Application of monopotassium phosphate to reduce rice cadmium accumulation

Abstract

The invention discloses application of monopotassium phosphate to reduce rice cadmium accumulation. The application disclosed by the invention is as follows: monopotassium phosphate is applied to soil in the event of preparing a land before transplanting rice; or/and monopotassium phosphate is sprayed to the upper parts of rice after transplanting rice till maturing. According to the invention, novel application of monopotassium phosphate is provided; monopotassium phosphate is capable of effectively controlling cadmium accumulation in rice; monopotassium phosphate is capable of respectively reducing cadmium contents in rice cadmium high-accumulation rice Yongyou 9 and rice cadmium high-accumulation rice Xiushui 09 brown rice to be above 80% and 85% maximally; the cadmium contents in brown rice are only 0.04 mg/kg and 0.02 mg/kg and are far below nationally regulated 0.2 mg/kg; a good solving way is provided for rice heavy metal pollution; furthermore, both the application number and the application amount of monopotassium phosphate are very low; the application disclosed by the invention is low in cost and convenient for operation.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and in particular relates to the application of potassium dihydrogen phosphate 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. Th...

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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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