Sulfur-coated slow-release selenium-rich fertilizer and preparation method thereof

Abstract

The invention discloses a sulfur-coated slow-release selenium-rich fertilizer and a preparation method thereof. The sulfur-coated slow-release selenium-rich fertilizer comprises the following components in parts by weight: 10-20 parts of urea, 20-40 parts of ammonium chloride, 10-20 parts of monoammonium phosphate, 15-30 parts of potassium nitrate, 0.5-1.0 part of sodium selenite, 20-40 parts of humic acid, 4-8 parts of natural polysaccharide nano-microspheres, 1-3 parts of sulfur, 0.1-1 part of a sealant and 0.5-1.5 parts of a microbial additive. The preparation method comprises the steps of spraying fused sulfur to a surface layer of a selenium-rich fertilizer by virtue of a roller so as to obtain a sulfur layer with uniform and fixed thickness, and carrying out air cooling on coated particles in a stepped air cooling manner, so as to obtain the sulfur-coated slow-release selenium-rich fertilizer. According to the sulfur-coated slow-release selenium-rich fertilizer, slow-release and controlled release effects can be reached and a certain preventive effect to diseases and pests is achieved; and the fertilizer is rich in selenium, so that the organic selenium content of plants is effectively increased, and the crop yield is increased.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a sulfur-coated slow-release selenium-enriched fertilizer and a preparation method thereof. Background technique [0002] my country is a big consumer of chemical fertilizers, with a total annual consumption of more than 41 million tons. Selenium is one of the essential trace elements for humans and animals. The lack or excessive intake of selenium in humans or animals can cause certain diseases, such as Keshan disease, Kashin-Beck disease, cardiomyopathy, and cancer in selenium-deficient areas. Very high, selenium can significantly reduce the incidence of breast cancer, skin cancer, colon cancer, liver cancer and other cancers. Selenium plays an inherent key role in human health. Strengthening the development of selenium-rich foods has important commercial and economic value , can enhance the people's physique. Traditional selenium sources are mainly inorganic ...

AI Technical Summary

Problems solved by technology

Traditional selenium sources are mainly inorganic selenium and mineral selenium. Inorganic selenium is highly toxic and causes serious damage to plants, while the content of mineral selenium is unstable, and the absorption efficiency of plants is not high, which is easy to pollute the soil.

Ordinary granular selenium-enriched fertilizers release nutrients quickly after being applied to the soil, which is too high in the early stage and too low in the later stage, which is not conducive to the balanced absorption of crops, resulting in low fertilizer utilization; coated fertilizers are divided into inorganic coatings according to different coating materials. Fertilizers, Organic Coated Fertilizers and Degradable Coated Fertilizers

But at present, the coating is mostly used in urea, and it has not been effectively used in the field of selenium-rich fertilizers