Double-layer coated slow-release nitrogen fertilizer for improving saline-alkali soil and preparation method thereof

Abstract

The invention discloses a double-layer coated slow-release nitrogen fertilizer for improving saline-alkali soil. The nitrogen fertilizer is composed of the following raw materials in parts by weight: 55-70 parts of urea, 22-30 parts of ammonium phosphate, 35-50 parts of acrylic acid, 15-25 parts of wheat straw, a right amount of distilled water, 2-7 parts of potassium hydroxide, 0.5-2 parts of sodium borohydride, 10-16 parts of humic acid, 8-12 parts of anhydrous sodium sulfite, 5-9 parts of formaldehyde solution, 3-7 parts of ammonium persulfate, 1-3 parts of N,N'-methylenebisacrylamide, 9-16 parts of sodium alginate, a right amount of 5% calcium chloride water solution, 2-4 parts of paraffin, 2-4 parts of furfural residue, 4-10 parts of attapulgite clay, 2-5 parts of dilute sulfuric acid and a right amount of sodium hydroxide solution. According to the invention, the humic acid is modified to enhance the water solubility, and the urea fertilizer effect and the nitrogen utilization ratio are increased, thereby improving the water absorption property, water retention property and salt tolerance of the slow-release fertilizer.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a double-coated slow-release nitrogen fertilizer for improving saline-alkali land 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 0.5% of the wo...

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