Paddy field irrigation method for reducing lead content of paddy

Abstract

The invention relates to a paddy field irrigation method for reducing the lead content of paddy, and belongs to the technical field of prevention and control of agricultural product heavy metal pollution. In a water control period, a living tree is transplanted to a tillering stage to control water after a paddy seedling is transplanted for 7 to 40 days, and is subjected to submerged irrigation in other stages to maintain the water layer to be between 5 and 10cm; the degree of water control is mild water control; in the view of soil appearance, the surface oil turns hard, but not turns to white, and is subjected to fine cracking; if the water content of soil is detected, the water content of soil is kept to be maximum water-holding capacity of about 80 percent (+ / -5 percent); and the selection of paddy variety is as follows: the variety of japonica rice with weak capacity of absorbing Pb in soil is suited for selecting, while the variety of nonglutinous rice or hybrid rice with strong capacity of absorbing Pb in soil is unsuited for selecting. Compared with common whole growth period submerged irrigation in paddy practical production, the method has the advantage that the Pb content of paddy is reduced by 28.4 to 43.8 percent; and compared with the common method of controlling water 10 to 15 days before mature in the paddy practical production, the method has the advantage that the Pb content of the paddy is reduced by 57.6 to 69.1 percent.

Description

technical field [0001] The invention relates to a paddy field irrigation method for reducing lead content in rice, and belongs to the technical field of heavy metal pollution prevention and control 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 low doses of Pb during pregnancy and early childhood (blood Pb concentration of 10-20 ...

AI Technical Summary

Problems solved by technology

However, these water control measures often lack scientificity. If the water control period or degree is not appropriate, it will not only cause a decrease in rice yield, but also promote the release of toxic and harmful substances in the paddy soil and increase the absorption of these substances by rice, resulting in rice production. The content of toxic and harmful substances in the human body exceeds the standard, especially in rice fields polluted by heavy metals, this situation is easy to occur

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