Silicon application method for reducing lead concentration of rice in rice field with severe lead contamination

Abstract

The invention relates to a silicon application method for reducing lead concentration of rice in rice field with severe lead contamination and belongs to the technical field of prevention and control of heavy metal contamination of agricultural products. According to the method, silicon is applied twice in rice field with severe lead contamination, wherein the total silicon application amount is 300kg / hm<2>, metered by the effective component SiO2, and Pb concentration of soil is 1000mg / kg; Specifically, two thirds of the total silicon application amount is applied three days before rice seedlings are transplanted and one third of the total silicon application amount is applied five days before heading. When the application effect of the method is compared with that of common method without silicon application (control) in actual rice production, the method has the advantages that the Pb concentration of rice is greatly reduced (the Pb concentration of indica rice is reduced by 92.2 percent, and the Pb concentration of japonica rice is reduced by 85.8 percent), the rice yield is remarkably increased (the yield of indica rice is increased by 9.3 percent, and the yield of japonica rice is increased by 5.8 percent).

Description

technical field [0001] The invention relates to a silicon application method for reducing the lead concentration of rice in heavily lead-polluted paddy fields, and belongs to the technology for preventing and controlling heavy metal pollution of agricultural products. Background technique [0002] Among all heavy metal pollutants, lead (Pb) has received the highest degree of attention, because Pb is widely used and has become the metal element with the largest pollution area. On the earth, there is almost no place that is not polluted by Pb, and even the Pb content of the Arctic ice is 10-100 times that of prehistoric ice, and the Pb content of the Antarctic ice is 10 times higher than that of the Arctic ice. [0003] Excessive Pb has toxic effects on various organs such as the central nervous system, red blood cells, kidneys, cardiovascular and reproductive systems of men and women. Long-term experiments have shown that exposure to lower doses of Pb (blood Pb concentration...

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Problems solved by technology

Studies have shown that silicon application in paddy fields will reduce the absorption of Pb in rice, but there are no public reports on the impact of silicon application levels in paddy fields and selenium application periods on rice Pb concentrations, so there is a lack of paddy field application to reduce Pb concentrations in rice. silicon method

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