JP2001275544A - Covering machine for both chemical agent injection and ridging and method for disinfecting soil therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covering machine which is used for both chemical agent injection and ridging, can sufficiently utilize the original advantages of a partially soil disinfection method and is extremely preferable from the aspect of enviromnental protection, and to provide a method for disinfecting soil by the use of the machine. SOLUTION: This covering machine 100 which is useful for both chemical agent injection and ridging, is attached to a tractor and pulled, and is used for injecting a chemical agent P as points C in soil, ridging soil tilled with an attached rotary 3, and then covering the formed ridge with a mulching film 5, characterized in that an injection sword 80 for injecting the chemical agent into the soil is attached so that the tip of the injection sword 80 reaches soil B at a deeper position than the tilled soil in the ridge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art Generally, diseases in which pathogenic bacteria survive in soil for a long period of time, infringe on the stems and petiole of the crop and the roots in the soil, causing the crop to die, and causing quality deterioration and loss of yield. It is called soil disease. One of the means for controlling this soil disease is soil disinfection using a soil fungicide.

In general, chlorpicrin is used as a fungicide frequently used for soil disinfection in tobacco cultivation. This fumigant is a colorless and transparent liquid, easily gasifies in air, and exhibits strong tearing and mucosal irritation. For this reason, when soil disinfection is performed using such fumigants, the ground immediately after the injection of the chemical is covered with a polyethylene film, etc., in order to prevent diffusion to the atmosphere around the ground to ensure safety. ing.

One of the methods for disinfecting soil using a chemical such as a chlorpicrin agent is a full-scale disinfection method in which a chemical is applied to the entire cultivated soil in the ground to disinfect the soil. Although this disinfecting method is effective, it has disadvantages such as a high material cost due to the large amount of drug used per unit area and the need to cover the entire land with a covering material.

[0004] As another disinfection method, there is a partial disinfection method in which the soil in the furrow is disinfected simultaneously with the furrow covering of the cultivated soil cultivated by a rotary. According to this method, the amount of drug used per unit area is reduced compared to the total disinfection, and the amount of coating material can be reduced because only the ridge surface is covered rather than the entire land. It has the advantage of being economical. As a disinfecting machine for performing such partial disinfecting, a ridge simultaneous simultaneous soil disinfecting machine for tractors as shown in FIG.
-112204).

This device comprises a machine frame 2 mounted on a tractor 1, a rotary 3 connected to a PTO shaft of the tractor 1,
A ridge setting device 5 for forming the ridge 4 and a film coating device 7 for coating the multi-film 6 on the ridge 4 are provided. Immediately before the rotary 3, an injection knife 8 is arranged in a state where the tip is almost in contact with the surface of the cultivated soil. Have been. Then, the medicine in the medicine tank 10 is sprayed or dropped on the surface of the cultivated soil immediately before being plowed by the rotary 3 from the pipe 9 arranged on the back surface of the injection knife 8 by the operation of the pump 11. . The sprayed or dropped chemicals are mixed into the cultivated soil by tilling on the rotary 3. Then, the cultivated soil mixed with the chemical is turned into ridges 4 by the ridger 5, and the surface thereof is covered with the multi-film 6 by the film coating device 7.

[0006]

The partial disinfection method in which a chemical is sprayed at the same time as the tillage ridge by the rotary is used because the chemical can be effectively mixed into the ridge, so that the amount of the drug used per unit area is compared with the full disinfection method. There is an advantage that weight is reduced. However, agents such as chlorpicrin are volatile and readily diffuse into cultivated soil, but are less likely to penetrate into hard soil below. Therefore, the required soil disinfection proceeds in the ridged cultivated soil, but the disinfection is not sufficiently performed in the hard soil layer below the cultivated soil. Further, in the case of a highly volatile chemical, after spraying or dripping on the cultivated soil surface, before the ridge is covered with the multi-film, it may be partially gasified and released into the atmosphere.

[0007] By the way, depending on the crop, for example, in the case of a crop such as tobacco, its roots may extend not only in the ridged soil but also in the lower part of the soil. When the above-mentioned partial disinfection method is applied to such crop fields, the roots extend from the disinfected soil (raised arable soil) to the lower undisinfected part. Things can happen. In that case, the pathogenic bacteria remaining there will invade the crop body through the growing roots, and as a result, diseases will occur despite disinfection,
This can cause quality degradation and loss of revenue.

In view of the above, in order to ensure the effect of partial disinfection, the actual amount of the drug used per unit area is usually larger than the prescribed amount. It is not to take full advantage of its original advantages. Also, using a larger amount of drug is not preferable from the viewpoint of environmental protection.

[0009] The present invention has been made in view of the above-mentioned circumstances, and is an embodiment that can fully utilize the original advantages of the partial soil disinfection method and is also extremely preferable from the viewpoint of environmental conservation. It is an object of the present invention to provide a chemical injection and furrowing covering machine and a soil disinfection method using the same.

[0010]

According to the present invention, there is provided a pharmaceutical injection and ridge covering machine according to the present invention for solving the above-mentioned problems. Is a chemical injection and ridge covering machine that lays the soil cultivated in the ridge and covers it with multi-film, and the injection sword that injects the chemical into the soil has a tip whose soil is deeper than the cultivated soil in the ridge. It is characterized by being attached so as to reach the layer.

The soil disinfecting method according to the present invention is a soil disinfecting method in which the above-mentioned chemical injecting and rowing covering machine is mounted on a mobile agricultural machine and the soil is continuously disinfected while being pulled by the mobile agricultural machine. Before cultivating with a rotary, a required chemical is injected into the soil layer deeper than the cultivated soil in the ridge cultivated with the rotary and raised at predetermined intervals by an injection knife.

According to the invention, the pouring sword is inserted into a hard soil layer at a position deeper than the cultivated soil to be plowed by a rotary, and the soil layer is crushed by the pouring sword and preferably a blade attached to the tip thereof. Meanwhile, a chemical such as a fumigant is injected into a deep position. The injected chemical gradually rises while diffusing and volatilizing in the hard soil layer, and finally penetrates and fills the ridged and film-covered ridge soil. Therefore, even if a highly volatile chemical is used, not only can it be reliably prevented from escaping into the air immediately after injection, but also the desired disinfection action can be achieved even in soil layers deeper than the cultivated soil in the ridge. proceed. The desired disinfection action in the cultivated soil in the ridge covered with the film naturally also proceeds.

[0013] For this purpose, in the lands where the partial disinfection according to the present invention has been performed, the crops are not limited to cultivated soil such as tobacco, but their roots extend to the lower part of the cultivated soil. In the case of cultivation, it is possible to effectively prevent the invasion of the pathogenic bacteria into the crop body via the roots, and it is possible to avoid the deterioration of the quality of the crop and the decrease in the yield due to the pathogenic bacteria. In addition, since the entire amount of the injected drug acts on soil disinfection, a large disinfection effect can be expected with a small amount of the drug, and environmental safety can be ensured.
In addition, it is possible to extend the range of the disinfection effect with an amount equal to or less than the used amount per unit area by the conventional disinfecting machine.

In the present invention, the drug used is not particularly limited, and chlorpicrin, carbam, DD chloropicrin, methyl bromide chloropicrin, methyl isothiocyanate, DD methyl isothiocyanate, Chlorpicrin / DCIP agent or D-
The present invention is particularly effective for a drug having a high volatility such as a chlorpicrin-based drug, although it may be a drug such as a D agent.

Preferably, the drug injection and furrow coating machine according to the present invention further comprises a sensing wheel that rotates along the furrow and a control device that controls the timing of injecting the drug. The control device outputs a balloon signal by a signal. Thereby, it becomes easy to inject the medicine at regular intervals along the ridge, and a more reliable and high disinfection effect can be obtained.

[0016] More preferably, in the medicine injection and furrow-up machine according to the present invention, two infusion swords are provided for the width of the furrow, and the control device is configured such that the two infusion swords alternately eject the medicine. And an injection signal is issued. This enables disinfection of wider ridges and the underlying soil layer with a smaller amount of drug.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, referring to the drawings, a description will be given of a chemical injection and ridge covering machine and a soil disinfection method using the same according to the present invention. FIG. 1 shows a state in which a drug injection and furrow coating machine 100 according to the present invention is mounted on a tractor 1, and FIG. 2 shows a state in which the coating machine 100 is viewed from the front side. In the chemical injection and ridge coating machine 100, the machine frame 2 mounted on the tractor 1 has a rotary 3 connected to the PTO shaft of the tractor 1, a ridge device 5 for forming the ridge 4, and a multi-film on the ridge 4. 6 is provided with a film coating device 7 for coating. The machine frame 2, the rotary 3 as a tillage device, the ridge device 5, the multi-film covering device 7
And the like may be the same as those of the related art shown in FIG. 10. Members having the same functions are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, in the illustrated example, a mounting table 50 for the medicine tank 10 and a pump 1 for ejecting the medicine are mounted on the machine frame 2.
1 and the like, and a control device 71 for each working unit is arranged near the driver's seat of the tractor 1.

The above-mentioned medicine injecting and furnishing machine 100 is mounted on the tractor 1 by using a pin 72 with a three-point hitch aligned with a three-point link at the rear of the tractor, and power transmission to the rotary 3 is performed by a PTO at the rear of the tractor. It is transmitted from the shaft to the input shaft via a joint joint. As shown in FIGS. 4 and 5, the cultivated soil A is cultivated by the rotary 3 from the ground surface GL to a predetermined depth H by the traveling of the tractor 1, and is formed as a ridge 4 having a height Ha by the ridge device 5. The multi-film 6 is coated thereon by the film coating device 7. This operation is the same as the conventional one.

The medicine injection and furrowing coater 10 according to the present invention.
0, the machine casing 2 is provided with a sensing wheel 60 for obtaining the injection timing of the medicine, and as described later,
The action of the sensing wheel 60 and the control device 71 sets the injection timing of the medicine.

As shown in FIG. 2, a horizontal support rod 2a located forward of the rotary 3 in the machine frame 2 includes
A plurality of injection sword mounting brackets 51 are mounted so as to be capable of changing the position in the horizontal direction and fixed freely, and a mounting plate 53 having a large number of mounting holes 52 in the vertical direction is welded to the mounting bracket 51.

As shown in FIG. 3, the injection knife 80 includes a vertical rod 81 having a predetermined length, and a triangular blade-shaped blade 82 welded and fixed to the lower end of the vertical rod 81. Are formed with a number of holes 82 corresponding to the mounting holes 52 formed in the mounting plate 53 of the injection knife mounting bracket 51. On the back side of the vertical rod 81, a pipe 9 connected to the pump 11 arranged in the machine frame 2 is fastened, and the medicine in the medicine tank 10 is ejected from a nozzle 91 attached to the lower end thereof.

With the above configuration, the injection knife 80 can be fixed to the injection knife fixing bracket 51 by changing its height by a certain distance in the vertical direction. In addition, since the injection knife fixing bracket 51 can be fixed to an arbitrary position of the horizontal support rod 2a, the mounting position of the injection knife 80 in the lateral direction can be adjusted.
Thereby, the penetration depth of the injection sword 80 into the harder soil layer B below the cultivated soil A, and the lateral position and interval for injecting the chemical can be adjusted. In addition, if a large number of injection sword fixing brackets 51 and injection swords 80 are prepared, a larger number of injection swords 80 can be attached to the horizontal support rod 2a.

As shown in FIGS. 4 and 5, in the medicine injection and furrowing coater 100 of the present invention, the injection knife 80 is used.
The tip (the blade 82) penetrates into a hard soil layer B (not plowed by the rotary 3) lower than the cultivated soil A plowed by the rotary 3 by a predetermined depth D (for example, about 10 cm). It is attached so that it does. As the tractor 1 travels, the injection knife 80 is moved to a depth H by its leading edge and a blade 82 fixed to the tip.
And the hard soil layer B having the depth D is crushed. Thereby, the soil layer near the tip is somewhat softened by the blade 82. With the progress of tractor 1,
From the nozzle 91 of the pipe 9 attached to the back side of the injection knife 80, the medicine from the medicine tank 10 is injected at predetermined intervals into a part softened by the blade 82 (shown by a point C in FIG. 4). Is). In FIG. 5, only one injection knife 80 is shown together with the ridge 4 for the sake of simplicity, but in the case of the embodiment shown in FIG. Will be done.

Next, the sensing wheel 60 for obtaining the injection timing will be described. As shown in FIG. 6, the sensing wheel 60 includes a mounting portion 61 to the machine frame 2, a support rod 62 having one end pivotally or fixed to the mounting portion 61, and a rotation rod mounted to the other end of the support rod 62. A wheel 63, and a cam 6
4 is installed. In this example, as shown in FIG. 6B, the cam 64 has two detectors 65 with a phase difference of 90 degrees.
a, 65b, and the detecting units 65a, 65b.
and a transmitting unit 66 for transmitting a signal from the controller b to the controller 71 as an electric signal. Further, in this example, the outer diameter of the rotating wheel 63 is set to have a circumferential length twice as long as the set injection interval. Therefore, two electric signals are transmitted to the control device 71 in one rotation of the rotating wheel 63, and the control device 71 supplies an injection signal to the pump 11.

By changing the outer diameter of the rotating wheel 63,
A signal at an arbitrary injection interval can be obtained. Also,
As shown in FIG. 2, in the case where two injection knives 80 are arranged to perform the double-row processing, one of the signals from the cam 64 is used as an injection signal for one of the injection knives 80 and the other is used for the other injection. By using the signal as the injection signal of the sword 80, the medicine can be alternately and staggered injected from the tip of each injection knife as shown in FIG.

FIG. 8 shows a medicine tank 10 and a medicine P therefrom.
Shows a suction port 92 of the pipe 9 for sucking air. The suction port 92 includes a check valve including a spring 94 and a ball 95 in a casing 93. Thereby, when the pipe 9 is lifted for the exchange of the medicine, it is possible to prevent the liquid from dripping from the suction port 92, and the safety is secured. In addition, this check valve can also prevent air from entering the inside of the pipe 9 at the time of drug exchange, so that the air inside the pipe is compressed during the suction / injection operation of the pump 11 and the injection amount becomes uneven. Can also be eliminated. Although not shown, the medicine tank 10 is slightly inclined forward so that the medicine is not spilled when the working machine is raised and the remaining liquid in the medicine tank 10 can be used without waste when the work machine is lowered, so that it is easy to collect on one side. It is preferred to mount at an angle.

Further, in the above embodiment, the pump 11
Although attached to the machine frame 2 on the rotary 3, the attachment position is arbitrary. Further, as a method for obtaining the injection timing, a method in which the sensing wheel 60 rolls on the leveled ground, a method for obtaining a constant interval using a resistor, and the like can be adopted. However, there is a problem that the sensing wheel that rolls on the leveling surface is easily affected by irregularities on the leveling surface and it is difficult to keep a constant interval, and the method of obtaining with a resistor is not able to follow changes in the tractor's working speed and adjustment The method described with reference to the above drawings is recommended because the trouble is a problem.

Next, the operation of the medicine injection and furrow coating machine according to the present invention will be described. First, the coating material (multi-film 6) and the chemical tank 10 are installed on the machine frame 2, and the suction port 92 of the pipe 9 is inserted deep into the chemical tank 10. At this time, the tip of the suction port 92 is
Insert into the deepest part of the slant so that the medicine can be used up without waste. Further, the injection amount of the pump 11 is set, and the set value is input to the counter of the driver's seat.

Next, the tractor 1 is advanced into the ground, and the chemical injection and ridge covering machine 100 is lowered, and the injection sword 80, the blade 82 at its tip and the rotary 3 are advanced into the soil. At this time, the end of the multi-film 6 is buried at the end of the ridge so that the ridge work can be performed, and the tractor 1 is appropriately advanced and temporarily stopped. When the sensing wheel 60 is lowered on the surface of the ridge 4 covered with ridges or trapezoids and the operator turns on the main switch of the disinfection machine pump 11, preparations before the operation are completed.

Thereafter, the tractor 1 is advanced to perform the ridge covering disinfection operation. While the tractor 1 is in progress, the sensing wheel 60 rolls on the ridge surface covered with the ridge, and the medicine P of the dose set from the pump 11 in accordance with the above-described injection timing is injected at a constant interval from the tip of the injection knife 80. (Point C). Immediately after the drug P is injected, it is plowed to form the ridge 4 and the multi-film 6 is covered. For this reason, even if the chemical | medical agent P gasifies, it is safe without rapidly diffusing into the surrounding environment.

The operator confirms whether the pump is operating normally by using a pump operation confirmation lamp installed in front of the driver's seat. In addition, the remaining amount in the medicine tank 10 is confirmed by a counter and a buzzer on the driver's seat, and is used as a guide for replacement. For example, a value obtained by dividing the capacity of the medicine tank by the injection amount per location is input to the counter, and the buzzer sounds when the set value is reached. As a result, it is possible to obtain an indication for replacing the next medicine. If the set value of this counter is set to a value obtained by dividing the length per one of the multi-films 6 by the injection interval, it can be used as a standard for confirming the remaining amount of the multi-film 6.

Thereafter, when reaching the end of the ridge, the operator turns off the pump 11, raises the chemical injection and ridge coating machine 100, and ends the work process for one ridge when the multi-film 6 is cut. . Hereinafter, the same operation is sequentially performed, and the ridge covering and disinfecting operation of the entire land is continued.

Next, an example of actual soil disinfection performed by the present inventors will be described in comparison with a conventional method. For comparison, the land of Ando soil with a high bacterial density of tobacco take-all (10 ³ to 1) was used.
0 ⁴ cfu / g) were selected. As a test plot, a non-treatment plot (FIG. 9a), a fungicide-treated plot by a conventional method (FIG. 9b),
In addition, a treatment section (FIG. 9c) for soil disinfection was provided by using the chemical injection and furrowing up machine according to the present invention, and the same amount treatment (1.8 ml / point) of the chlorpicrin agent was performed. After about one month, each ridge soil was collected in a unit of 5 cm × 5 cm, and a bacterial density test was performed using a selective medium. The results are shown in FIGS. 9a to 9c (in FIG. 9, one scale is 5 cm). The treatment section according to the conventional method is a treatment section according to the treatment method described with reference to FIG. 10, and is a case where the same amount of chlorpicrin agent is sprayed at a position near the surface of the cultivated soil cultivated by the rotary 3.

As can be seen by comparing FIGS. 9b and 9c, the treatment method according to the present invention also widely disinfects the hard soil layer above the injection point C (soil layer B), and has a more effective disinfection effect than the conventional method. It turned out to be high. The reason is that chlorpicrin, which is often used for soil disinfection in tobacco cultivation, easily gasifies in air, and its specific gravity is 5.7, which is higher than that of air. However, the soil layer below the cultivated soil was hardened so that crushing of the cultivated soil was required. There was no disinfecting effect to do. However, according to the method of the present invention, the drug is injected into the hard soil layer below the cultivated soil,
Then, the gasified chemical gradually diffuses in the hard soil layer, and penetrates into the ridges, which are the cultivated soil layer thereon, so that a broad soil disinfection effect as shown in FIG. 9c is obtained. It is thought that it was.

The example shown in FIG. 9 is data when one injection knife is installed for one ridge. However, it is conceivable that the diffusion state of the gasified drug differs depending on the type of soil. For example, it is widely known that the diffusion range of the gasified drug becomes narrow in a muddy soil. The reason for this is that the viscous soil is an aggregate of fine particles and has a characteristic of easily consolidating when containing moisture. This means that the gasified chemical cannot enter the gaps in the soil and is difficult to spread widely. In order to enhance the disinfecting effect on such soil, it is desired to disinfect the soil by attaching a large number of injection swords and adjusting the injection depth, the injection interval, and the injection amount per location.

For example, as shown in FIG. 2, two injection knives 80 are mounted, one pump is used for one injection knives, and a cam having a 90-degree phase difference is provided on the sensing wheel 60. Then, as shown in FIG. 7, the medicine is injected in a staggered manner to perform the disinfection operation. Thus, it is possible to effectively disinfect a wide range of soil layers using a small amount of a chemical. Further, as another embodiment, one pump may be provided with a large number of injection ports, and piping may be provided for each injection knife. In this case, the medicine discharged from the pump is discharged simultaneously from each injection knife.

[0037]

According to the present invention, in the area where the partial disinfection according to the present invention has been performed, the roots are not limited to the ridged soil such as tobacco, but extend to the lower part of the cultivated soil. Even when growing crops, it is possible to effectively prevent the invasion of the pathogenic bacteria into the crop through the roots, and it is possible to avoid the deterioration of the crop quality and the decrease in the yield due to the pathogenic bacteria.

Further, since the whole amount of the injected drug acts on soil disinfection, a large disinfection effect can be expected with a small amount of the drug, and environmental safety can be ensured. Further, the disinfecting effect range can be expanded with an amount equal to or less than the used amount per unit area by the conventional disinfecting machine.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which a drug injection and furrowing coating machine according to the present invention is mounted on a tractor.

FIG. 2 is a view showing a state in which the medicine injection and furrowing coating machine according to the present invention is viewed from the front side.

FIG. 3 is a diagram illustrating an injection knife.

FIG. 4 is a schematic side view illustrating a state in which soil disinfection is performed using the chemical injection and ridge covering machine according to the present invention.

FIG. 5 is a schematic cross-sectional view illustrating a state in which soil disinfection is performed using the chemical injection and ridge covering machine according to the present invention.

FIG. 6 is a diagram illustrating a sensing wheel.

FIG. 7 is a diagram illustrating a state in which a medicine is injected in a staggered manner.

FIG. 8 is a diagram illustrating a medicine tank.

9A and 9B are diagrams illustrating an example of soil disinfection in comparison with a conventional method, wherein FIG. 9A is a non-treated section, FIG. 9B is a section treated with a fungicide according to the conventional method, and FIG. The results of the bacterial density test are shown by using a selective medium in a treatment section subjected to a soil disinfection method using a coating machine.

FIG. 10 is a view for explaining a conventional example of a ridge simultaneous soil disinfection machine for tractors.

[Explanation of symbols]

100 ... Drug injection and furrow coating machine, 1 ... Tractor, 2 ...
Machine frame, 3 rotary, 4 ridge, 5 ridge setting device, 6 multi-film, 7 film coating device, 9 piping, 91
... Nozzle, 10 ... Drug tank, 11 ... Pump, 60 ... Sensing wheel rotating along the ridged ridge, 71 ... Control device for controlling injection timing of drug, 80 ... Injection knife, GL
... ground surface, A ... arable soil, B ... hard soil layer under arable soil, C ... injection point of chemicals, P ... chemicals

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A01N 33/18 A01N 33/18 A (72) Inventor Norio Mochizuki 1204 Kitamatsuno, Fujikawa-cho, Anbara-gun, Shizuoka Japan Stock Association Inside the Sano Attachment Research Laboratory (72) Inventor Makoto Hasegawa 1204 Kitamatsuno, Fujikawa-cho, Anbara-gun, Shizuoka Pref. Ingredients Division Kagoshima Leaf Tobacco Technology Center (72) Inventor Teruo Harazono 5648-2 Kamifukumoto-cho, Kagoshima City, Kagoshima Japan Tobacco Industry Co., Ltd. 5648-2 Fukumotocho Kagoshimabara, Japan Tobacco Inc. Headquarters Kagoshima Leaf Tobacco Technology Center in the F-term (reference) 2B024 AA01 CA02 CB03 DA06 2B032 AA07 CA03 CA04 CA06 CB28 DA01 DB10 GA02 GA06 2B121 AA20 CA02 CA13 CB15 CB20 CB33 CC03 EA25 FA15 4H011 AA01 BB04 DA13 DB06 DD04 DG05

Claims (6)

[Claims] 1. A chemical injecting and furrowing coater which is mounted on a mobile farming machine and pulled to lay the soil cultivated by an attached rotary while injecting the drug into the soil and coat the multi-film thereon. And the injection knife that injects the drug into the soil,
A chemical injection and ridge covering machine characterized in that its tip is attached to reach the soil layer deeper than the cultivated soil in the ridge. 2. The medicine injection and furrow coating machine according to claim 1, wherein the medicine to be injected is a chlorpicrin agent. 3. A control device for controlling a timing of injection of a medicine and a sensing wheel rotating along the ridges, wherein the control device issues a blowing signal in response to a signal from the sensing wheel. 2. The method according to claim 1, wherein
Or the drug injection and furrow coating machine according to 2. 4. An injection knife is provided two for the width of the ridge, and the control device is adapted to output an injection signal so that the two injection swords eject the medicine alternately. The drug injection and furrow coating machine according to claim 3. 5. A soil disinfection method for continuously disinfecting soil while mounting the chemical injection and ridge covering machine according to any one of claims 1 to 4 on a mobile agricultural machine and towing the mobile agricultural machine. A soil disinfection method characterized by injecting a chemical into a soil layer at a position deeper than a cultivated soil in a ridge which is cultivated by a rotary and ridged at a predetermined interval before cultivation. 6. The soil disinfection method according to claim 5, wherein the drug to be injected is a chlorpicrin agent.