Method for reducing lead content in rice grains by using NPK fertilizer together

Abstract

The invention relates to a method for reducing the lead content in rice grains by using NPK fertilizer together. The method has the characteristics that in the lead-contaminated soil with severe leadcontamination of a soil lead content of 300 mg/kg which is three times or above that of the limit of the soil lead content of edible agricultural product producing areas in China, the total amount ofapplied nitrogen is 225 kg/hm<2> which is medium-level nitrogen application based on pure nitrogen, the total amount of applied phosphorus is 150 kg/hm<2> which is high-level phosphorus application based on the content of an active ingredient P2O5, and the total amount of applied potassium is 100 kg/hm<2> which is low-level potassium application based on an active ingredient K2O; application is completed in three times, and one third of the total fertilization amount is separately applied 3 days before rice planting, 25 days after rice planting and 5 days before heading. When the application effect of the method is compared with that of conventional fertilization methods for rice production, the yield of Indica rice is increased by 5.99%, the yield of japonica rice is increased by 6.96%, the lead content of grains of Indica rice is decreased by 81.61%, and the lead content of grains of japonica rice is decreased by 77.68%.

Description

technical field [0001] The invention relates to a method for reducing the lead content of rice grains in combination with nitrogen, phosphorus and potassium fertilizers, and belongs to the technology for preventing and controlling heavy metal pollution of crops. 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 of 10...

AI Technical Summary

Problems solved by technology

Studies have shown that different application rates and methods of nitrogen, phosphorus, and potassium fertilizers have different effects on Pb accumulation in rice grains, but there is no report on the effects of combined application of nitrogen, phosphorus, and potassium fertilizers on rice grains Pb accumulation

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