Fertilizer applying method for controlling heavy metal cadmium accumulation of rice

Abstract

The invention relates to a fertilizer applying method for controlling the heavy metal cadmium accumulation of rice and belongs to the technical field of rice planting. The method comprises the following steps that 1) the land preparation is carried out before the seedling transplanting, and sulfides are applied into soil and are fully and uniformly mixed with the soil; or the land preparation is carried out before at least 15 days of the seedling transplanting, sulfates are applied into the soil and are fully mixed with the soil, and the rice field is kept to be in a waterflooding state; 2) during the first top application in the rice production, the sulfides are scattered and applied, and in addition, the soil is kept to be in the waterflooding state; 3) the sulfides or the sulfates are applied according to steps 1) and 2) during the rice planting in each time in the first year or the second year, the method and the step for applying the sulfides or the sulfates after the second year are the same as those of 1) and 2), but the application quantity is halved or is reduced by 3 / 4, or the sulfides or the sulfates are applied according to the steps 1) and 2) every two years after the second year. The fertilizer applying method has the advantages that sulfur fertilizers with wide resources are used, the consumption is low, the price is low, the use cost is low, and the cadmium content in the rice can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and in particular relates to a fertilization method for controlling the accumulation of heavy metal cadmium in rice. Background technique [0002] As a toxic heavy metal, cadmium has become more and more polluting to crops, and the polluted area of ​​farmland is expanding day by day, which has aroused widespread concern in the society. In recent years, due to industrial "three wastes", sewage irrigation, and large-scale application of pesticides and fertilizers, the pollution of heavy metals in farmland has intensified, and the safety of heavy metals in rice has become increasingly prominent. According to the results of the 2002 and 2003 rice quality and safety surveys conducted by the Rice and Product Quality Supervision, Inspection and Testing Center of the Ministry of Agriculture, one of the quality and safety problems of rice is that heavy metals such as cadmium and lead exceed the stan...

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Problems solved by technology

However, the use of chelated divalent metals is relatively large, and the price is high, resulting in high costs

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