Farmland soil conditioner and preparation method thereof

Abstract

The invention belongs to the technical field of agricultural environmental conservation and restoration, and specifically discloses a farmland soil conditioner and a preparation method thereof. The farmland soil conditioner is prepared by uniformly mixing treated raw materials comprising quicklime, bentonite, zeolite and sepiolite in proportion. According to the invention, the preparation method is easy and simple to operate; the farmland soil conditioner is reasonable in formulation, has functions of restoring heavy metal pollution in soil, regulating soil acidity and alkalinity and the like, enables the contents of available cadmium and lead in polluted farmland to be decreased by 24.1%-35.1% and 28.7%-44.8% respectively, also enables the contents of available cadmium and lead in rice to be decreased by 34.9%-44.7% and 32.3%-46.1% respectively, improves the soil pH by 0.20-0.31, and is applicable to a variety of farmland soils with heavy metal pollution and serious soil acidification.

Description

technical field [0001] The present invention relates to the technical field of agricultural environment conservation and restoration, in particular to a farmland soil conditioner, and also to a preparation method of the above-mentioned farmland soil conditioner. farmland soil. 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 total excess rate of soil in my country is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1%, r...

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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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