Compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and preparation method thereof

Abstract

The invention discloses a compound fertilizer capable of reducing cadmium content in rice with overproof cadmium and a preparation method thereof. The fertilizer is prepared from urea, ammonium chloride, ammonium sulfate, diammonium phosphate, nitrophoska, a calcium magnesium phosphate fertilizer, potassium chloride, zinc sulfate, sepiolite, ferrimganic oxide, kaolin, bentonite and power plant slags in a certain proportion. The preparation method comprises the following steps: A, preparing the sepiolite; B, preparing the ferrimganic oxide; C, preparing the kaolin; D, preparing the bentonite; and E, preparing the power plant slags. In addition, scale production is carried out by a compound fertilizer process flow namely extrusion and granulation. The compound fertilizer is characterized in that 38.5-50.5% of passivator such as sepiolite, ferrimganic oxide, calcium magnesium phosphate fertilizer, kaolin, bentonite, power plant slags and the like (wherein the sepiolite accounts for 20-32.5%) are contained; the content of the total nutrition (N+P2O5+K2O) is 25%, the soil activated cadmium in the rice with the overproof cadmium is reduced by 31.9-58.5%, rice cadmium is reduced by 28.7-51.7% (the content is less than 0.2mg / kg); and the compound fertilizer has huge popularization and application value in light-grade cadmium-polluted areas.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to a compound fertilizer that can effectively reduce the cadmium content in rice fields with cadmium exceeding the standard, and also relates to the preparation of a compound fertilizer that can reduce the cadmium content in rice fields with cadmium exceeding the standard method, which is suitable for rice production in heavy metal-polluted areas, especially lightly cadmium-polluted areas. Background technique [0002] With the continuous advancement of industrialization and urbanization, the problem of heavy metal pollution in my country's soil has been paid more and more attention by people. According to relevant reports, in the early 1980s, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercury, arsenic, chromium, and nickel in my country was only 2.67 million hm 2 , increased to 6.67 mi...

AI Technical Summary

Problems solved by technology

The research results of Chen et al. (2000) showed that the addition of manganese oxide can reduce the content of cadmium extracted from EDTA, HAc and Hal in the soil, and reduce the absorption of cadmium in the aboveground parts of crops; the addition of iron oxide can also effectively reduce the content of cadmium extracted from HAc , also has a greater inhibitory effect on the absorption of cadmium in the aboveground part of crops, but its effect is weaker than that of manganese oxide

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