Method for applying phosphate fertilizer to reduce content of mercury in rice grains of heavy mercury polluted rice field

Abstract

The invention relates to a method for applying a phosphate fertilizer to reduce the content of mercury in rice grains of a heavy mercury polluted rice field, belonging to the technical field of agricultural product heavy metal pollution prevention and treatment. The method is characterized by comprising the following steps: in the heavy mercury polluted rice field (the soil Hg concentration is 2mg/kg, which is 4 times the national limit standard), applying 100kg/hm<2> (at a middle phosphorus application level by an effective component P2O5) of the phosphate fertilizer for three times, namely, applying 1/2 of the total phosphatic fertilizer 3 days before rice transplanting, and applying 1/4 of the total phosphatic fertilizer 5 days before earing and 10 days after head sprouting respectively; throwing the phosphate fertilizer 3 days before rice transplanting, namely, uniformly throwing the phosphate fertilizer into the rice field; applying the phosphate fertilizer in a leaf surface spraying mode 5 days before earing and 10 days after head sprouting, dissolving a water-soluble phosphate fertilizer into water, and spraying 300L of water with the phosphate fertilizer to each hectare of the rice field. Compared with a common high-level one-time phosphate fertilizer application method used in practical rice production, the method has an application effect that the content of mercury in the rice grains can be greatly reduced (the content of the mercury in indica type rice is reduced by 61.54%, and the content of mercury in japonica rice is reduced by 56.67%), and the yield of rice is not greatly reduced.

Description

technical field [0001] The invention relates to a phosphate fertilizer application method for reducing the mercury content of rice grains in heavily mercury-polluted paddy fields, and belongs to the prevention and control technology of heavy metal pollution of agricultural products. Background technique [0002] In China's industrial areas and economically developed areas, with the increase of population, the development of industry and the extensive use of agricultural chemicals, the heavy metal pollution of farmland soil is becoming more and more serious. According to the survey, the area of ​​agricultural land polluted by heavy metals in the country is about 25 million hectares, and the amount of food polluted by heavy metals is as high as 12 million tons every year. The environmental protection monitoring system of the Ministry of Agriculture surveyed 82.23 million mu of land in 320 seriously polluted areas in 24 provinces and cities across the country and found that the...

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Problems solved by technology

However, there is still a lack of research on the impact of phosphorus fertilizer application level and application period on rice grain mercury content.

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