Method for reducing rice cadmium accumulation in acid light cadmium pollution soil

Abstract

The invention discloses a method for reducing rice cadmium accumulation in acid light cadmium pollution soil. The method comprises following steps that before the acid light cadmium pollution soil isturned over, a soil pH conditioning agent is evenly broadcasted to the surface of the cadmium pollution soil, the soil is turned over, sufficient mixing is achieved, and after the soil water is balanced, nitrogen, phosphorus and potassium fertilizer is applied; in combination with transplanting cadmium low absorption rice cultivars, the conventional irrigation management is kept; according to themethod, operation is easy and reliable, a planted user can easily receive the method, after use, the effectiveness is high, soil heavy metal pollutions are prevented, and the fundamental significancein ensuring the rice quality safety is achieved.

Description

technical field [0001] The invention belongs to the field of agricultural environment, and in particular relates to a method for reducing rice cadmium accumulation in acidic mild cadmium-polluted soil. Background technique [0002] With the rapid development of social economy, the discharge of industrial "three wastes", the unreasonable use of agricultural chemicals, atmospheric deposition, vehicle exhaust, etc. have caused the heavy metal pollution to become more and more extensive, and the farmland has a large area of ​​pollution, and it is spreading. Cadmium pollution is the most serious form. The notorious cadmium (Cd) is one of the extremely toxic environmental pollution elements (Chen Huaiman, "Heavy Metal Pollution in the Soil-Plant System", Science Press, 1996). The survey data at the end of the last century showed that the national cadmium polluted cultivated land Area up to 1.33×10 4 hm 2 (Zhao Zhongqiu, Zhu Yongguan, etc.: The migration and transformation of ca...

AI Technical Summary

Problems solved by technology

There are many kinds of current remediation methods, and each method has its own advantages and disadvantages. For example, using sulfite as a soil conditioner to remediate cadmium-contaminated soil, although the effect is obvious, but there are certain limitations, due to the poor stability of sulfite , prone to oxidative denaturation, and has certain biological toxicity, and there is a risk of carcinogenicity

The use of composite passivation materials to restore cadmium-contaminated soil is more efficient, but the cost is high due to the complex material composition and high preparation process requirements, and the composite passivation materials are easy to change the soil environment due to the introduction of various material components, which increases the risk.

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