Special long-acting slow release composite fertilizer for cotton

Abstract

The invention discloses a special long-acting slow release composite fertilizer for cotton, and relates to the field of a composite fertilizer. The composite fertilizer is prepared from a composite fertilizer nutrient and a slow release coating film, wherein the composite fertilizer nutrient is prepared from the following raw materials in parts by weight: 100 to 160 parts of bauxite modified edible fungus dregs, 80 to 100 parts of manure organic fertilizers, 40 to 60 parts of urea, 35 to 55 parts of monocalcium phosphate, 20 to 35 parts of ammonium phosphate, 10 to 15 parts of molybdenum trisulfate, 16 to 22 parts of potassium chloride, 13 to 18 parts of copper sulfate, 22 to 28 parts of ammonium chloride, 6 to 10 parts of potassium sulphate, 16 to 20 parts of sodium nitrate and 28 to 36 parts of crop straws; the slow release coating film is prepared from the following raw materials in parts by weight: 60 to 80 parts of polylactic acid, 30 to 40 parts of starch, 25 to 45 parts of bamboo fiber composite polyhydroxybutyrate, 30 to 40 parts of polyvinyl alcohol, 10 to 15 parts of hydroxymethyl propyl cellulose and 5 to 6 parts of propylene glycol methyl ether acetate; the composite fertilizer contains organic fertilizers and inorganic fertilizers; meanwhile, the release speed of the composite fertilizer is low; the fertilizer waste and the excessive development of the cotton rootsystem cannot be caused; the slow release film has degradation performance; the pollution cannot be caused on the land.

Description

Technical field: [0001] The invention relates to the field of compound fertilizers, in particular to a special long-acting slow-release compound fertilizer for cotton. Background technique: [0002] Cotton is the seed fiber of the Malvaceae cotton plant, native to the subtropical zone. The plant is shrubby and can grow up to 6 meters high in tropical areas, generally 1 to 2 meters. The flowers are milky white, turn dark red shortly after flowering and then wither, leaving small green capsules called cotton bolls. There are cottonseeds in the cotton bolls, and the fluff on the cottonseeds grows from the skin of the cottonseeds and fills the inside of the cotton bolls. When the cotton bolls mature, they crack, exposing soft fibers. The fibers are white or white with yellow, about 2 to 4 cm (0.75 to 1.5 inches) long, containing about 87 to 90% cellulose, 5 to 8% water, and 4 to 6% other substances. The countries with the highest cotton production include China, the United St...

AI Technical Summary

Problems solved by technology

[0004] The growth and development of cotton requires water and nutrients, which are mainly obtained from the soil through the root system. If the fertilizer nutrients are released too quickly, the rate at which the roots absorb nutrients is greater than the rate at which nutrients are transmitted to the branches, resulting in over-developed roots and waste of fertilizers. , the well-developed root system is buried in the ground, which makes the removal process of the root system very cumbersome when the cotton is harvested and the land is used for other purposes, which has a great adverse effect on the reuse of the land