Irrigation method for reducing arsenic concentration of rice in fields with severe arsenic pollution

Abstract

The invention discloses an irrigation method for reducing the arsenic concentration of rice in fields with severe arsenic pollution and belongs to the technical field of agricultural product heavy metal pollution prevention. According to the irrigation method for reducing the arsenic concentration of the rice in the fields with severe arsenic pollution, in the rice fields with severe arsenic pollution at a soil arsenic concentration o 100 mg/kg, a water controlling period covers the rice tillering period to the heading period of rice and 21 days after the heading period to the mature period, and in the others periods, submerging irrigation is performed, and the water layer is maintained to be 3-5 cm; the control level during the water controlling period is low; viewed from the outside, surface soil hardens and generates tiny cracks but not whitens; the soil water content is measured to be 75%-85% of the maximum water holding capacity. Compared with full-period submerging irrigation methods generally used during actual rice production, the irrigation method for reducing the arsenic concentration of the rice in the fields with the severe arsenic pollution can reduce the arsenic concentration by 58%-69%.

Description

technical field [0001] The invention relates to an irrigation method for reducing the rice arsenic concentration in a heavily arsenic-polluted paddy field, which belongs to the prevention and control technology of heavy metal pollution of agricultural products. Background technique [0002] Over the past thirty years, due to the rapid development of mining, smelting and other industries and the extensive use of arsenic-containing pesticides, fertilizers, and biological growth regulators, farmland soil in many countries and regions in the world has been polluted by arsenic. The arsenic accumulated in the rice field soil can be absorbed by the rice root system, and then transported to the human edible part - rice, and then enters the human body through the food chain, posing a serious threat to human health. In addition, my country is also a big energy country, and its energy structure is dominated by coal, which is the most polluting energy. The arsenic content in some coals...

AI Technical Summary

Problems solved by technology

However, these water management measures are often unscientific. If the irrigation method is improper, it will not only cause a decrease in rice yield, but also promote the release of toxic and harmful substances in the paddy soil and increase the absorption of these substances by rice. The content of harmful substances exceeds the standard

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