JP2005087168A - Method for disinfecting soil by heating with hot water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for disinfecting soil by heating with hot water, capable of reducing the number of hoses for splashing hot water relative to the area of the soil so as to perform the installation work of the hoses for splashing hot water and removing work of them after completing the soil disinfection work quickly with less labor. <P>SOLUTION: This method for disinfecting the soil by heating with hot water is provided by extending the hoses for splashing hot water having many ejecting holes (11a) and loading the hoses on the surface (10a) of the soil (10), covering the soil surface (10a) including each of the hoses for splashing hot water (11) with a sheet (14), also elevating the inner peripheral part of the sheet (14) up to a position so that the most of hot water ejected from the hoses for splashing hot water does not make a contact with the sheet, in this state, ejecting hot water (18) from the hoses (11) for splashing hot water to penetrate the soil (10) with hot water (18), and elevating the temperature of the prescribed upper layer part of the soil (10) at higher than that of the extinction of crop pathogenic bacteria. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method for heating and disinfecting soil with hot water by heating the soil with hot water to kill pathogens of horticultural crops.

Conventional techniques include those shown in FIGS. 4 and 5. 4 and 5, reference numeral 1 denotes soil. The area of the soil 1 targeted for disinfection has a length L of about 50 m and a width W of about 6 m. Ten sprinkler hoses 2 are extended on the surface 1a of the soil 1 over the entire length in the longitudinal direction of the soil 1, and are placed in parallel at intervals P of 25 cm to 30 cm in the width direction. Each sprinkling hose 2 is formed with a large number of ejection holes 2a on the upper half side, and the right end in FIG. 4 is closed and the left end is connected in parallel to a branch header 3 extending in the lateral direction. This branch header 3 is connected to a boiler 5 via a supply hose 4.

Next, a sheet 6 made of polyethylene or vinyl is stretched along the surface 1 a of the soil 1 to cover the surface 1 a of the soil 1 including the above-mentioned watering hose 2 and the branch header 3. In this state, the boiler 5 is started, and hot water of about 80 ° C. to 90 ° C. is supplied from the boiler 5 to the watering hose 2 via the supply hose 4 and the branch header 3, Hot water is ejected from the holes 2a, and the hot water is sequentially permeated into the soil 1 from the soil surface. And the said boiler 5 is stopped when the soil temperature of the 20-30 cm depth position below the surface 1a of the soil 1 becomes 55 degreeC or more, and the ejection of the hot water by each hot water hose 2 is stopped.
Japanese Patent Publication No. 7-63280

In the above conventional one, since the sprinkling hose 2 is placed in parallel at a small interval in the sheet 6 stretched along the surface 1a of the soil 1, a large number of sprinkling hoses 2 are required. The installation work and the removal work after the soil disinfection have been required a lot of work. An object of the present invention is to obtain a novel soil hot water heating disinfection method that solves the above problems by reducing the number of sprinkling hoses to the soil area as much as possible.

In order to achieve the above object, the present invention is configured as follows. That is, the invention according to claim 1 extends a watering hose having a number of ejection holes and places it on the surface of the soil to be sterilized, covers the soil surface including each watering hose with a sheet, Raise the inner peripheral part of the sheet to a position where most of the hot water ejected from the hot water hose does not contact, in this state hot water is ejected from the hot water hose to penetrate the soil, The predetermined upper layer of the soil is configured to raise the temperature above the killing temperature of the crop pathogen.
In the invention according to claim 2, the watering hose having a number of ejection holes is extended and placed on the surface of the soil to be sterilized, and the soil surface including each watering hose is covered with a non-breathable sheet. The outer peripheral part of the sheet is brought into close contact with the surface of the soil by a weight, and then most of the hot water that is blown from the sprinkling hose through the inner peripheral part of the sheet by pumping air into the sheet by a blower does not contact Inflated up to a position, and in this state, hot water is ejected from the sprinkling hose to infiltrate the hot water into the soil, and the predetermined upper layer of the soil is raised above the killing temperature of the crop pathogen It is.
According to a third aspect of the present invention, the blower that pumps air into the non-breathable sheet is stopped at an initial time point when hot water is ejected from the hot water hose.

In the invention according to claim 1 of the present invention, the inner peripheral portion of the sheet covering the surface of the soil is raised to a position where most of the hot water ejected from the hot water hose does not contact, so The hot water that blows out becomes a parabolic shape and is sprayed almost uniformly on a wide range of soil surfaces. Thereby, the number of the hot water hose with respect to a soil area can be reduced.
Since the invention which concerns on Claim 2 pumped air in the sheet | seat with the air blower, it was made to inflate upward to the position where most of the hot water which spouts from the sprinkling hose does not contact the inner peripheral part of this sheet | seat The inner peripheral portion of the seat can be quickly raised without requiring labor.
In the invention according to claim 3, since the blower for pumping air into the seat is stopped at the initial time when hot water is ejected from the hot water hose, the seat is not cooled by the outside air, and the blower The power consumption will be reduced. In this case, the air in the sheet after the blower is stopped is heated and expanded by hot water, and the inner peripheral portion of the sheet is stably lifted by the internal pressure.

Hereinafter, the present invention will be described with reference to the drawings. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 is a diagram corresponding to FIG. 2 showing a second embodiment of the present invention. FIG.

1 and 2, reference numeral 10 denotes soil, and the area of the soil 10 targeted for disinfection has a length L of about 50 m and a width W of about 6 m as in the conventional case described above. Note that the area of the soil 10 targeted for disinfection is set as appropriate depending on the size of the greenhouse, the type of crop, and the like. In the center of the surface 10a of the soil 10, one hot water hose 11 is extended over the entire length of the soil 10 in the longitudinal direction, the right end in FIG. 1 is closed, and the left end is boiler through the supply hose 12. 13 is connected. The sprinkling hose 11 has a large number of ejection holes 11a formed radially at a predetermined pitch in the longitudinal direction on the upper half side thereof.

Covering the surface 10a of the soil 10 containing the sprinkling hose 11 with a non-breathable sheet 14 made of a polyethylene sheet or a vinyl sheet, and placing a water pillow duct 15 (weight) on the periphery of the sheet 14 as an extension, The duct 15 is filled with water for weight. Further, the entire upper surface of the sheet 14 is covered with a lightweight heat insulating sheet 16. Next, the blower 17 is disposed at one end of the sheet 14, in this example, the left end, and the blower duct 17 a connected to the discharge side of the blower 17 is inserted into the left end of the sheet 14.

Next, the blower 17 is activated, and air (outside air) is pumped into the seat 14 through the blower duct 17a, so that the inner peripheral portion of the seat 14 is expanded in an arc shape. As shown in FIG. 2, the bulge amount of the inner peripheral portion is a bulge amount that does not contact the hot water 18 ejected from the hot water hose 11. In this case, as shown in FIG. 2, the position and diameter of each of the spout holes 11 a formed in the sprinkling hose 11 are such that the hot water 18 has an arc shape within a range of about 3 m on the left and right sides of the sprinkling hose 11. It is set to spout.

In this state, the boiler 13 is started, hot water 18 having a temperature of about 80 ° C. to 90 ° C. is supplied from the boiler 13 to the hot water hose 11 through the supply hose 12, and the hot water 18 is heated from the ejection hole 11 a of the hot water hose 11. Water 18 is ejected. In addition, the blower 17 is stopped at an initial time when the hot water 18 is ejected. The time for which the hot water 18 is ejected from the spout 11a of the sprinkler hose 11 is such that the temperature of the soil upper layer at a depth of 20 to 30 cm below the surface 10a of the soil 10 is the killing temperature of the crop pathogen, in this example 55 ° C. Until it is over. The inner peripheral portion of the sheet 14 may be formed by bending a crosspiece member into the soil 10 in an arcuate shape and planting it at a predetermined pitch in the longitudinal direction and lifting it upward by this crosspiece member.

FIG. 3 shows a second embodiment of the present invention. In FIG. 3, reference numeral 10 denotes soil for disinfection, and the area is the same as described above. At the center of the surface 10a of the soil 10, the two sprinkling hoses 11, 11 are arranged so as to extend over the entire length in the longitudinal direction of the soil 10, with the interval P1 in the width direction being about 3 m. One end is closed and the other end is connected to the boiler 13 described above. As shown in FIG. 3, the position and diameter of each ejection hole 11 a formed on the upper half part side of each of the sprinkling hoses 11 is about 1.5 m from the hot water 18 to the left and right around each sprinkling hose 11. It is set to be ejected in an arc shape in the range of. The rest of the configuration is substantially the same as that of the first embodiment described above.

According to the above embodiment, the inner peripheral portion of the sheet 14 covering the surface 10a of the soil 10 is raised to a position where most of the hot water 18 ejected from the hot water hose 11 does not come into contact. The hot water 18 ejected from the ejection holes 11a is ejected in a parabolic shape without colliding with an obstacle, and is distributed substantially uniformly over a wide range of soil surface 10a. Thereby, the number of the hot water hose 11 with respect to a soil area reduces, The installation operation | work of this and the removal operation | work after completion | finish of soil disinfection can be performed rapidly and with little effort.

Further, since the inner peripheral portion of the seat 14 is inflated upward by the air pressure from the blower 17, the inner peripheral portion of the seat 14 can be quickly raised to a predetermined position without requiring labor. Furthermore, since the blower 17 that pumps air into the seat 14 is stopped at the initial time when the hot water 18 is ejected from the sprinkling hose 11, the inside of the seat 14 is not cooled by the outside air, and the blower 17 Power consumption will be reduced.

It is a top view which shows 1st Example of this invention. It is an expanded sectional view by the II-II line of FIG. It is an expanded sectional view equivalent to FIG. 2 which shows 2nd Example of this invention. It is a top view which shows a prior art example. FIG. 5 is an enlarged cross-sectional view of a main part taken along line V-V in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soil 10a Surface 11 Sprinkling hose 11a Spout hole 12 Supply hose 13 Boiler 14 Sheet 15 Water pillow duct (weight)
16 Thermal insulation sheet 17 Blower 17a Blower duct 18 Hot water

Claims (3)

Soil surface (10a) including each sprinkling hose (11) placed on the surface (10a) of the soil (10) to be sterilized by extending the sprinkling hose (11) having a number of ejection holes (11a) Is covered with the sheet (14), and the inner periphery of the sheet (14) is raised to a position where most of the hot water (18) ejected from the sprinkling hose (11) is not in contact, Hot water (18) is ejected from the water sprinkling hose (11) and the hot water (18) is infiltrated into the soil (10), and a predetermined upper layer of the soil (10) is raised above the killing temperature of the crop pathogen. A method for disinfecting soil with hot water by heating. Soil surface (10a) including each sprinkling hose (11) placed on the surface (10a) of the soil (10) to be sterilized by extending the sprinkling hose (11) having a number of ejection holes (11a) Is covered with a non-breathable sheet (14), the outer periphery of the sheet (14) is brought into close contact with the surface (10a) of the soil (10) by a weight (15), and then the sheet (14) is blown by a blower (17). 14) Air is pumped into the sheet and the inner periphery of the sheet (14) is inflated upward to a position where most of the hot water (18) ejected from the hot water hose (11) is not in contact, Hot water (18) is ejected from the water sprinkling hose (11) and the hot water (18) is infiltrated into the soil (10), and a predetermined upper layer of the soil (10) is raised above the killing temperature of the crop pathogen. Hydrothermal heating disinfection method of soil characterized by letting . The blower (17) for pumping air into the non-breathable sheet (14) is stopped at an initial time point when hot water (18) is ejected from the hot water hose (11). Hot water heat disinfection method of soil.

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