Application of soluble calcium salt to alleviation of accumulation of heavy metal cadmium in rice

Abstract

The invention discloses application of soluble calcium salt in alleviation of accumulation of heavy metal cadmium in rice. The application comprises the following steps of: before transplanting rice, performing soil preparation, and applying the soluble calcium salt to soil; or / and after transplanting rice and before harvesting rice, spraying the soluble calcium salt to the ground parts of rice. According to the novel application of the soluble calcium salt, the soluble calcium salt can effectively alleviate accumulation of heavy metal cadmium in rice, the cadmium content in high cadmium accumulation brown rice and low cadmium accumulation brown rice are respectively reduced by over 50% and over 80% to the highest extent, the cadmium content in brown rice are just 0.1mg / kg and 0.03mg / kg which are far lower than 0.2mg / kg regulated by the state, and the application provides a good solution to heavy metal pollution of rice. The applying time and amount of soluble calcium salt are less, so that the cost is low and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and in particular relates to the application of a soluble calcium salt in reducing the accumulation of heavy metal cadmium in rice. Background technique [0002] Cadmium is a dangerous environmental pollution element. The world releases about 30,000 tons of cadmium into the environment every year, of which 82% to 94% will enter the soil. In China, only 80 million mu of arable land is polluted by cadmium, and nearly 180 million mu of arable land is polluted by cadmium and arsenic. Long-term intake of rice, vegetables, fruits, water, etc. that are seriously polluted by cadmium will cause symptoms of chronic cadmium poisoning, and even cause cadmium to accumulate in the body, leading to "pain disease". [0003] Rice is the most important grain crop in China. 65% of Chinese people take rice as the absolute staple food. Rice is also the bulk cereal crop that absorbs the most cadmium. The cadmiu...

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Problems solved by technology

[0007] The above-mentioned patent alleviates the problem of cadmium accumulation in rice to a certain extent without affecting the normal growth and development of rice, reducing the cadmium content in brown rice to 0.058-0.39mg / kg, and the cadmium content in polished rice to 0.04-0.28mg / kg, but there are still the following problems: (1) the adjustment dosage of the application is large, and it is necessary to apply 15 to 90 kg / ha of manganese in the soil only when the soil is prepared, and the cost is high; (2 ) is applied frequently, and divalent manganese chelate regulators need to be frequently applied during the entire growth period of rice, which is cumbersome to operate and increases labor costs

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