A method for reducing the lead content of rice through combined application of silicon and phosphorus fertilizers
A technology of lead content and phosphate fertilizer, applied in the direction of fertilization method, application, rice cultivation, etc., can solve the problems of reducing the Pb content of rice
Inactive Publication Date: 2019-01-15
CHANGZHOU UNIV
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Some studies have shown that applying silicon and phosphorus in rice fields can reduce the absorption of Pb by rice and reduce the Pb content of rice, but there is no report on the effect of combined application of silicon and phosphorus fertilizers on rice Pb accumulation
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Embodiment 1
[0012] Example 1: A method for reducing the lead content of rice by the combined application of silicon and phosphate fertilizers, in the entire rice production cycle, the total amount of silicon applied is 90kg / hm 2 (with the active ingredient SiO 2 In total, the medium level of silicon application), the total phosphorus application rate is 100kg / hm 2 (with active ingredient P 2 O 5 1 / 3 of the total amount of silicon and phosphorus were applied 3 days before rice, 20 days after planting, and 50 days after planting. Before applying silicon and phosphate fertilizers, fill the soil with a thin water layer (3-5cm), evenly spread silicon and phosphate fertilizers into the soil, and let the water layer dry out naturally before irrigating.
[0013] Due to the different sources of silicon, the active ingredients of phosphate fertilizer products (SiO 2 , P 2 O 5 ) content is different, when applying silicon and phosphate fertilizers, the specific application amount should be cal...
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The invention relates to a method for reducing the lead content of rice through combined application of silicon and phosphorus fertilizers, belonging to the technical field of crop heavy metal pollution prevention and treatment. The method is characterized in that a medium-silicon medium-phosphorus fertilization combination is adopted for lead polluted soil (with the Pb content of the soil being 300 mg / kg, belonging to a heavy pollution level), the total silicon fertilization amount is 90 kg / hm<2> (calculated based on an effective component SiO2, adopting a medium silicon fertilization level),and the total phosphorus fertilization amount is 100 kg / hm<2> (calculated based on an effective component P2O5, adopting a medium phosphorus fertilization level). The silicon and phosphorus fertilizers are applied in three times, namely applying one third of the total silicon and phosphorus fertilization amounts respectively 3 days before rice seedlings transplanting, 20 days after seedling transplanting, and 50 days after seedling transplanting. Compared with no silicon or phosphorus fertilization in actual rice production, the method has effects that the nonglutinous rice yield is increasedby 21.70%, the japonica rice yield is increased by 19.56%, the lead content of nonglutinous rice is decreased by 78.31% and the lead content of japonica rice is reduced by 68.89%.
Description
technical field [0001] The invention relates to a method for reducing the lead content of rice by combined application of silicon and phosphate 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. There are few places on Earth that are not contaminated with Pb, and even the Pb content of the Arctic ice is 10-100 times that of the 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 10-20 μg / dl) ...
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Login to View More IPC IPC(8): A01C21/00A01G22/22
CPCA01C21/005A01G22/22
Inventor 刘建国储凯强张烜华
Owner CHANGZHOU UNIV