Water-soluble fertilizer capable of absorbing cadmium in foliage resistance and control paddy rice and preparation method and application thereof

Abstract

The invention discloses a water-soluble fertilizer capable of absorbing cadmium in foliage resistance and control paddy rice. The water-soluble fertilizer comprises the following components in percentages by weight: 17% to 22% of amino acids, 5% to 6% of polyglutamic acids, 19% to 28% of a metal chelate compound, 0.5% to 0.8% of a complexing agent and 5% to 8% of a surface active agent. The invention also discloses a preparation method of the water-soluble fertilizer. The preparation method comprises the following steps: (1) adding amino acids and polyglutamic acids into water, heating and stirring to obtain a mother solution A; (2) in a stirring condition, adding the metal chelate compound and the complexing agent into the mother solution A, and obtaining a mother solution B after complete dissolution; (3) in the stirring condition, adding the surface active agent into the mother solution B, and obtaining the water-soluble fertilizer product after complete dissolution. By using the water-soluble fertilizer, the cadmium content of paddy rice can be reduced, the cadmium content of paddy rice accords with the standard of edible safety, the production increase and quality increase ofpaddy rice are promoted, and secondary pollution to the environment is avoided.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a water-soluble fertilizer capable of preventing and controlling the absorption of cadmium in rice and its preparation method and application. Background technique [0002] In recent years, human activities (such as industrial production, mining, automobile exhaust, etc.) have significantly increased the content of heavy metals in the natural and agricultural environments, and heavy metal pollution has become a major ecological problem facing human beings. Cadmium is a heavy metal element with extremely high biological toxicity. It migrates very actively in the environmental system. It has been listed as one of the priority pollutants by the United Nations Environment Programme, the World Health Organization and the American Council of Agriculture. Cadmium enters the human body through the soil-plant-(animal)-human food chain, thereby causing a series...

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Problems solved by technology

[0004] In recent years, researchers have successively developed a variety of new technologies and methods that can reduce the absorption and accumulation of available cadmium in the soil environment by rice. The measures taken are mainly as follows: First, the cadmium is directly removed from the soil by physical methods , such as the "customer-soil method"; this measure is difficult to promote on a large scale due to the large funds required for engineering restoration

The second is to use chemical methods to change the form or valence state of cadmium in the soil, and transform it into a compound or mineral phase form that is not easily soluble, has low migration ability and low toxicity, such as using chemical in-situ stabilization technology; this measure will damage the soil. Heavy, the necessary medium and trace elements in the soil also precipitate, resulting in a lack of nutrients

The third is bioremediation, such as planting cadmium superaccumulative plants such as Sedum sedum to repair soil; this measure is difficult to treat later because of the low biomass of superaccumulative crops.

At present, the common foliar fertilizers on the market generally have the disadvantages of poor isolation effect or inability to reduce the cadmium content of crops, and cannot promote the absorption of beneficial trace elements by crops. Environmentally friendly water-soluble fertilizers that absorb and enrich are of great significance and have good market application prospects

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