Selenium-rich humic acid slow-release compound fertilizer for peanuts and preparation method thereof

Abstract

The invention discloses a selenium-rich humic acid slow-release compound fertilizer for peanuts and a preparation method thereof. The compound fertilizer is prepared from the following raw materials in parts by weight: 280-330 parts of urea, 100-355 parts of potassium sulfate, 120-200 parts of calcium magnesium phosphate fertilizer, 80-200 parts of monoammonium phosphate, 40-60 parts of selenium-containing humic acid, 1-10 parts of ferrous sulfate, 1-10 parts of zinc sulfate, 1-10 parts of EDTA chelated manganese, 0.1-0.5 parts of ammonium molybdate and 1-10 parts of borax. The preparation method comprises the following steps: adsorbing humic acid and a selenium-containing solution to prepare selenium-containing humic acid; adding urea into a melting tank for melting; adding the other rawmaterials except the calcium magnesium phosphate fertilizer, mixing the raw materials well and granulating the mixture; cooling and screening the obtained particles, and mixing the particles with thecalcium magnesium phosphate fertilizer well; and coating the mixture with humic acid to obtain the selenium-rich humic acid slow-release compound fertilizer for peanuts. The compound fertilizer has aslow release effect, is rich in various medium trace elements and beneficial elements necessary for growth and development of plants, and promotes healthy and strong growth of plants.

Description

technical field [0001] The invention belongs to the field of fertilizers, in particular to a selenium-rich humic acid slow-release compound fertilizer for peanuts and a preparation method thereof. Background technique [0002] Peanut is one of the important economic crops in my country, and the annual fertilization accounts for a large proportion. Most of the soils in Hubei are brown-red soil, yellow-brown soil and yellow cinnamon soil, which are more suitable for peanut planting. Therefore, peanuts have become an important industry in Hubei Province, especially in Dangyang, Yichang. However, there are still problems such as low peanut yield, low quality and insufficient competitiveness. [0003] At present, peanut fertilizers have the following problems: [0004] 1. Fertilizer efficiency: low fertilizer efficiency, low content of trace elements required for peanut nutrition, resulting in poor peanut quality, low oleic acid / linoleic acid (0 / L) ratio, poor storability, and ...

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Problems solved by technology

[0004] 1. In terms of fertilizer efficiency: low fertilizer efficiency, low content of trace elements required for peanut nutrition, resulting in poor peanut quality, low oleic acid / linoleic acid (0 / L) ratio, poor storability, excessive flavomycin content and pesticide residues, The low consumption rate and the lagging development of deep processing industry and other quality problems have become the key factors hindering China's peanuts from responding to the international market;

[0005] 2. In terms of fertilizer utilization rate: low utilization rate, continuous farming, and continuous large-scale fertilization lead to slow growth and development of peanuts, short plants, few fruits, and low fruit weight, which is not conducive to increasing peanut production and destroys the structure of the soil;

[0006] 3. In terms of environmental pollution: farmers fertilize a large amount of peanut crops, but the ratio of nitrogen, phosphorus and potassium is unreasonable, soil nutrients are unbalanced, nitrate leaching causes groundwater pollution, and nitrogen lost by denitrification causes damage to the atmospheric ozone layer. Excessive The use of chemical fertilizers and pesticides has caused air pollution to become more and more serious

[0007] 4. Most slow-release fertilizer coatings on the market cannot be completely degraded, such as epoxy resin, polyurethane, polyethylene, polypropylene, polyvinyl chloride and other coatings will remain in the soil and pollute the environment

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