Method for repairing cadmium-polluted farmland while conducting production

Abstract

The invention discloses a method for repairing cadmium-polluted farmland while conducting production, belonging to the technical field of environmental management of polluted soil. The method comprises the following steps: (1) intercropping sedum alfredii hance and Lingxiyicun broad beans on to-be-remediated soil; (2) spraying a cadmium activating agent to leaves of the broad beans and the sedum alfredii hance in the seedling stage and the flowering stage of the broad beans, and completely removing straws of the broad beans and the sedum alfredii hance after harvesting; (3) leveling the soil,applying a cadmium passivation conditioner, and uniformly mixing the cadmium passivation conditioner with plough layer soil; (4) after one week, transplanting rice Zhongzheyou No.8 , carrying out flooding treatment in the whole growth period, spraying a selenium-enhanced cadmium blocking and controlling agent on leaf surfaces in the tillering period and the booting period of the rice, draining water one week before harvesting, and completely removing straws after harvesting the rice; and (5) repeating the steps (1)-(4) until soil safety reaches the standard. According to the method, the sedumalfredii hance and the broad beans are intercropped and then are subjected to crop rotation with the rice, and various agricultural and strengthening measures are cooperatively conducted, so remediation of cadmium-polluted soil is completed while safe production of crops is guaranteed.

Description

technical field [0001] The invention relates to the technical field of contaminated soil environment treatment, in particular to a method for repairing cadmium-contaminated farmland while producing by using broad bean / sedum sedum intercropping combined with rice rotation. Background technique [0002] my country's farmland is seriously polluted by cadmium, and the area is increasing year by year, and the degree is increasing. It has become one of the severe environmental problems currently facing. Cadmium has strong mobility, high bioconcentration coefficient, easy absorption and long-lasting toxicity. Cadmium in farmland affects plant growth and reduces crop yield and quality. Moreover, cadmium accumulated in the edible parts of crops will eventually enter the human body through the food chain, endangering human health. Therefore, how to control cadmium-contaminated soil, reduce its enrichment in the edible parts of crops, and improve grain yield and quality has aroused w...

AI Technical Summary

Problems solved by technology

Cadmium in farmland is easily absorbed by rice, transported and eventually accumulated in rice, leading to food security problems such as excessive cadmium in rice

Images