A method for maintaining soil fertility and controlling soil heavy metal content in an organic corn production system

Abstract

The invention discloses a method for maintaining soil fertility and controlling contents of heavy metals in soil with an organic corn production system and belongs to the field of organic production system soil fertilization. According to the method, a common mode that green manure is turned and buried into soil in the conventional organic agricultural production process is changed, soybean green manure is used together with a no-tillage technique, disturbance of agricultural measures to soil is reduced, and the accumulation of soil nitrogen and organic matters is increased; and meanwhile to alleviate the situation that nitrogen immobilized by soybean green manure cannot meet growth demands of corn, broadcasting of organic fertilizers is changed into furrow application, so that the utilization efficiency of the organic fertilizers is improved, the application amount of the organic fertilizers is reduced, and the accumulation velocity of heavy metals is controlled.

Description

technical field [0001] The invention belongs to the field of soil fertilization in an organic production system, and in particular relates to a method for maintaining soil fertility and controlling soil heavy metal content in an organic corn production system. Background technique [0002] The deterioration of the ecological environment (soil desertification, salinization, nutrient depletion, etc.) and food safety problems have indirectly promoted the development of organic agriculture. In the past ten years, the world's organic agriculture has grown at an annual rate of 20%. By the end of 2014, the global organically managed agricultural land area reached 43.7 million hectares (including the land in the conversion period), of which 1.9 million hectares were in China, ranking first. The fourth place in the world. Organic agriculture has been widely recognized worldwide as an effective way to improve soil fertility, control agricultural non-point source pollution, and increa...

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Problems solved by technology

[0006] Aiming at the problem that in the existing organic agricultural production system, simply relying on increasing the application amount of organic fertilizer to maintain soil fertility is likely to cause heavy metal accumulation, the present invention provides a method for organic corn production system that can not only maintain soil fertility but also control soil heavy metal content, Use the winter idle period (September to next April) to plant leguminous green manure to fix nitrogen. When the maximum biomass is reached, the leguminous green manure is mowed, corn is sown on demand, and organic fertilizer is applied in strips to cover the leguminous plants evenly. The bare ground between the rows instead of being overturned into the soil avoids soil disturbance caused by tillage, avoids accelerating the degradation of organic matter and reducing soil fertility

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