Method for improving soil and preventing rice from absorbing heavy metal by utilizing steel slag

Abstract

The invention discloses a method for improving soil and preventing rice from absorbing heavy metal by utilizing steel slag. A month before rice seedlings are transplanted, the steel slag is applied in the soil and sufficiently and uniformly mixed with the soil, watering is carried out, and the flooded state is kept to wait for the transplantation of the rice seedlings. By utilizing the steel slag as an alkaline industrial byproduct rich in silicon to serve as soil amendment and regulating the chemical and biological processes of the acidic mineral water-polluted soil (improving the acidity of the soil and decreasing the activity of heavy metal) and the silicon-loving rice crop (regulating the behavior change of the heavy metal in the rice through the silicon) serving as two subsystems, the method improves the soil environment and reduces the heavy metal absorption of the rice, thus realizing the dual benefits of improving the polluted farmland soil and increasing the eating safety of the rice.

Description

[0001] technical field [0002] The invention relates to a technology for remediating heavy metal polluted soil and reducing the heavy metal content of agricultural products, in particular to a method for using steel slag to improve soil and prevent rice from absorbing heavy metals. Background technique [0003] With the rapid development of society and economy, the human demand for mineral resources is increasing day by day, and the environmental problems brought about by mining activities are becoming more and more serious. The unreasonable discharge of acidic mineral water formed during mining and metal smelting has led to ecological degradation in mining areas and serious pollution of farmland. Acid mine water polluted farmland mainly has two problems: extremely acidic pH value and high heavy metal content. Heavy metal pollution of farmland not only leads to soil degradation, but also threatens human health through the food chain. It is particularly worth noting that d...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the existing heavy metal-contaminated farmland restoration technology, and provide an effective method for directly using steel slag, a by-product of silicon-rich industry, to block rice from absorbing heavy metals and increase its yield