Cycle synergistic remediation method for heavy metal polluted rice field

Abstract

The invention belongs to the technical field of rice field heavy metal remediation, and particularly discloses a cycle synergistic remediation method for a heavy metal polluted rice field, which comprises the following steps: applying an activated composite material in the paddy field, carrying out ploughing and uniform mixing, and then performing transplanting or sowing, wherein the activated composite material comprises vinasse, crop shells, a fermentation product of bacillus mucilaginosus and an ammonium nitrate compound fertilizer; spraying a foliar fertilizer at the booting stage of rice; and dressing ammoniacal nitrogen fertilizer in the heading stage of the rice. The invention creatively finds that through the combined control of the activated composite material, leaf fertilizer and ammoniacal nitrogen fertilizer in each stage in the life cycle of the rice, the heavy metal intake of the rice can be effectively promoted, the enrichment of the heavy metal can be selectively regulated and controlled, and on the premise of promoting the heavy metal repair of the rice field, heavy metals of the rice can be prevented from exceeding the standard accidentally.

Description

technical field [0001] The invention relates to the field of restoration of cultivated land polluted by heavy metals, in particular to a method for restoration of cadmium-contaminated paddy fields. Background technique [0002] my country's agricultural land resources are scarce, and the heavy metal pollution of cultivated land is mostly moderate to light pollution, and the area is extensive and the causes are complex. The pressure on food supply and food security is huge, and it is impossible to fallow large areas of polluted soil like developed countries in Europe and the United States. At present, the restoration of heavy metal-contaminated cultivated land in my country is mostly considered from the perspective of ensuring food security. Restoration technologies such as in-situ passivation, agronomic regulation, foliar barrier, and safe planting of low-accumulation crops have not fundamentally solved the problem of soil heavy metal pollution. question. Although phytoreme...

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Problems solved by technology

At present, the restoration of heavy metal-contaminated cultivated land in my country is mostly considered from the perspective of ensuring food security. Restoration technologies such as in-situ passivation, agronomic regulation, foliar barrier, and safe planting of low-accumulation crops have not fundamentally solved the problem of soil heavy metal pollution. question

Although phytoremediation technology can continuously extract heavy metals in the soil, it changes the original planting structure and is not easy to mechanize

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