Safe rice production method applied to soil with medium and mild cadmium contamination

Abstract

The invention discloses a safe rice production method applied to soil with medium and mild cadmium contamination. The method comprises steps that (1), a passivator is sprayed to the soil surface of arice field, and ploughing is performed until the passivator and soil are mixed uniformly; (2), a zinc-containing compound is taken as an antagonistic element, the antagonistic element is applied during application of the passivator, the zinc-containing compound is also required to be dissolved in irrigation water at a booting stage and a grain-filling stage of rice in the rice field with medium Cadmium contamination, and then the rice field is irrigated; (3), a foliar inhibitor is applied once at a tillering stage or the grain-filling stage of rice in the rice field with mild cadmium contamination, and the foliar inhibitor is applied once at the tillering stage and the grain-filling stage of rice in the rice field with medium cadmium contamination; and (4), a part of passivator and the antagonistic element zinc are applied supplementarily to continuous multi-season rice according to actual conditions before planting, and the foliar inhibitor is sprayed every season. According to the safe rice production method, cadmium content of rice can be remarkably reduced, the operating method is simple and convenient, the effect is stable, and the rice yield is not affected.

Description

technical field [0001] The invention belongs to the technical field of safe utilization of heavy metal-contaminated soil, and specifically relates to a rice safety production method for preventing and controlling excessive cadmium in rice in medium-slight cadmium-polluted soil. Background technique [0002] At present, heavy metal pollution in soil has been widely concerned, especially heavy metal pollution in paddy fields. Excessive heavy metals in the soil can reduce the yield and quality of rice, make the content of heavy metals in rice exceed the standard, and cause harm to human health. my country is the largest rice producer in the world, with a rice planting area of ​​30.7472 million hm 2 , producing 213 million tons of rice, accounting for about 44.2% of the world's rice production. Investigation and research shows that the test of commercially available rice in 20 provinces in my country shows that the maximum cadmium content in the tested rice is 0.77mg / kg, and t...

AI Technical Summary

Problems solved by technology

[0004] Currently, in-situ passivation technology and foliar resistance control technology are commonly used in the process of large-scale remediation and treatment of medium-to-light cadmium-contaminated paddy soil. In addition, the critical growth period of rice cadmium absorption and accumulation and rice cadmium translocation has not been considered, resulting in a large amount of repair materials, short timeliness, and unstable effect of a single restoration technology, making it difficult to stably and effectively reduce rice cadmium content.

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