Conditioner for repairing farmland soil polluted by heavy metals and preparation method

Abstract

The invention belongs to the technical field of agricultural environment conservation and repair, and particularly discloses a conditioner for repairing farmland soil polluted by heavy metals and a preparation method. The processed raw materials such as quick lime, zeolite, sepiolite and calcium magnesium phosphate fertilizer are uniformly mixed proportionally, so as to obtain the conditioner. The conditioner provided by the invention is reasonable in formula, the method is feasible, the operation is simple, and the conditioner integrates the functions of repairing soil with heavy metal pollution, regulating and controlling the soil acidity and alkalinity, and the like, enables the effective state cadmium and lead in polluted farmland to be reduced by 22.4%-31.4% and 26.3%-43.5% respectively, enables the contents of cadmium and lead in rice to be reduced by 33.2%-38.9% and 29.4%-44.6% respectively, the pH of soil to be increased by 0.16-0.27 and the yield of rice to be improved by 3.6%-6.3%, and is applicable to various farmland soil seriously polluted by heavy metals and seriously acidified.

Description

technical field [0001] The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a conditioner for improving heavy metal-contaminated farmland soil, and also relates to a preparation method for the above-mentioned conditioner for improving heavy metal-contaminated farmland soil. The conditioner is suitable for various Farmland soils polluted by heavy metals and severely acidified. Background technique [0002] With the rapid development of modern technology and economy, the discharge of industrial "three wastes", sewage irrigation, agricultural sludge, and long-term unreasonable application of pesticides and chemical fertilizers have caused heavy metal pollution in farmland soil and become a problem that has attracted widespread attention. Heavy metals in soil can be absorbed by plants and enter the food chain, posing a serious threat to human health. According to the National Soil Pollution Survey Bulletin, the ...

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Problems solved by technology

However, the commonly used conditioners have their own limitations. For example, long-term application of phosphorus-containing materials can make the soil strongly alkaline and induce eutrophication of the water body; Risk of toxicity to crops; organic materials can reduce the availability of heavy metals when they are first applied to the soil, but with the mineralization and decomposition of organic matter, it may lead to the re-release of adsorbed heavy metal ions

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