Farmland soil treatment method capable of reducing content of cadmium in rice

Abstract

The invention discloses a farmland soil treatment method capable of reducing content of cadmium in rice. The method comprises the following operation steps of: 1) pre-treating a silkworm droppings organic fertilizer and silkworm droppings carbon; 2) uniformly applying the pretreated silkworm droppings organic fertilizer and the pretreated silkworm droppings carbon into a paddy field during harrowing, wherein application amount of the silkworm droppings organic fertilizer is 200-400 kg / mu, and application amount of the silkworm droppings carbon is 100-200 kg / mu; 3) repeatedly turning over the silkworm droppings organic fertilizer and the silkworm droppings carbon through a farm cultivator to sufficiently mix with soil, and transplanting rice seedlings; and 4) adopting paddy soil, wherein cadmium contamination degree is mild contamination and middle-level contamination. According to the method disclosed by the invention, adopted raw materials are wide in source, preparation is simple, and the cost is low. Content of organic substances and other nutrient elements can be improved by applying the silkworm droppings organic fertilizer and the silkworm droppings carbon; the pH value of the soil is regulated; and content of cadmium in rice is lower than a limit value (0.2 mg / kg) of Hygienic Standards for Grains.

Description

technical field [0001] The invention belongs to the technical field of farmland soil cadmium pollution control, in particular to a farmland soil treatment method capable of reducing the cadmium content of rice. Background technique [0002] The sources of cadmium pollution are mainly divided into natural sources and man-made sources. The natural sources of cadmium are mainly rocks and minerals in the natural state. Generally, the background value in the natural state is very low and will not cause harm to the human body. However, human activities are the main cause of excessive cadmium in the environment, such as the production of electroplating products and batteries. Irrigation of farmland with sewage is an important cause of heavy metal pollution in farmland. [0003] The cadmium pollution in cultivated land soil has caused the cadmium content in rice and vegetables to exceed the standard. According to the investigation, 10% of the rice sold in the market has a serious p...

AI Technical Summary

Problems solved by technology

Chemical stabilization technology is widely used in practice, but there are several issues that should be paid attention to in the actual promotion: one is the long-term stability of the heavy metal form after the use of chemical stabilizers, and the other is that the chemical agents used in the stabilization process are not stable. It will have a negative impact on the soil structure, and the third is the problem of repair cost

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