Method for reducing cadmium pollution risk for rape

Abstract

The invention provides a method for reducing cadmium pollution risk for rape. According to the method, clay mineral sepiolite or montmorillonite and organic fertilizer chicken manure are applied to middle-level and mild cadmium pollution vegetable fields and are fully evenly mixed; cadmium-rejecting rape breed Hualv Number Two is planted after stabilization for 10-30 days so as to remarkably reduce the cadmium pollution risk for the rape. According to the method, the cadmium-rejecting rape breed and a soil passivator having high passivation capability on cadmium pollution are combined, the cadmium-rejecting rape breed has the advantage of low cadmium accumulation amount; the clay mineral and the organic fertilizer can remarkably reduce content of effective state cadmium of the soil by adsorption, ion exchange and complex reaction, and soil self-cleaning capability and soil fertility conditions are improved simultaneously. By combining the cadmium-rejecting rape breed, the soil passivator, the clay mineral and the organic fertilizer, bio-availability of cadmium can be remarkably reduced, accumulation of cadmium in the rape is further reduced, and the popularization application range of the cadmium-rejecting breed is expanded. The method has the advantages of being good in effect, wide in raw sources, low in cost and wide in applied range.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment of soil heavy metal pollution, in particular to a method for reducing the risk of cadmium pollution in rapeseed. Background technique [0002] With the rapid development of industry and agriculture and the acceleration of urbanization, the soil environment has been increasingly polluted by heavy metals, which has caused great harm to the sustainable development of agriculture and human health. According to statistics, the area of ​​cultivated land polluted by heavy metals such as Cd, As, and Pb in my country is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area; among them, 10 million hectares of cultivated land is polluted by industrial "three wastes", and the area of ​​farmland polluted by sewage irrigation 3.3 million hectares. In my country, more than 10 million tons of grain are reduced each year due to heavy metal pollution, and the amount ...

AI Technical Summary

Problems solved by technology

In recent years, although some studies have shown that there are significant differences in the tolerance and accumulation ability of different genotypes of rapeseed to heavy metal Cd, there are few reports on the screening of rapeseed Cd-rejecting varieties; and for the characteristics of a large amount of Cd enrichment in rapeseed, the existing technology There is also no soil passivation agent that can effectively reduce the risk of cadmium pollution, let alone a passivation agent that is suitable for regulating the safe production of cadmium-excluded rapeseed varieties

Images