Passivating agent for reducing cadmium activity of acidic vegetable soil and use method thereof

Abstract

The invention discloses a passivating agent for reducing the cadmium activity of acidic vegetable soil and a use method thereof. The passivating agent contains the following components by weight: 31.3-46.2% of lime, 26.7-39.0% of potassium humate, and 25.0-37.8% of rice husk carbon. The use method consists of: subjecting the passivating agent to basal application totally according to a dose of 150-450kg per 667 square meters, then conducting plowing and uniform raking to make the passivating agent and contaminated soil mixed uniformly, spraying water, performing balancing for 1-3 days, and then carrying out sowing or transplanting. Through the synergistic effect of various components, the passivating agent involved in the invention can reduce the cadmium activity of the soil and the heavy metal content of vegetables, and improve the crop yield and quality, thus being able to be widely applied to remediation of acidic vegetable soil suffering moderate and mild cadmium pollution or severe pollution.

Description

technical field [0001] The invention relates to soil improvement technology and environmental protection technology, in particular to a passivator for reducing cadmium activity in acidic vegetable soil and a use method thereof. Background technique [0002] In recent years, with the rapid development of regional economy and society, a large amount of urban and rural industrial wastewater and unreasonable discharge of solid waste have caused the phenomenon of excessive heavy metals in farmland soil to become more and more serious. Especially in the southern region, the soil pH is generally low and the activity of heavy metals is high. In alkaline or neutral soil, the potential ecological risk level of Cd is the highest; the safety of agricultural products produced on farmland soil with high cadmium content or high activity is difficult to be guaranteed, and the phenomenon of excessive cadmium in vegetables occurs from time to time , leading to crop yield reduction and decline...

AI Technical Summary

Problems solved by technology

[0004] In actual production and application, due to the increased risk of heavy metal pollution in the soil, the complex relationship between soil chemical properties and crop absorption, the remediation effect of a single organic or inorganic passivator is often not ideal, and there are often unstable effects or passivator damage to soil quality

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