JP2006304638A - Apparatus for sterilizing soil and method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for sterilizing soil, capable of effectively conducting sterilization treatment of the soil, by stirring the treated soil in an ozone gas atmosphere so as to make the soil efficiently absorb ozone gas and, simultaneously, shielding the ozone gas from the open air so as to prevent the gas from diffusing into the open air, and capable of preserving an practical effect of sterilization action of the ozone gas, by covering the ground after the sterilization with a cover sheet. <P>SOLUTION: This apparatus for sterilizing the soil has a case body 12 and a cultivating device 14, wherein the case body 12 is arranged so as to cover a predetermined region of the ground from the upper surface thereof, the lower surface of the case body is opened, a hollow inner part N of the case body is directly brought into contact with the ground, and the cultivating device 14 for cultivating a part of the ground is arranged in the case body. Further, the case body is traveled, while the inside of the case body is supplied with the ozone gas and the ozone gas is injected into the cultivated soil, in such a state that the hollow inner part of the case body is shielded from the open air. Furthermore, a cover sheet-extending device 60 is positioned at the rear of the case body, so that the sterilization treatment is conducted by moving the case body, while the soil immediately after the injection of the ozone gas is covered with an agricultural cover sheet S. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an agricultural soil sterilization apparatus and method.

In recent years, reproduction of malignant soil fungi and agricultural chemical contamination due to repeated rotation of agricultural land has been greatly improved. Agricultural land cropping failures are (1) soil nutrient depletion, (2) abnormal soil pH, (3) deterioration of soil physical properties, (4) accumulation of harmful substances from cultivation, (5) harmful soil organisms It is caused by accumulation. Above all, it is said that the problems of (3), (4) and (5) are linked to each other to form the cause of the disorder, but the biggest cause of continuous crops such as vegetables is soil-borne diseases. There are many fungi that cause this, such as fungi including mold, some bacteria, or soil organisms. That is, by continuous cropping of the same type of crop, pathogenic bacteria accumulate by repeating a cycle in which fungi that invade the roots grow on the roots, survive on the remaining roots, and then infect new roots and grow. The shorter the period from harvesting to the next planting, the less the pathogen kills on the remaining roots, thereby accelerating the accumulation of pathogens associated with continuous cropping. In addition, most of the agricultural chemicals for controlling animals, insects, pathogens and weeds harmful to crops have residual toxicity for their intended use, and their use is under strict regulations. Conventionally, methyl bromide (CH ₃ Br) has been frequently used for soil disinfection, but this method is expensive and there is a risk of secondary contamination by methyl bromide itself. On the other hand, ozone sterilization has recently been used in many fields as an environmentally friendly sterilization method, and a plant cultivation method and apparatus in which this is applied to the agricultural field has been proposed in, for example, Japanese Patent Laid-Open No. 10-229752. .
JP-A-10-229752

  The apparatus of the above-mentioned Patent Document 1 diffuses ozone in pressurized water into the soil by, for example, pumping pressurized water in which ozone gas is dissolved into the soil where the plant is cultivated and opening it to the atmosphere. A sufficient amount of gas is supplied to the root of the plant, and plant pests and pathogens are sterilized with ozone water. In this device, ozone gas dissolves in water and is diluted, so the concentration is high. As a result, the pressurized water supply time is long, and a large amount of supply is required, resulting in high work efficiency and high processing costs. In addition, this device requires a pump, a compressor, a chemical solution tank, a gas dissolving device, a pressurized tank, etc. for liquid pumping, and the compressor and the pressurized tank are enlarged. Since it is necessary to embed and arrange a large number of sprinkling pipes, there is a problem that the construction work becomes large and the material and work cost are high. Further, the maintenance is not easy and there is a problem that it is not practical. In addition, it is possible to spray ozone water from the ground, but after all, high-concentration sterilization is not performed, and a large amount of liquid supply and supply time are required. It was also necessary to consider the impact.

The present invention has been made in view of the above-described conventional problems, and one object thereof is to stir the treated soil in an ozone gas atmosphere to efficiently absorb ozone gas, and at the same time, seal it from the atmosphere to suppress atmospheric diffusion of ozone, An object of the present invention is to provide a soil sterilizing apparatus and method capable of efficiently sterilizing soil. Another object of the present invention is to sterilize the soil and simultaneously cover the surface of the treated soil with a multi-sheet for agriculture, to suppress the rise in surface temperature, to control weeds, to prevent the outflow of underground nutrients, etc. An object of the present invention is to provide a soil sterilizer capable of retaining soil quality. Furthermore, another object of the present invention is to disinfect the soil by coating the surface of the treated soil as a multi-sheet for agriculture with a flexible plank sheet formed by processing organic fine pieces simultaneously with soil sterilization. At the same time, an object of the present invention is to provide a soil sterilization apparatus capable of retaining soil quality.

In order to achieve the above-described object, the present invention moves the upper surface of the soil E to be treated in a sliding manner, and opens the lower surface that keeps the hollow portion N and the outside air U in an isolated state during the movement. A hollow closed case body 12, a tillage device 14 that is disposed in the case body and cultivates soil inside the case body, and an ozone gas generation device 16 that generates ozone gas to be supplied into the case body, are cultivated in the case body. The soil is sterilized by moving the case body 12 while injecting ozone gas into the soil. The shape of the hollow case body 12 having the lower surface opened may be arbitrary. Strictly speaking, the tilling device 14 includes, for example, soil agitation at the same time as the case body travels without performing the tilling action. The movement of the case body may be connected to the rear of a tractor, a truck or the like as in the embodiment, or a rolling mechanism such as a wheel may be incorporated into the case body itself and integrated to be self-propelled.

  At that time, the ozone gas from the ozone gas generator 16 may be supplied so as to be ejected toward the closed hollow N of the case body 12.

  Moreover, the case body 12 includes both side walls 18 and 18 with respect to the moving direction and is composed of an inverted container body having an open bottom surface. The case body 12 is in a state where all or a part of both side walls are inserted into the soil during movement. It is good to move. Even in a mode in which the insertion part into the soil is not formed, any configuration that can ensure a shield from the outside air may be used.

  Further, the side walls 18 and 18 are preferably formed in an inclined shape with the lower end lowered from the moving front end side to the rear end side, and the case body can be configured to have an airtight holding inside and outside the case body while simply forming the shape of the side wall of the case body. Can be done on the side. The side wall may be formed by simply extending a rectangular portion in a straight shape, or may have another arbitrary shape.

  The case body 12 may be connected to the traction drive device 34 in a state where the front portion in the movement direction is supported, and the case body 12 may move so as to ground the front end grounding portion 24 of the case body.

  Moreover, it is good to attach the coating sheet | seat installation apparatus 60 which coat | covers the soil upper surface immediately after inject | pouring ozone gas in the movement direction rear end side of the case body 21. FIG. The covering sheet is excellent in that continuous laying can be realized when the sheet is rolled out.

  Further, the covering sheet spreading device 60 may include a presser arm mechanism 66 that presses the inner side of the sheet S fed from the sheet roll 62 near both ends in the moving direction from above.

  The covering sheet S is more preferably a flexible thick plate sheet 621 formed by laminating organic fine pieces.

  Further, it is preferable to provide a watering device 76 for sprinkling water on the upper surface of the covering sheet S at the same time as laying the coating sheet S. The liquid film is stretched on a flexible thick plate sheet on which organic fine pieces are laminated to dissipate ozone gas. To prevent.

In addition, the present invention is a case body 12 in which a tiller is disposed so as to cover the ground in a predetermined region from the upper surface, the lower surface is opened, the hollow interior is in direct contact with the ground, and the ground portion is cultivated inside. Have
It comprises a soil sterilization method of running the case body while injecting ozone gas into the soil to be cultivated by supplying ozone gas into the case body in a state where the hollow interior N and the outside air U are shut off.

In that case, it is good to attach a covering sheet installation apparatus to the rear part of a case body, and to disinfect by moving a case body, covering the soil immediately after inject | pouring ozone gas with the agricultural covering sheet.

The soil sterilization apparatus of the present invention is a hollow closed case body having an open lower surface that moves the upper surface of the soil to be treated in a sliding manner and keeps the hollow portion inside and the outside air in a blocked state during the movement, and the case A case body including a tilling device that is disposed in the body and cultivates the soil inside the case body, and an ozone gas generation device that generates ozone gas to be supplied into the case body, while injecting ozone gas into the cultivated soil in the case body As a result of injecting high-concentration ozone gas directly into the soil that is continuously cultivated in the moving case under the air shield, the sterilization of the treated soil is ensured in a short time. It can be performed with high efficiency. Furthermore, by simultaneously spreading the soil component adjustment solution into the case body, the soil can be modified at the same time.

  Further, the ozone gas from the ozone gas generator is supplied so as to be ejected toward the closed hollow of the case body, whereby the discharge nozzle for ozone gas supplied from the ozone gas generator is connected to the outer wall of the case body. It is only necessary to attach to the hollow interior in a continuous manner, and the soil injection of high-concentration ozone gas can be reliably performed with a simple configuration.

  Since the case body includes both side walls with respect to the moving direction, and is composed of an inverted container body having an open bottom surface, the case body moves in a state where all or a part of both side walls are inserted into the soil during movement. The case body can be traveled in a state where at least both sides in the traveling direction are shielded from the atmosphere, and the general airtight maintenance of the hollow interior can be realized with a simple configuration only by setting the shape of the case body.

  In addition, the both side walls have a lower end that is inclined from the front end side to the rear end side so as to be inclined so that at least both sides in the traveling direction of the case body are shielded from the atmosphere. It is possible to keep the effectiveness of the shielding effect inside the hollow during traveling by reducing the resistance and reducing the vertical movement of the case body as much as possible by proceeding to open the roots, stumps and other obstacles.

  The case body is connected to the traction drive device with the front portion in the moving direction supported, and the case body moves by grounding the front end grounding portion of the case body. As a result of moving while supporting the front part of the direction at all times with a supporting force that applies a load to the ground to some extent, the case body may be damaged or destroyed due to the front end side of the case body piercing into the soil when moving the case body The case body can be moved and moved stably.

  In addition, the soil immediately after injecting the ozone gas is provided on the rear end side in the moving direction of the case body by providing a covering sheet spreading device that covers the upper surface of the soil immediately after the ozone gas is injected. Since the case body is moved and sterilized by covering the sheet and confining the gas, ozone gas is reliably left in the soil even during the lifetime of several minutes after the ozone gas is injected, and the soil is sterilized. It is possible to reliably perform the action.

  In addition, the covering sheet spreading device has a presser arm mechanism that presses the inner side near both ends in the moving direction of the sheet fed from the sheet roll from above, so that the pressing state is maintained when the case body is moved to the ground. The sheet can be securely attached and held.

  Moreover, the following effect can be acquired simultaneously with soil sterilization by setting it as the structure which is a flexible thick plate sheet | seat which the covering sheet formed by laminating | stacking an organic fine piece. In other words, it can maintain the functions of agricultural multi-sheets such as suppression of ground surface temperature rise of plant-grown soil, weed control, and prevention of runoff due to rain in the ground, and the used sheet can be spread directly in the soil. In addition, the sheet stripping operation, the sorting operation from the soil, and the like are unnecessary, and in addition, a sufficient amount of minerals derived from natural plants can be supplied to the soil to maintain the soil suitable for crop cultivation. Moreover, since sufficient air can be hold | maintained in soil by this, the soil quality improvement through a microbial action can also be performed. Furthermore, effective utilization of resources can be realized by using plant waste materials, and production at low cost is also possible.

  In addition, by installing a watering device that forms a liquid film by sprinkling water on the top surface of the covering sheet at the same time, a liquid film is stretched on a flexible thick sheet with organic fine pieces laminated to prevent the emission of ozone gas. In addition, the effectiveness of ozone gas injection can be ensured.

Further, the soil sterilization method of the present invention is arranged such that a tilling device is disposed so as to cover the ground in a predetermined region from the upper surface, the lower surface is opened, the hollow interior is in direct contact with the ground, and the ground portion is cultivated inside. Since the case body is run while injecting ozone gas into the soil to be cultivated by supplying ozone gas into the soot body in a state where the hollow inside of the case body and the outside air are shut off, the case body travels under the air shield. As a result of directly injecting high-concentration ozone gas gas into the soil to be cultivated in the case body, the treated soil can be sterilized reliably and in a short time with high efficiency. Furthermore, by simultaneously spreading the soil component adjustment solution into the case body, the soil can be modified at the same time.

In addition, a cover sheet spreading device is attached to the rear part of the case body, and the ozone gas is injected by adopting a structure in which the case body is moved and sterilized while covering the agricultural cover sheet immediately after the ozone gas is injected. Since the case body is moved and sterilized by covering the soil with the agricultural covering sheet on the soil immediately after the gas is trapped, the soil is surely put into the soil even during the lifetime of several minutes after the ozone gas is injected. It is possible to leave the ozone gas and reliably sterilize the soil.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 to FIG. 5 are views showing an embodiment of the soil sterilizing apparatus of the present invention, and FIG. 1 is a partially cutaway side view for explaining the entire configuration. In the figure, the soil sterilization apparatus 10 includes a case body 12, a tilling apparatus 14, and an ozone gas generation apparatus 16.

The case body 12 is a case means for soil doping of ozone gas that directly injects ozone gas into the soil cultivated inside the case while sealing from the atmosphere and suppressing the atmospheric diffusion of ozone. In this embodiment, the case body 12 is treated. It is configured as continuous ozone gas injection case means that moves the upper surface of the soil E to slide and keeps the hollow portion N and the outside air U in an isolated state during the movement and continuously injects ozone gas into the ground surface. ing. That is, the case body 12 is composed of a hollow closed case body having an open lower surface that keeps the internal hollow portion N and the outside air U in a blocked state even when the upper surface of the soil to be treated moves. Specifically, the case body 12 includes a reversing container body including both side walls 18 with respect to the moving direction and having an open bottom surface. In the embodiment, the case body 12 is formed, for example, by forming a thin metal plate into a short bowl shape and integrally covering the front and rear parts of the movement and the top surface part, and the arcuate wall 20 is hermetically joined to the movement direction. On the other hand, it is formed by semicircular side walls 18 provided on both sides, the bottom surface is opened, and the space of the hollow portion N is formed directly facing the soil ground to be treated. The case body 12 moves in a state where all or a part of both side walls thereof are inserted into the soil during movement. That is, in the drawing, the lower end side of both side walls 18 has a horizontally elongated substantially right-angled triangular portion formed in an inclined shape from the moving front end side to the rear end side, and this triangular portion is an insertion portion in the soil. 22 is formed so that the case body moves in a state where at least the lower ends of both side walls are inserted into the soil during the movement, thereby sealing the hollow interior on the side of the case body and the atmosphere. ing. Further, the front end side of the case body 12 forms a front end grounding portion 24 that contacts the ground, and the rear end side similarly forms a rear end grounding portion 26 that contacts the ground. In the embodiment, the front end grounding portion 24 has an inner bent portion that is bent so as to form a curved surface toward the inside of the case, thereby increasing resistance with the ground when the case body moves forward. The airtightness can be maintained while avoiding this. Also, the rear end grounding portion 26 always lands on the ground and seals the rear wall side. Similarly, it is preferable that the resistance at the time of movement is reduced as much as possible with the rear end side bent inward or outward.

1 and 2, a tilling device 14 is disposed in the case body 12. The cultivator 14 is a cultivating means for cultivating or stirring the ground portion where the case body is located and covered with the case body, and the case body cultivates the ground while moving on the ground. Specifically, the tilling device 14 is fixed to a plurality of rotating rods 28 that are rotatably supported on both side walls 18 of the case body 12 and the rotating rods 28 at a predetermined separation interval in the longitudinal direction of the rotating rods 28. , And an arrow wheel-shaped blade body 30 projecting from the rotating rod in the radial direction. One end side of the rotating rod 28 is rotationally driven via a power transmission mechanism 32 described later. As shown in the drawing, each of the arrow wheel-shaped blade bodies 30 is formed of an arrow wheel-shaped incisor, and is arranged such that a considerable portion is in a puncture state in the ground when the case body is stationary due to the weight of the case body. And the soil to a depth of several tens of centimeters, for example, is dug up by the arrow wheel blades of the tilling device 14, that is, the arrow wheel incisors, and uniformly contacted with ozone and absorbed. For example, if the depth is plowed on an extended line of normal farm work, the soil of these portions is uniformly treated with ozone.

In this embodiment, the case body 12 is connected to the traction drive device 34 and moves while being pulled by the device 34. Note that the case body 12 may be self-propelled by mounting a driving mechanism including a driving wheel, a crawler, and other conveying bodies on the case body 12 itself. Further, at that time, the operator may drive and drive by driving, or may perform a self-running operation by a wired or wireless control instruction. Further, the traction device may be run while being controlled by wire or wireless. The traction drive device 34 of the present embodiment is traction drive means that is separate from the case body 12 and is disposed at a position immediately before the case body 12. For example, a power vehicle such as a tractor, a truck, or a loader is used. The traction drive device 34 of the embodiment uses, for example, a crawler tractor, and includes a crawler 36 that travels on the ground, a body 38, and a travel drive device (not shown). The crawler is driven to travel through the travel drive device. A support arm 40 protrudes rearward from the rear end side of the machine body 38, the other end side of the support arm 40 is connected and joined to the front end side of the case body 12, and the front part in the movement direction of the case body 12 is pulled. Supported by device 34. That is, the case body 12 is connected to the traction drive device 34 in a state where the front portion in the movement direction is supported, and the case body 12 is configured to move so that the front end grounding portion 24 of the case body is grounded. As a result, the front part in the moving direction of the case body 12 is always grounded and moves while being supported by a supporting force to which a load is applied to the ground to some extent. The tilling device 14 in the case body 12 is driven by receiving the rotational power from the traction drive device 34. In this embodiment, the tiller device 14 is driven by the rotatory power transmission mechanism 32 from the traction drive device 34. The body 30 is driven to rotate. Specifically, the rotational power transmission mechanism 32 is connected to connect the traction drive device 34 and the case body 12, and is connected to the transmission shaft 42 for transmitting the rotation output of the tractor body, and the transmission shaft 42 is attached to the case body 12. Including a conversion mechanism 44 that converts the rotational power of the shaft into rotation of an axis orthogonal to the traveling direction of the case, an orthogonal shaft 46, and an interlocking mechanism 48. The interlocking mechanism 48 includes an interlocking chain 52 accommodated in the chain case 50 and tuned to the end of the orthogonal shaft 46 and one end of the rotating rod 28, and is thereby attached to the rotating rod 28 by the rotational output of the tractor. Each incisor is driven to rotate. A generator 54, a compressor 56, and a cooling water supply pump 58 connected to the ozone gas generator 16 are mounted in the body 38 of the traction drive device 34. Supply cooling water.

On the other hand, the ozone gas generator 16 is ozone generating means for generating ozone in a gas state to be supplied into the case body 12, and in the embodiment, the ozone gas generator 16 is disposed with the ozone outlet 161 facing the hollow portion N of the case body 12. In addition, an ozonizer apparatus using a dielectric barrier discharge method is applied. In this dielectric barrier discharge method, plasma under a certain condition can be generated even under atmospheric pressure, the device configuration can be simplified, and the size can be reduced. In this generator, for example, by interposing a dielectric (glass, etc.) in the discharge path, it is possible to avoid the transition to arc discharge (spark discharge), and to generate streamer type micro discharge that repeats generation and extinction in a short time. Thus, plasma generation under atmospheric pressure is realized by generating randomly. For example, it has been demonstrated that the ozone generation apparatus using the dielectric barrier discharge method can realize high-concentration ozone generation of 2% (40 g / m 3). For example, a case body for processing a ground portion having an area of about 2 square meters. Even if it is large in size, it is possible to realize injection of ozone gas in a sufficient amount to instantly kill harmful bacteria. As is well known, ozone gas has a sterilization effect 7 times that of chlorine due to its strong oxidizing power. The raw materials are only oxygen and water in the air, the running cost is low, there is no residual toxicity, and there is no risk of secondary pollution in terms of environment. Therefore, the soil portion effective for plant cultivation can be sterilized with high efficiency by effectively injecting ozone gas into the soil to be cultivated in a moving space shielded from the atmosphere.

In the present embodiment, a covering sheet extending device 60 that covers the upper surface of the soil immediately after the ozone gas is injected is additionally provided on the rear end side in the moving direction of the case body 12. The covering sheet spreading device 60 is a soil ground covering means for continuously covering the soil immediately after injecting ozone gas in the case body 12 shielded from the atmosphere with the agricultural covering sheet S, and after releasing ozone. The surface of the soil is covered with a coating sheet for the remaining time of several minutes of the lifetime of ozone gas to maintain the sterilization effect and realize an effective sterilization treatment. In the embodiment, the covering sheet spreading device 60 includes a sheet roll 62 around which a covering sheet is wound, a sheet presser 64, and a presser arm mechanism 66. The agricultural covering sheet is a so-called agricultural multi-sheet, and is a ground surface covering sheet that suppresses the rise in the ground surface temperature of plant-cultivated soil, controls weeds, prevents runoff due to rain in the ground, and the like. The sheet material of the sheet roll 62 may be a plastic vinyl film or other synthetic resin material, paper or the like, but in the present embodiment, it is composed of a flexible thick plate sheet 621 formed by laminating organic fine pieces. The flexible plank sheet 621 includes, for example, a chip forming step (S1) for fragmenting plant natural material waste such as architectural wood waste, sawmill waste, thinned wood, and other wood waste, and chipped plants. High-pressure heating process (S2) for heating the natural natural material waste under high pressure, the fibrous fragmentation process (S3) of the vegetable natural material waste by releasing the pressure after high-pressure heating, and the plant-derived natural natural material It is a coated sheet of natural plant material produced by a processing step including a step (S4) for further finely pulverizing the waste material and a step (S5) for forming a bulk sheet using the biodegradable adhesive material. In addition to the agricultural multi-sheet function described above, in addition, the used sheet is sown into the soil as it is to remove the sheet, sorting from the soil, etc. The amount of minerals in the soil Supply to be able to hold the soil suitable for crop cultivation in. Moreover, since sufficient air can be hold | maintained in soil by this, the soil quality improvement through a microbial action can also be performed. Furthermore, effective utilization of resources can be realized by using plant waste materials, and low-cost production is sufficiently possible. The sheet roll 62 is horizontally long so as to be substantially orthogonal to the traveling direction of the case body. The sheet roll 62 has a shaft rod 68 inserted into the center of the roll, and is rotatably supported by a bearing member (not shown) supported by the case body 12.

The sheet presser 64 is a presser unit that presses the cover sheet fed from the sheet roll 62 from above and contacts the sheet with the ground. In particular, the sheet presser 64 holds the pressed state when the case body 12 is moved, and reliably holds the sheet on the ground. Try to attach. The sheet presser includes a presser roll disposed in a crossing direction in the traveling direction of the case body at a low position near the ground, and is supported freely. The sheet is pulled out by engaging with the lower surface of the presser roll when being fed.

The presser arm mechanism 66 is a covering holding means that presses the inner side of both ends of the sheet fed from the sheet roll 62 from the upper side to ensure the covering to the ground. In the present embodiment, the presser arm mechanism 66 is inverted U-shaped from the case body 12. The presser arm 70 extends in a shape and has a lower end slightly below the ground, and a part of the presser arm 70 that is partly submerged in the ground. A roller 72 is supported on the presser end side of the presser arm 70 so as to be able to roll, and presses the sheet so as not to tear the sheet and secures smooth movement on the sheet.

In addition, it is better to attach a spraying device (not shown) for spraying water and / or nitrogen-containing liquid from the spread covering sheet, water at the same time as laying of the sheet body formed of organic fine piece material, The multi-sheet function can be reinforced by replenishing nitrogen-based components lost by sterilization.

Further, an ozone gas sensor 74 is installed in the case body, detects the ozone gas concentration, and adjusts the ozone gas concentration and amount in the hollow portion N appropriately through the control device mounted on the ozone gas generator 16. .

  In addition, a watering device 76 for forming a liquid film by watering the upper surface of the covering sheet at the same time as the covering sheet is laid is provided. The watering device 76 includes a liquid tank 78, a supply pipe 80, and a watering nozzle 82, and sprinkles water from the top surface of a flexible thick plate sheet on which organic fine pieces covering the soil into which ozone gas has been injected are laminated to form a liquid film. This will prevent the ozone gas from diffusing and ensure the effectiveness of ozone gas injection. In the case where the flexible thick plate sheet 621 is not formed by pressure bonding and is configured as a sheet having a mesh-like porous void, this liquid film formation is effective and effective. Although not shown, a liquid tank containing nitrogen and other plant essential components may be separately mounted on a traction drive device or the like, and sprayed simultaneously from the top of the covering sheet.

Next, the operation of the soil sterilization apparatus according to this embodiment will be described together with the sterilization method. While the traction drive device 34 is traveling, the rotational force obtained from the output shaft is transmitted via the power transmission mechanism 32 to the tillage device 14. And the arrow wheel-shaped blade body 30 is rotationally driven. Thereby, soil is dug up in the closed space in the case body 12 sealed from the atmosphere. When the soil is cultivated by the arrow wheel incisors, the soil is dug up to the depth reached by the arrow wheel incisors and stirred. At this time, the entire ground portion of the arrow-shaped incisor is covered with a box-shaped container, that is, a case body, whose opening surface sinks from the soil surface. In this state, the operation of the traction drive device 34 from the driver's seat side turns on the generation and discharge switch of the ozone gas generation device 16 so that high-concentration ozone gas is ejected from the ozone ejection port 161 and continuously dug up. Injected directly against the soil. At this time, when ozone gas is introduced into the space closed by the case body and the ground, the gas is absorbed into the soil by being stirred while the soil and the gas are in uniform contact. At this time, such a method in which the concentration value is detected via the sensor 74 so as to maintain the ozone gas concentration within an appropriate range, ozone gas having a concentration within the set range is supplied, and the amount of gas absorbed into the soil is controlled. The soil is uniformly treated with ozone by absorbing ozone gas in the soil. When this case body and the arrow wheel-shaped incisors are integrated and moved at a constant speed, soil that has been uniformly ozone treated after moving is left. In these soils, ozone remains for a few minutes, which is the lifetime, or diverges into the atmosphere. Therefore, if the surface is covered with a soft plastic sheet, not only the bactericidal effect is maintained but also a function of safety measures by atmospheric diffusion is provided at the same time. Therefore, the covering sheet is covered from the upper surface of the soil into which ozone gas has been injected by the covering sheet spreading device 60 disposed immediately after the case body 12 simultaneously with the travel of the traction drive device 34, and the width direction in the traveling direction thereof Since both ends are pressed by the sheet presser 64, the injected ozone gas is covered and confined without being diffused to the atmosphere, so that it remains reliably in the soil during the lifetime of several minutes after the ozone gas is injected. The bactericidal action against is surely performed. Also, after covering the surface with a soft plastic sheet or covering a flexible thick plate sheet of organic fine pieces, etc., the liquid film is stretched to block the ventilation between the soil and the atmosphere, so that the sterilization effect can only be sustained. In addition, the function of safety measures by atmospheric diffusion can be performed at the same time.

  As the soil sterilization method of the present invention, a tilling device is disposed so as to cover the ground in a predetermined region from the upper surface, the lower surface is opened, the hollow interior is in direct contact with the ground, and the ground portion is cultivated inside. The case body is made to run while injecting ozone gas into the soil to be cultivated by supplying ozone gas into the case body in a state where the hollow inside of the case body and the outside air are shut off. Further, a covering sheet spreading device is attached to the rear part of the case body, and the case body is moved and sterilized while the agricultural covering sheet is covered on the soil immediately after the ozone gas is injected.

  The soil sterilization apparatus and method according to the present invention can efficiently sterilize infectious disease germs that occur at the time of rotation or continuous cropping several times a year, which accelerates the cultivation cycle of recent crops. It can be effectively applied in ground sterilization and its modification treatment.

It is a partial notch schematic structure side explanatory view of the soil sterilizer concerning the embodiment of the present invention. It is an AA line arrow directional view of FIG. It is a partially cutaway perspective view of a case body main body. It is a whole perspective explanatory drawing of the soil sterilizer of FIG. It is a BB line arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soil sterilizer 12 Case body 14 Tillage device 16 Ozone gas generator 18 Side wall 60 Cover sheet spreading device 64 Sheet presser 66 Presser arm mechanism E Soil N Hollow part U Outside air

Claims (11)

A hollow closed case body that moves the upper surface of the soil to be treated in a sliding manner, and that opens the lower surface that keeps the internal hollow portion and the outside air in a blocked state during the movement,
A tilling device arranged in the case body and cultivating the soil inside the case body;
An ozone gas generator for generating ozone gas to be supplied into the case body,
A soil sterilization apparatus for moving a case body while injecting ozone gas into cultivated soil in the case body.   2. The soil sterilizer according to claim 1, wherein ozone gas from the ozone gas generator is supplied so as to be ejected toward the closed hollow of the case body. The case body is composed of an inverted container body including both side walls with respect to the moving direction and having an open bottom surface.
The soil sterilizing apparatus according to claim 1 or 2, wherein the case body moves in a state where all or part of both side walls are inserted into the soil during movement.   4. The soil sterilizing apparatus according to claim 3, wherein the both side walls are formed in an inclined shape with the lower end lowered from the front end side to the rear end side. The case is connected to the traction drive device with the front part in the moving direction supported.
The soil sterilizer according to claim 3 or 4, wherein the case body moves so as to ground the front end grounding portion of the case body.   The covering sheet spreading device for covering the upper surface of the soil immediately after the ozone gas is injected is attached to the rear end side in the moving direction of the case body. Sterilizer.   7. The soil sterilizing apparatus according to claim 6, wherein the covering sheet spreading apparatus has a presser arm mechanism that presses the inner side near both ends in the moving direction of the sheet fed from the sheet roll from above.   The soil sterilizer according to claim 6 or 7, wherein the covering sheet is a flexible thick plate sheet formed by laminating organic fine pieces.   9. The soil sterilizing apparatus according to claim 8, further comprising a watering device for forming a liquid film by sprinkling water on the upper surface of the covering sheet simultaneously with the laying of the covering sheet. The case body is disposed so as to cover the ground in a predetermined area from the upper surface, the lower surface is opened, the hollow interior is in direct contact with the ground, and the tilling device for cultivating the ground portion is disposed therein,
A soil sterilization method comprising running a case body while injecting ozone gas into soil to be cultivated by supplying ozone gas into the case body in a state where the hollow interior of the case body and outside air are blocked. The soil according to claim 10, wherein a covering sheet spreading device is attached to the rear part of the case body, and the case body is moved and sterilized while the agricultural covering sheet is covered on the soil immediately after the ozone gas is injected. Sterilization method.

Images