JPH11293249A - Improvement of soil, soil for cultivating crop cultivation of crop with the same soil, and crop produced by the cultivation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an improved fertile soil free from contamination with agricultural chemicals by blending a surplus soil produced from a construction work and being free from agricultural chemicals and heavy metals with an organic fertilizer such as a composts formed from organic wastes such as wet refuses to make a fertile vegetative soil and replacing heretofore used soil on a farm by the formed soil. SOLUTION: A surplus soil from a construction work e.g. an excavation work is analyzed on its components and properties to confirm that it is not contaminated with agricultural chemicals or heavy metals. Next, the surplus soil not contaminated with the above contaminants is blended with a compost prepared by the microbial fermentation of a starting material not contaminated with agricultural chemicals and heavy metals, such as wet refuses, residues from food processing, and wastes from agriculture and stoke farming, and the blend is cured for a suitable time to make a vegetative soil. The curing time is experimentally predetermined according to the composition of the surplus soil or the compost used and the kind of the crop to be grown. A soil in a farm or a house is replaced by the produced soil to realize a fertile soil not contaminated with agricultural chemicals and heavy metal within a short time. This makes it possible to stably supply consumers with crops not at all contaminated with agricultural chemicals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for utilizing construction surplus soil, particularly to a method for improving soil on agricultural land and a method for cultivating crops.

[0002]

2. Description of the Related Art At present, the number of compounds used as pesticides is about 600 in the world and about 450 in Japan. Some pesticides have high soil persistence. For example, organochlorine pesticides typified by DDT and BHC, which have been used in large quantities in Japan, are stable for a long period of time because of their indegradability. Thus, pesticides are still accumulating in the soil even when use is stopped. As a result, the crop may be contaminated with the pesticide, and the pesticide may be taken in and accumulated in a human body who has taken the crop.

As a technique for improving construction residual soil into vegetable soil, there is JP-A-9-25482.

[0004]

Agricultural land that has been using pesticides for many years may have accumulated pesticides in the soil. It takes two or three years for pesticides to decompose,
Crops harvested during this time may absorb pesticides.
Therefore, in order to immediately cultivate pesticide-free crops, it is necessary to replace the soil with no pesticide accumulation. But,
Most of the soil currently used as agricultural land has already been sprayed with pesticides, so it is necessary to collect it from non-farm land to obtain pesticide-free soil.

[0005] Most of the surplus construction soil has been disposed of as industrial waste. For example, there is a case where construction residue generated when excavating to construct a building contains a large amount of clay having a particle size of 5 μm or less. Such soils are too hard to allow plant roots to enter. Further, since oxygen is not supplied, it cannot be used as it is as vegetation soil for cultivating plants. Thus, most of the construction surplus soil is not suitable for cultivation. For this reason, attempts have been made to add soil amendments to improve vegetable soil,
As disclosed in JP-A-9-25482, a polymer compound may be used as a soil improving material. Such a polymer compound is
It is effective in improving soil properties, but can have a negative effect on crops.

An object of the present invention is to obtain fertile soil free of pesticides and in a short period of time. It is another object to cultivate pesticide-free crops using the soil and to provide a stable supply to consumers.

[0007]

Means for Solving the Problems To achieve the above object, the soil improvement method of the present invention comprises the steps of: converting a construction residue containing no pesticides or heavy metals into organic waste such as compost produced by decomposing organic waste such as garbage; The fertilizer was mixed with fertilizer to produce fertile vegetable soil free from pesticide contamination, and the soil was replaced with the soil used in conventional agricultural lands to improve the farmland into fertile soil free from pesticide contamination. In addition, the produced vegetable soil was filled into a biodegradable plastic container to form a unit, and the unit was carried to farmland.

[0008] In order to achieve the above object, the cultivation soil for cultivating crops for the agricultural land, the house and the planter of the present invention is obtained by decomposing organic waste such as garbage, by constructing construction residual soil containing no pesticides or heavy metals. The fertilizer was mixed with organic fertilizers such as compost to produce fertile vegetable soil free of pesticide contamination, filled into biodegradable plastic containers, and unitized.

In order to achieve the above object, a method for cultivating a crop according to the present invention comprises mixing a construction residue containing no pesticides or heavy metals with an organic fertilizer such as compost produced by decomposing organic waste such as garbage. By producing fertile vegetable soil without contamination by soil, replacing the soil of farmland or house that has been conventionally used, improving the soil of farmland or house into fertile soil without contamination by pesticides, and using this soil Cultivated crops.

[0010] In order to achieve the above object, a crop of the present invention is a pesticide produced by mixing construction residual soil containing no pesticides or heavy metals with an organic fertilizer such as compost generated by decomposing organic waste such as garbage. The plants were grown on fertile soil free from contamination by ash.

[0011]

Embodiments of the present invention will be described below.

First, the components and properties of the construction surplus soil obtained by excavation work and the like are analyzed to confirm that there is no contamination by pesticides or heavy metals. Next, compost produced by fermentation of microorganisms is mixed with raw materials that are free from pesticides and do not contain heavy metals, such as garbage, food processing residues, and agricultural and livestock wastes, and are mixed with the remaining construction soil and cured for a predetermined time. This produces vegetable soil, that is, culture soil. The mixing ratio of the compost and the compost, and the curing time vary depending on the composition of the compost and the compost, and the type of crops to be cultivated.

[0013] By replacing the produced culture soil with the soil of existing farmland or house, it is possible to obtain a soil which is free from contamination by pesticides and heavy metals in a short time, and which is fertile and has the effect of promoting plant growth. . In order to obtain soil containing no pesticides, it is desirable to replace soil of 10 cm or more from the surface of farmland.

When replacing the soil of the existing farmland or house with the culture soil produced by the above-mentioned method, the culture soil is put into a biodegradable plastic container which is decomposed by microorganisms in the soil and unitized. Can be adopted. The unitization of the culture soil makes it easier to handle and can be replaced in a short time. In addition, by spreading the unitized products on conventional farmland or the like, it is possible to obtain soil with uniform properties and to cultivate crops of stable quality without contamination by pesticides.

[0015] House soil needs to be periodically replaced to remove salt accumulation. The culture soil of the present invention can be suitably used for replacing such soil for a house.

According to the present invention, fertile soil can be obtained in a short period of time without contamination of pesticides. In addition, by using the soil, a crop without any pesticide contamination can be stably supplied to consumers.

Hereinafter, an embodiment of the present invention will be described in detail.

As the remaining construction soil, the remaining soil generated when excavating to construct a building was used. Analysis of the chemical composition of the construction surplus soil revealed that 47% of clay, 25% of silt and 20% of sand.
%. No pesticides or heavy metals were included. The compost generated from the garbage was mixed with the surplus soil. The C / N ratio of the compost was about 14, and the average particle size was about 1 mm. For the mixing, the construction waste soil and compost were mixed at a ratio of 20: 1 using a rotary kiln. After mixing, the mixture was cured under an oxygen supply for 2 weeks to produce a culture soil. The culture soil produced by this method was replaced by 20 cm from the surface of the farmland, and the improved soil was used to grow round leaf komatsuna. Cultivation of round leaves Komatsuna was carried out in a natural light type artificial weather chamber. On day 45, the height of Komatsuna Maruba is 10
It grew to more than cm and was successfully cultivated. Further, when the components in the round leaf komatsuna were analyzed, no pesticides were detected.

According to the present invention, crops free from pesticide contamination can be stably cultivated.

[0020]

According to the present invention, fertile soil can be obtained in a short time without pesticide contamination. Moreover, by using this improved soil, it is possible to cultivate a crop that is completely free of pesticide contamination and to supply it to consumers in a stable manner.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Namba 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Masahiko Ishida 7-1-1 Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Hitachi Research Laboratory, Hitachi, Ltd.

Claims (5)

[Claims] 1. A method for producing fertile vegetable soil free from pesticide contamination by mixing construction waste soil free of pesticides and heavy metals with organic fertilizer such as compost generated by decomposition of organic waste such as garbage. A soil improvement method characterized by replacing agricultural soil used for agricultural land with fertile soil free of pesticides. 2. A soil improvement method according to claim 1, wherein said vegetable soil is filled into a biodegradable plastic container to form a unit, and then the unit is carried to farmland. 3. A cultivation soil for cultivating crops for agricultural lands, houses and planters, wherein a construction residue without pesticides or heavy metals is mixed with an organic fertilizer such as compost generated by decomposing organic waste such as garbage. A fertilizer soil for crop cultivation, characterized by producing fertile vegetable soil free from pesticide contamination, filling in biodegradable plastic containers, and unitizing it. 4. A method for producing a fertile vegetable soil free from pesticide contamination by mixing construction residual soil free of pesticides and heavy metals with organic fertilizer such as compost generated by decomposition of organic waste such as garbage. By replacing the soil of the farmland or the house that had been used, the soil of the farmland or the house was improved to a fertile soil free of pesticide contamination, and a cultivation soil characterized by cultivating crops using this soil was used. Crop cultivation method. 5. A pesticide grown on a fertile soil free of pesticides produced by mixing construction residual soil free of pesticides and heavy metals with an organic fertilizer such as compost generated by decomposition of organic waste such as garbage. Crops without contamination by.