Comprehensive agronomic regulation and control method for producing rice with low heavy metal pollution

Abstract

The invention discloses a comprehensive agronomic regulation and control method for producing rice with low heavy metal pollution. The method comprises the steps that a calcium-sulfur-aluminum composite heavy metal passivating agent and base fertilizer are applied to soil of a tillage layer at one time in combination with field preparation; a Gelinmei foliage control agent is separately applied three times in the middle tillering stage, initial heading stage and complete heading stage of rice, and the dosage of each time is 150 g / mu, wherein according to an application approach, a 200-fold solution formed by diluting the Gelinmei foliage control agent with clean water is uniformly sprayed onto the leaf surfaces of rice plants; in the tillering and ripening stages of the rice, the soil water potential of a tillage layer of a rice field is kept at -15-0 KPa, and the field surface is submerged in water in other growth periods. By using the comprehensive agronomic regulation and control method, not only is the yield of the rice increased, but also the content of heavy metals Cd and Pb in the rice is effectively reduced, irrigation water is saved, and the water utilization efficiency isimproved. The method is simple in operation and especially suitable for production of rice products with low heavy metal content in broad rice fields suffering from light and moderate heavy metal pollution in red yellow soil regions of the south of China.

Description

technical field [0001] The invention belongs to the technical field of agriculture, and in particular relates to a comprehensive agronomic control method for producing rice with low heavy metal pollution. Background technique [0002] Rice is one of the most important food crops in China, with a planting area of ​​30.4 million hectares 2 , the total output reached 201 million tons, and the planting area and total output accounted for 27% and 36% of the grain respectively. Rice is the most important ration consumption crop in China, accounting for about 60% of all ration consumption, and rice ration consumption accounts for 85% of total rice consumption. Therefore, rice cultivation occupies an extremely important position in my country's food crop production. However, the problem of heavy metal pollution in farmland soil in my country is not optimistic. According to the "National Soil Pollution Survey Bulletin" (Ministry of Environmental Protection, etc., 2014), the point...

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Problems solved by technology

Although flood management during the whole growth period of rice can significantly reduce the Cd content of rice, the rice yield will also be significantly lower than that of conventional irrigation management (such as alternating wet and dry, draining and drying fields, etc.) (Xu Gakuan et al., 2007), and the water consumption will increase significantly , the water use efficiency is significantly reduced

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