Double-layered coated water-retention slow-released fertilizer capable of releasing negative ions and preparation method of double-layered coated water-retention slow-released fertilizer

Abstract

The invention discloses double-layered coated water-retention slow-released fertilizer capable of releasing negative ions. The double-layered coated water-retention slow-released fertilizer is prepared from the following raw materials in parts by weight: 55 to 70 parts of urea, 20 to 30 parts of ammonium phosphate, 30 to 40 parts of acrylic acid, 14 to 25 parts of wheat straw, a proper amount of distilled water, 2 to 7 parts of potassium hydroxide, 0.5 to 2 parts of sodium borohydride, 12 to 16 parts of humic acid, 5 to 10 parts of anhydrous sodium sulfite, 5 to 10 parts of a formaldehyde solution, 3 to 7 parts of ammonium persulfate, 1 to 3 parts of N,N'-methylene-bisacrylamide, 10 to 16 parts of sodium alginate, a proper amount of a 5 percent calcium chloride water solution, 2 to 4 parts of paraffin wax, 4 to 8 parts of tourmaline powder, 2 to 5 parts of inorganic clay, 2 to 4 parts of nano negative ion powder, 1 to 3 parts of red pine polyphenol and a proper amount of a 10 percent sodium hydroxide solution. According to the double-layered coated water-retention slow-released fertilizer, the humic acid is subjected to modification treatment so that the water solubility is improved; the fertilizer effect of the urea and the utilization rate of nitrogen are improved; the water absorption and water retention properties, and salt resistance of the slow-released fertilizer are improved.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a double-layer coated water-retaining slow-release fertilizer capable of releasing negative ions and a preparation method thereof. Background technique [0002] Slow release fertilizer refers to a new type of fertilizer that can slow down or control the release rate of nutrients. Slow-release fertilizers have low solubility in water, and the nutrients are released slowly in the soil, reducing the loss of nutrients; the fertilizer effect is long-term and stable, and the energy can continuously supply the nutrient needs of plants throughout the growth period; suitable for different types of soil and plants , effectively prevent soil compaction. Although slow-release and controlled-release fertilizers have good potential economic and social benefits and have been commercialized, their large-scale application in agriculture is still limited, accounting for less than...

AI Technical Summary

Problems solved by technology

Although slow-release and controlled-release fertilizers have good potential economic and social benefits and have been commercialized, their large-scale application in agriculture is still limited, accounting for less than 0.5% of the world's total fertilizer consumption. The production process is complex, resulting in high prices for controlled-release fertilizers