the soil after the liquid fertilizer has been applied. [Figure 7]Figure 7 shows a liquid fertilizer insertion pipe arranged inside the soil cutting section and the shaping cutting blade, where (a) is a schematic front view, (b) is a schematic side view, and (c) is a schematic back view. [Figure 8] Figure 8(a) is a diagram showing a schematic diagram of the state of the soil when the liquid fertilizer insertion pipe is placed inside the shaped cutting blade and applied, and Figure 8(b) is a diagram showing an example of the state of the soil after the liquid fertilizer has been applied. [Figure 9] Figure 9 shows a liquid fertilizer insertion pipe arranged outside the soil cutting section and the shaping cutting blade, where (a) is a schematic front view, (b) is a schematic side view, and (c) is a schematic back view. [Figure 10] Figure 10(a) is a diagram showing a schematic diagram of the state of the soil when the liquid fertilizer insertion pipe is placed outside the shaping cutting blade and applied, and Figure 10(b) is a diagram showing an example of the state of the soil after the liquid fertilizer has been applied. [Figure 11] Figure 11(a) is a schematic front view showing the liquid fertilizer application when the outlet of the liquid fertilizer insertion pipe is positioned toward the side of the shaping cutting blade, and Figure 11(b) is an example diagram showing the state of the soil after liquid fertilizer application in this position. [Figure 12] FIG. 12 is a table showing the concentration distribution of inorganic nitrogen in the soil in Example 1. [Figure 13] FIG. 13 is a table showing the results of measuring the amount of ammonia gas volatilized from the ground surface in Example 2. [Figure 14] FIG. 14 is a table showing the concentration distribution of inorganic nitrogen in the soil in Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] A liquid fertilizer application device M according to the present invention will be described with reference to FIG. The liquid fertilizer application device M can be attached to and detached from a tractor, and can be towed by the tractor to travel. In this specification, the forward direction F shown in Fig. 1 refers to the direction in which the liquid fertilizer application device M is connected to the tractor, i.e., the traveling direction of the liquid fertilizer application device M. The direction opposite to the forward direction F is referred to as the backward direction R. The liquid fertilizer application device M comprises a liquid fertilizer tank 17 for storing liquid fertilizer 30, a soil cutting section 25 (see Figure 1(b)) having a shaping lifting plate 21 and two shaping cutting blades 20 connected in an approximately V shape with the shaping lifting plate 21 in between, and a frame to which the soil cutting section 25 is fixed at the bottom and the liquid fertilizer tank 17 is fixed at the top and which is detachably connected to a tractor.

[0013] This frame mainly includes a three-point link connection frame 12, which is a subframe for connecting to a tractor via a so-called three-point link, a forming cutter blade frame 14, which is a subframe for fixing a forming cutter blade 20, and a liquid fertilizer tank frame 16, which is a subframe for fixing a liquid fertilizer tank 17. Each subframe is shown for convenience of explanation, and may be fabricated separately, or may be fabricated as a whole or in part as a single unit.

[0014] The liquid fertilizer application device M is connected to the tractor by a so-called three-point link, and is equipped with a three-point link connection frame 12. The frame 12 has a top link connection part 10 at the upper center when viewed from the front in Figure 2, and two lower link connection parts 11 on the left and right of the top link connection part 10.

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

[0016] As shown in FIG. 1(b), two shaping cutter blades 20 are connected to form an approximately V-shape in a front view of the soil cutting unit 25. The joint between the two shaping cutter blades 20 has a bottom surface of a fixed width, and a shaping lifting plate 21 is installed between the two shaping cutter blades 20. As shown in FIG. 1(a), the shaping cutter blades 20 are curved in a side view, and the shaping lifting plate is installed so that it rises from the front F side to the rear R side. Due to this shape, when the liquid fertilizer application device M is towed by a tractor and the shaping cutter blades 20 and shaping lifting plate 21 inserted into the soil advance, the soil 1 inside this series of shaping cutter blades 20 is lifted by the shaping lifting plate and then lowered again after the shaping cutter blades pass, thereby forming an approximately V-shaped crushed soil 2 in a front view of FIG. 6(a), as shown by the horizontal hatching in the figure. This crushed soil 2 is loose and soft, allowing the liquid fertilizer 30 to easily penetrate within that range.

[0017] The liquid fertilizer application device M can also handle buried objects when applying to deep layers of the soil. Buried objects such as stones up to a certain size can pass inside the approximate V-shape formed by the two shaping cutter blades 20. The liquid fertilizer application device M also has a mechanism that breaks a safety pin (not shown) when the shaping cutter blades 20 or shaping lifting plate 21 collide with a large object, causing the shaping cutter blades 20 and shaping lifting plate 21 to rise 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 equipped with one to three successive soil cutting units 25. Figure 2 shows, as an example, a liquid fertilizer application device M equipped with three successive soil cutting units 25. When multiple successive soil cutting units 25 are provided, they can be arranged at any intervals.

[0019] The three-point linkage connection frame 12 and the profile cutting blade frame 14 are also rotatably connected via a hydraulic cylinder 13. This hydraulic cylinder 13 can be operated using the tractor's hydraulic system, and its extension and contraction changes the angle of the profile cutting blade frame relative to the three-point linkage frame, which means that the inclination of the profile cutting blade frame 14 relative to the soil surface can be adjusted. This operation adjusts the depth of the profile cutting blade 20 inserted into the soil and the lifting up of the blade from the soil. The construction depth can be adjusted within a range of 0 to 50 cm by adjusting this hydraulic cylinder 13.

[0020] A liquid fertilizer tank frame 16 is fixed to the top of the shaping cut-off blade frame 14. A liquid fertilizer tank 17 for storing liquid fertilizer 30 is fixed to the top of the liquid fertilizer tank frame 16. For example, as shown in Figure 2, one liquid fertilizer tank 17 can be provided on each side when viewed from the front. There are no particular restrictions on how the liquid fertilizer tank 17 is fixed to the liquid fertilizer tank frame 16, as long as it can withstand the vibrations of agricultural work, but it is preferable that the liquid fertilizer tank 17 itself be installed so that it can be attached and detached. The liquid fertilizer 30 refers to a liquid such as a slurry liquid of excrement, which is livestock waste, a fermented digestate liquid, or a prepared 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. The liquid fertilizer insertion pipes 37 are preferably fixed around the periphery of each shaping cutting blade 20. In this case, two liquid fertilizer insertion pipes 37 are provided for one series of soil cutting sections 25, and six liquid fertilizer insertion pipes 37 are provided for three series of soil cutting sections 25 (see FIG. 2). By adjusting the position of the shaping cutter blade frame 14 or the soil cutting portion 25 using the hydraulic system described above, the position of the liquid fertilizer insertion pipe 37, which is provided in a fixed position relative to the shaping cutter blade 20, is also adjusted.

[0022] When the liquid fertilizer application device M is towed by a tractor and moves forward, the soil cutting section 25 moves through the soil 1, crushing the soil into an approximately V-shape, and at the same time, liquid fertilizer 30 in the liquid fertilizer tank is applied into the crushed soil 2 through a liquid fertilizer insertion pipe 37. By applying liquid fertilizer 30 from the liquid fertilizer insertion pipe 37 into the gaps in the loose soil in the crushed soil 2, the liquid fertilizer 30 can be completely buried so that it is not exposed to the surface of the soil 1, i.e., not exposed to the air, and ammonia, a nitrogen fertilizer component, is not volatilized into the atmosphere, which increases the utilization rate of the nitrogen fertilizer.

[0023] For example, when the soil cutting part 25 is inserted into the soil to a depth of 50 cm, the distance between the two V-shaped cutting blades 20 near the ground surface is about 60 cm, and each cutting blade 20 itself forms a groove (gap) about 5 cm wide in the soil to a deep layer. The formation of soft, loose crushed soil 2 of this size when viewed from the front (perspective of Figure 2) increases the upper limit of the application amount. The area of ​​the crushed soil 2 formed in this way, ranging from 1 cm to 50 cm deep, becomes the liquid fertilizer deep application area. The approximately 5 cm grooves (gaps) formed on both sides of the liquid fertilizer deep application area can be used to apply liquid fertilizer 30 into the crushed soil 2. By adjusting the soil cutting section 25 to one to three rows, it becomes possible to apply liquid fertilizer 30 into the soil at a rate of up to 20 t / 10 a.

[0024] In order to distribute liquid fertilizer 30 from the liquid fertilizer tank 17 to multiple 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 pipes 37 (see Figures 1 and 2).

[0025] The liquid fertilizer distributor 31 will be described with reference to Figure 3. As shown in Figure 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 liquid fertilizer 30 connecting the liquid fertilizer distributor 31 and the liquid fertilizer tank 17 (see Fig. 1(a) and Fig. 3(b)). The transport pipe 32 is connected to a hole opened in 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 its own weight. At this time, the distribution container lid 63 and the distribution container 60 are tightly sealed with, for example, a distribution container lid fastener 64 to prevent the liquid fertilizer 30 from leaking from the distribution container 60.

[0026] As shown in Figure 3(a), the interior of the distribution container 60 is equipped with a rotating shaft 66 rotatable by a motor 65 (see Figures 1(a) and 3(b)) provided on the underside of the distribution container 60, a plurality of holes 62 provided in the bottom surface 61 at equal angular intervals around the rotating shaft 66 and equidistant from the rotating shaft, a plurality of distribution plates 68 extending from the rotating shaft 66 to near the inner surface of the distribution container 60 and dividing the interior of the distribution container 60 evenly, and a distribution plate blade 67 provided on the vertical upper side of each distribution plate 68, i.e., on the edge on the liquid fertilizer inlet 69 side. The distribution plates 68 and distribution plate blade 67 may be fabricated integrally or as separate members. It is preferable that the number of distribution plates is equal to the number of holes 62. More preferably, the number of holes 62 is equal to the number of liquid fertilizer insertion pipes 37.

[0027] Each distribution plate 68 is disposed 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, the side surface of the distribution plate 68 can be seen in a plan view as shown in Figure 3(a).

[0028] The liquid fertilizer distributor 31 and the liquid fertilizer insertion pipe 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 Figure 3(b).

[0029] As the rotating shaft 66 rotates, the distribution plate 68 rotates, and the angled distribution plate blades 67 cut off impurities in the liquid fertilizer 30 injected from the liquid fertilizer injection port 69, and this rotation action causes an even amount of liquid fertilizer 30 to flow into the distribution container 60 separated by the distribution plate, and then into each liquid fertilizer distribution hose 36 through each hole 62 in the bottom surface 61.

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

[0031] In the example shown in FIG. 3(a), six holes 62 are provided, and six distribution plates 68 divide the internal space of the distribution container 60 into six compartments. In this case, it is assumed that the distribution container 60 will be used primarily for six liquid fertilizer insertion pipes 37 installed on each shaping cutting blade 20 of a triple soil cutting unit 25, as shown in FIG. 2. As a variation of this, the example shown in FIG. 4(a) shows an example in which four holes 62 are provided, and four distribution plates 68 divide the internal space of the distribution container 60 into four compartments. In this case, it is assumed that the distribution container 60 will be used primarily for four liquid fertilizer insertion pipes 37 installed on each shaping cutting blade 20 of a dual soil cutting unit 25. As another variation, the example shown in FIG. 4(b) shows an example in which two holes 62 are provided, and two distribution plates 68 divide the internal space of the distribution container 60 into two compartments. In this case, it is assumed that the distribution container 60 will be used primarily for two liquid fertilizer insertion pipes 37 installed on each shaping cutting blade 20 of a single soil cutting unit 25.

[0032] The liquid fertilizer distributor 31 itself can be widely used in devices that distribute liquid fertilizer containing impurities to a plurality of pipes, and can be used regardless of the scale of the device.

[0033] The liquid fertilizer application device M includes a valve 40 for enabling start / stop of supply of liquid fertilizer 30 injected from the liquid fertilizer tank 17 to the liquid fertilizer distributor 31 as shown in FIG. By adjusting the degree of opening or closing of this valve, for example, to fully open, 3 / 4, half open, or 1 / 4, the flow rate of the liquid fertilizer 30 to be injected can be adjusted. The mechanism for opening and closing the valve can be provided so as to be operable manually, by extension and contraction of a hydraulic cylinder, by an electric valve (shutter type), or by a combination thereof. In addition, in order to apply fertilizer at an appropriately planned amount, the flow rate of the liquid fertilizer may be adjusted, for example, not by adjusting a valve but by adjusting the traveling speed of the tractor towing the liquid fertilizer application device M.

[0034] In the following, several embodiments will be described regarding the position where the liquid fertilizer insertion pipe 37 is arranged. In one embodiment, as shown in Figures 1 and 5, the liquid fertilizer insertion pipe 37 can be arranged along the rear side of the two shaping cut-off blades 20 that form a roughly V-shape. The liquid fertilizer insertion pipe 37 may be arranged along the shaping cut-off blades 20 so as to be in contact with them, or may be arranged along the shaping cut-off blades 20 with a gap as shown in Figure 1(a). However, it is desirable that their relative positions be fixed when applying liquid fertilizer. In particular, it is desirable that the liquid fertilizer insertion pipe 37 be fixed so that the depth of the outlet 38 at the tip in the soil does not change when applying liquid fertilizer. To securely position the liquid fertilizer insertion pipe 37, a fixing member 39 provided on the molded cutting blade holder 15 may be used, as shown in Figures 5(b) and 5(c). It is sufficient that the liquid fertilizer insertion pipe 37 is placed in a stable position even during agricultural work, and the fixing member may be provided in another location, or another fixing method may be used. The manner or method of arranging the liquid fertilizer insertion pipe 37 along the shaping cutter blade 20 and the fixing member 39 are common to other embodiments described later.

[0035] When the liquid fertilizer application device M is towed by a tractor and moves forward, the shaping cutter blades 20 move through the soil 1 to the left as viewed in Fig. 5(b) and towards the front as viewed in Figs. 5(a) and 6. As shown in Fig. 6, the soil 1 inside the two shaping cutter blades 20 that form a roughly V shape becomes crushed soil 2. Liquid fertilizer 30 flowing out from a liquid fertilizer insertion pipe installed behind the shaping cutter blades 20 can be applied to the gaps in the soil 1 where the shaping cutter blades 20 themselves have passed.

[0036] 6(b) shows the state of the roughly V-shaped crushed soil 2 after the liquid fertilizer 30 has been applied according to this embodiment. Because the liquid fertilizer 30 is completely buried in the soil, the volatilization of ammonia and other major fertilizer components that are prone to volatilization can be suppressed.

[0037] In another embodiment, as shown in Fig. 7, the liquid fertilizer insertion pipe 37 can be arranged along the inside of the two shaping cutter blades 20 that form a roughly V-shape. In this case, as shown in Fig. 8, the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe 37 can flow down the shaping cutter blades 20 due to surface tension and be applied to the lower part of the crushed soil 2.

[0038] In another embodiment, as shown in Figure 9, the liquid fertilizer insertion pipe 37 can be arranged along the outside of the two shaping cutter blades 20 that form a roughly V shape. In this case, as shown in Figure 10, the liquid fertilizer 30 flowing out from the liquid fertilizer insertion pipe 37 can flow down the shaping cutter blades 20 due to surface tension and be applied to the lower part of the crushed soil 2.

[0039] In yet another embodiment, as shown in Figure 11, the liquid fertilizer insertion pipe 37 can be positioned so that when the soil cutting portion 25 is inserted into the soil, the outlet 38 at the tip of the liquid fertilizer insertion pipe 37 faces perpendicularly to the side of the part of the shaped cutting blade 20 that is not inserted into the soil. As shown in Figure 11(a), the side of the shaped cutting blade 20 may be either the inside or outside of the shaped cutting blade 20 that forms an approximately V-shape when viewed from the perspective of the figure. In this case, the liquid fertilizer 30 flowing out of the liquid fertilizer insertion pipe 37 collides with the side of the shaping cutter blade 20 as shown in Fig. 11(a), and the liquid fertilizer is scattered and scattered as shown in Fig. 11(b). The liquid fertilizer 30 can easily penetrate into the crushed soil 2, which has become loose and soft.

[0040] The liquid fertilizer application device M as an integrated working machine equipped with the above-mentioned components, especially the liquid fertilizer tank, has a connection and size that allows it to be towed by a small tractor, ensuring the overall machine's drivability. This allows liquid fertilizer such as livestock manure slurry or digested liquid to be applied without using a tank truck. In addition, the shaping cutter blade 20 forms a soft, loose, crushed soil 2 with numerous cracks that are roughly V-shaped when viewed from the front (as seen in Figure 2), and this is laid down over a wide area down to the deep layers of the soil. The crushed soil 2 that is continuously formed by the movement of the liquid fertilizer application device M allows liquid fertilizer to be applied not only to deep layers but also in large quantities.

[0041] As described above, the application of fertilizer into the soil by the liquid fertilizer insertion pipe 37 arranged along the side of the shaping cutter blade 20 allows effective application to deep layers. Fertilization using the liquid fertilizer application device M prevents the liquid fertilizer 30 from being exposed to the surface, and prevents the ammonia volatilization and runoff of the liquid fertilizer 30, which causes a foul odor. This prevents not only surface exposure when a large amount of liquid fertilizer is applied, but also uneven distribution of the liquid fertilizer due to the topography, and as a result, it is possible to apply a large amount of liquid fertilizer to the soil and apply it in a uniform amount. Since the liquid fertilizer application device M is provided with a three-point link connection frame 12 that can be connected to an existing tractor, and an existing liquid fertilizer tank 17 can be used, the present invention can be implemented relatively inexpensively.

[0042] The above disclosure can also be understood as an invention of a method for applying liquid fertilizer 30. That is, the method involves towing the liquid fertilizer application device M, which is integrally provided with the above-mentioned components, with a tractor, causing the soil cutting section to advance in the ground, forming a roughly V-shaped loose soil inside, and applying the liquid fertilizer 30 in the liquid fertilizer tank 17 to the loose soil through the liquid fertilizer insertion pipes 37, which are arranged along the side of each shaping cutter blade or along the rear side opposite to the direction of advancement. By using the liquid fertilizer distributor 31 described above in this liquid fertilizer application device M, impurities in the liquid fertilizer 30 are cut off, and an equal amount of liquid fertilizer 30 flows into each liquid fertilizer insertion pipe 37 .

[0043] [Example 1] Examples of the present invention are given below. A deep soil application area of ​​liquid fertilizer 30 was set up assuming a liquid fertilizer application device M (see Figure 5) in which a liquid fertilizer insertion pipe 37 was installed behind the shaping cutter blade 20. The distribution of ammonia nitrogen in the soil during deep soil application was measured, and the results of the cross-sectional distribution diagram of the components are shown in Figure 12. The test conditions are as follows: Test date: March 29, 2023 Test location: Kuroboku soil field at the Rural Engineering Research Department, Tsukuba City, Ibaraki Prefecture Tractor used: Kubota SMZ76 76 horsepower half crawler tractor · Work equipment used: For the test trial, a small liquid fertilizer application device M having three roughly V-shaped shaping cutting blades 20 was used, and test application was carried out with each shaping cutting blade 20 inserted to a depth of 40 cm. Liquid fertilizer used: Methane fermentation digestate (livestock manure) Ammonia nitrogen concentration: 0.17% Application treatment: Subsurface application using the liquid fertilizer application device M according to the present invention · Application amount: 8t / 10a Chemical fertilizer (nitrogen equivalent): 13.6 kgN / 10a

[0044] As shown in Figure 12, the concentration of ammonia nitrogen in the soil application area of ​​this example was higher the deeper the layer, and even in the surface layer at a depth of 0 to 10 cm, liquid fertilizer 30 was applied underground without being exposed. Also, it was found that the ammonia component did not move from the application area to the surrounding area immediately after application, but was retained in the application area.

[0045] [Example 2] A deep soil application area of ​​liquid fertilizer 30 was set up assuming a liquid fertilizer application device M (see Figure 9) in which a liquid fertilizer insertion pipe 37 was installed outside the shaping cutter blade 20. The amount of ammonia gas volatilized from the ground surface after liquid fertilizer application was measured, and the results are shown in Figure 13 as the ammonia gas volatilization rate. The test conditions are as follows: Test date: March 29, 2023 Test location: Kuroboku soil field at the Rural Engineering Research Department, Tsukuba City, Ibaraki Prefecture Tractor used: Kubota SMZ76 76 horsepower half crawler tractor Liquid fertilizer used: Methane fermentation digestate (livestock manure) Ammonia nitrogen concentration: 0.17% Application treatment: 1) Subsurface application using the liquid fertilizer application device M according to the present invention 2) Conventional method of surface spraying on the ground surface Application rate: 8t / 10a (same amount for both subsurface and surface application) Chemical fertilizer (nitrogen equivalent): 13.6 kgN / 10a

[0046] As shown in Figure 13, the ammonia gas volatilization rate in the subsurface application area where the liquid fertilizer was 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 subsurface and completely sealing it with soil.

[0047] [Comparative Example 1] FIG. 14 shows the cross-sectional distribution of components obtained by measuring the distribution of ammonia nitrogen in the soil after liquid fertilizer 30 is sprayed on the ground surface, assuming conventional surface spraying. The test conditions are as follows: Test date: March 29, 2023 Test location: Kuroboku soil field at the Rural Engineering Research Department, Tsukuba City, Ibaraki Prefecture ·Application method: Hand application Liquid fertilizer used: Methane fermentation digestate (livestock manure) Ammonia nitrogen concentration: 0.17% Application location: Surface spraying on the ground surface Application rate: 8t / 10a (same amount for both surface and subsurface application) Chemical fertilizer (nitrogen equivalent): 13.6 kgN / 10a

[0048] As shown in Figure 14, the area with the highest concentration of ammonia nitrogen in conventional surface application was the surface layer, 0 to 10 cm deep, with most of it being on the surface. Immediately after application, there was no movement of nutrients to the lower layers, creating conditions that made it easy for ammonia gas to volatilize.

[0049] As shown in Figure 13, the ammonia gas volatilization rate in the surface application area using the conventional method was high after application and, although it gradually decreased, continued for a relatively long time. As long as liquid fertilizer 30 was present on the ground surface, ammonia gas volatilization continued, contributing to the reduction of nitrogen components.

[0050] The combination of the arrangement of the liquid fertilizer insertion pipes or the arrangement of each shaping cutter blade 20, the relative arrangement of each component in the liquid fertilizer application device M, the piping method between each component, the piping material, the method of fixing the liquid fertilizer insertion pipe 37, the method of fixing the liquid fertilizer tank, the size of the tank, etc. are all examples and do not limit the content of the invention 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, any combination of the descriptions thereof is also considered to be within the disclosed scope as long as it is included in the description of the claims. [Explanation of symbols]

[0051] 1. Soil 2. Crushed soil 10 Top link connection 11 Lower link connection 12 Three-point linkage frame 13 Hydraulic cylinder 14 Molded cutting blade frame 15 Forming cutting blade holder 16 Liquid fertilizer tank frame 17 Liquid fertilizer tank 20 Molded cutting blade 21 Molded lifting board 25 Soil cutting section 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 valves 60 dispensing container 61 bottom 62 holes 63 Dispensing container lid 64 Dispensing container lid fastener 65 motor 66 Rotation axis 67 Distribution plate blade 68 Distribution plate 69 Liquid fertilizer inlet 70 Container window M Liquid fertilizer application device F forward R rear

Claims

1. A liquid fertilizer distributor for distributing liquid fertilizer supplied from a liquid fertilizer tank to a plurality of liquid fertilizer insertion pipes, The apparatus comprises 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, a plurality of holes provided on the bottom surface at equal angular intervals around the rotating shaft and equidistant from the rotating shaft, a plurality of distribution plates extending from the rotating shaft to the vicinity of the inner surface of the distribution container and dividing the inside of the distribution container evenly, and distribution plate blades provided on the vertical upper edge of each of the distribution plates, A liquid fertilizer distributor 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.

2. 2. The liquid fertilizer distributor according to claim 1, wherein the number of the holes is equal to the number of the distribution plates.

3. The liquid fertilizer insertion pipe communicates with the hole, A liquid fertilizer distributor as described in claim 1 or 2, characterized in that the liquid fertilizer insertion pipe is fixed around the periphery of an approximately V-shaped cutting blade provided on a liquid fertilizer application device that is towed by a tractor and applies liquid fertilizer to a field.

4. The liquid fertilizer insertion pipe is arranged along the shaping cutting blade at a position inside, outside, or rear side opposite to the traveling direction of the substantially V-shaped shaping cutting blade, or a combination thereof; and A liquid fertilizer distributor as described in claim 3, characterized in that when the shaped cutting blade is inserted into the soil, the outlet of the liquid fertilizer insertion pipe, which is the outlet for the liquid fertilizer, is positioned in the soil.

5. A liquid fertilizer distributor as described in claim 3, characterized in that when the shaped cutting blade is inserted into the soil, the outlet of the liquid fertilizer insertion pipe is arranged perpendicular to the side of the part of the shaped cutting blade that is not inserted into the soil.

6. A method for applying liquid fertilizer to the soil by towing a liquid fertilizer application device which integrally comprises a liquid fertilizer tank, a liquid fertilizer insertion pipe connected to the liquid fertilizer tank via a liquid fertilizer distributor as described in claim 1 or 2, a soil cutting unit having a shaping lifting plate and two shaping cutting blades connected in an approximately V shape via the shaping lifting plate, and a frame to which the soil cutting unit is fixed at the bottom and the liquid fertilizer tank is fixed at the top and which is detachably connected to the tractor, the method comprising: towing the liquid fertilizer application device by a tractor, causing the soil cutting unit to advance through the soil, forming approximately V-shaped, loose soil inside the soil cutting unit, and applying liquid fertilizer to the loose soil from the liquid fertilizer insertion pipe which is arranged along the side of each shaping cutting blade or along the rear side opposite to the direction of advancement of the blades.

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