A Soil Improver for Preventing and Controlling the Accumulation of Heavy Metal Arsenic and Zinc in Pakchoi

Abstract

The invention relates to a soil conditioner for preventing and controlling accumulation of heavy metals arsenic and zinc in cabbages. The soil conditioner is a mixture of silkworm excrement, mulberry leaf residues, quicklime and a silicon-calcium fertilizer, wherein the ratio of all the components in percentage by weight is 1:2:2:1. A pretreatment method of the soil conditioner comprises the following steps: collecting the natural mixture of silkworm excrement, mulberry leaf residues and quicklime, stacking in a shady and cool rainproof place for 5-6 months, drying in air, crushing until the particle size is less than 2mm, and mixing according to the ratio. According to the method, the soil conditioner is used for improving the polluted soil which is used for planting the cabbages; after the cabbages are planted in the improved soil, the content of the arsenic and the zinc in the over-ground parts of the cabbages is reduced obviously so that the arsenic content of the cabbages is qualified, simultaneously the toxicity of arsenic and the zinc to the cabbages is alleviated, and the growth of the cabbages is greatly promoted, so high yield of the cabbages is realized.

Description

Technical field [0001] The invention belongs to the technical field of environmental pollution control and agricultural product quality safety, and specifically discloses a soil conditioner that prevents the accumulation of heavy metal arsenic and zinc in Chinese cabbage. Background technique [0002] The area of ​​farmland polluted by heavy metals in my country has reached 20 million hectares, accounting for 1 / 5 of the cultivated land area. The annual reduction of grain output due to soil pollution is as high as 10 million tons, and the direct economic loss amounts to more than 10 billion yuan. The mining and smelting of arsenic and arsenic-containing metals, the production of arsenic or arsenic compounds as raw materials, the production of arsenic or arsenic compounds, the production of arsenic-containing wastewater, waste gas and waste residues from the production of arsenic or arsenic compounds as raw materials and the burning of coal, and the use of arsenic-containing pestic...

AI Technical Summary

Problems solved by technology

However, the previous research only mentioned the impact of single application of silkworm excrement on the lead and cadmium polluted soil itself, and did not provide the impact on crops. The final effect of the amendment depends on the changes in the heavy metal content of the crops.

At the same time, the separation of silkworm excrement from the natural mixture of silkworm excrement, mulberry leaf residues, and quicklime requires labor and effort, and also produces a certain amount of waste.

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