Method for reducing content of cadmium and nickel in rice

Abstract

The invention relates to the technical field of soil treatment, and discloses a method for reducing the content of cadmium and nickel in rice. The method comprises the following steps: (1) spreading a heavy metal composite conditioner in cadmium and nickel polluted soil, uniformly mixing the heavy metal composite conditioner with the soil, spreading a basic fertilizer, and then transplanting or spreading rice, wherein the heavy metal composite conditioner is porous biomass charcoal particles loaded with calcium magnesium phosphate fertilizer and calcium oxide; (2) spraying a foliar control agent from the tillering stage to the flowering stage of the rice; and (3) conducting watering and supplementing fertilizer according to the water and fertilizer conditions of the soil, and planting rice according to a conventional method. The organic-inorganic composite heavy metal composite conditioner is combined with the foliar control agent, so that the content of cadmium and nickel in the rice can be remarkably reduced, and the yield of the rice can be increased.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a method for reducing the content of cadmium and nickel in rice. Background technique [0002] According to the report of the 2014 National Soil Pollution Survey Bulletin, the total soil exceeding the standard rate in the country is 16.1%, and the pollution type is mainly inorganic, accounting for 82.8% of the total exceeding points. In the case of excessive inorganic pollutants, heavy metals such as cadmium, nickel, and mercury exceeded the standard. Among them, cadmium pollution is the highest, with a point exceeding standard rate of 7%, and it is increasing year by year. Once the soil environment is polluted by heavy metals, the activity of soil microorganisms will be reduced, which will affect the yield and quality of crops, and enter the human body or animals through the food chain to accumulate. In recent years, reports on the harm caused by cadmium and nickel to h...

AI Technical Summary

Problems solved by technology

At present, the commonly used soil heavy metal passivation conditioners have a large output, most of the passivation conditioners have relatively single ingredients and action mechanisms, and there are certain defects in the fixation of soil heavy metals; and long-term use of a single passivation conditioner is also easy to produce new soil and environmental concerns or cost prohibitive

For example, the application of lime as a passivator to the soil does not have a long-lasting effect and must be applied frequently, and long-term large-scale application of lime will cause excessive calcification of the soil, soil compaction, and may also cause problems such as crop yield reduction; and the cost of single use of biochar is too high , about 1000-2000 yuan / mu, and the decline rate is not high

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