Nitrogen application method capable of lowering lead concentration of rice in severe lead polluted rice field

Abstract

The invention relates to a nitrogen application method capable of lowering the lead concentration of rice in a severe lead polluted rice field and belongs to the technical field of heavy metal pollution prevention and control of agricultural products. Specifically, in the severe Pb polluted rice field (the Pb concentration of soil is 1000mg / kg, reaching more than or equal to three times of national limitation standards), the total nitrogen application amount is 300kg / hm<2> (the application amount is a high nitrogen application level and is metered by pure nitrogen); and nitrogen is applied by three times, 1 / 4 of the total nitrogen application amount (a base fertilizer) is applied 3 days before rice seedlings are planted, 1 / 2 of the total nitrogen application amount (a tillering fertilizer) is applied 20 days after the seedlings are planted, and 1 / 4 of the total nitrogen application amount (a granular fertilizer) is applied 5 days before head sprouting. Compared with the application effect of a common disposable middle-level nitrogen application method in actual production of rice, the application effects have the following characteristics that the Pb concentration of the rice is greatly reduced (non-glutinous rice is reduced by 78.2% and japonica rice is reduced by 68.3%); and the yield of the rice is obviously improved (the non-glutinous rice is improved by 9.7% and the japonica rice is improved by 9.1%).

Description

technical field [0001] The invention relates to a nitrogen fertilization 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 concentrat...

AI Technical Summary

Problems solved by technology

However, there is still a lack of research on the impact of nitrogen fertilizer application level and application period on rice Pb content, so there is a lack of nitrogen application methods to reduce the Pb concentration in rice.

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