Acidic-soil-improvement cadmium-lowering fertilizer capable of lowering cadmium content in paddy rice

Abstract

The invention discloses an acidic-soil-improvement cadmium-lowering fertilizer capable of lowering cadmium content in paddy rice. The fertilizer is prepared by sufficiently and uniformly stirring the following raw materials in percentage by weight: 8-10% of fish protein solution, 10-12% of sodium humate, 2-5% of sodium sulfide, 5-8% of potassium hydroxide, 10-15% of potassium dihydrogen phosphate, 10-15% of ammonium carbonate, 20-25% of urea and 10-35% of sucrose fermentation liquid. The acidic-soil-improvement cadmium-lowering fertilizer has the buffer function, can keep the soil pH within the range of 6.5-8.0 all the time, can not salinize the soil after long-term application, and is safe to use. The cadmium-lowering fertilizer contains abundant hydroxyl ions, and is capable of releasing sulfur ions through the fish protein solution, sodium sulfide and the like and releasing carbonate ions through the ammonium carbonate. The hydroxyl ions and cadmium ions form the cadmium hydroxide precipitate (Cd(OH)2), the sulfur ions and cadmium ions form the cadmium sulfide precipitate (CdS), and the carbonate ions and cadmium ions form the cadmium carbonate precipitate (CdCO3); the cadmium lowering effect is greatly enhanced under the combined actions of the cadmium hydroxide precipitate, cadmium sulfide precipitate and cadmium carbonate precipitate.

Description

technical field [0001] The invention belongs to the field of prevention and control of heavy metal pollution of agricultural products, and relates to a fertilizer for reducing cadmium content in agricultural products, in particular to an acidic soil improvement cadmium-reducing fertilizer for reducing cadmium content in rice. Background technique [0002] Cadmium (Cd) is a poisonous and harmful heavy metal element. After long-term absorption by the human body, it can cause bone pain and a series of chronic damages, such as high blood pressure, testicular damage, carcinogenesis, teratogenicity, anemia, bone Porosity, etc., is one of the mandatory control indicators for the quality and safety of agricultural products in my country. [0003] Rice is processed from paddy rice. It is one of the most important food products for Chinese residents and is related to the national economy and people's livelihood. In recent years, the media has reported that the cadmium content in rice ...

AI Technical Summary

Problems solved by technology

[0006] (1) Inconvenient to use: The traditional soil improvement method is to apply solid soil improver once when leveling the cultivated land before planting, but this method is not easy to measure the application amount and uniform application

[0007] (2) Lime, calcium superphosphate, plant ash, sepiolite and other solid particles are insoluble compounds, which will precipitate in large quantities when they meet water. At the same time, when mixed with soil particles, they are wrapped and blocked by a large number of soil particles. The probability of root system contact is greatly limited, and the pH adjustment effect is not ideal. Usually, a large amount needs to be added, which can lead to soil calcification and hardening, and increase the production cost of materials and labor.

[0008] (3) The growth process of crops requires constant topdressing. With the increase of chemical fertilizer application, the pH value of the soil changes at any time. It is difficult for traditional solid soil amendments to adjust the pH value of the soil in real time.

[0009] (4) Traditional solid soil amendments have single components and functions, only limited adjustment of soil pH value, no fertilizer effect

[0010] (5) Traditional solid soil amendments contain a large amount of calcium salts, which can chemically react with applied chemical fertilizers to form a large number of insoluble compounds, which will harden the soil and affect fertilizer efficiency

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