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
A double-coated, slow-release fertilizer technology, applied in the direction of layered/coated fertilizers, potash fertilizers, nitrogen fertilizers, etc., can solve the complex production process of controlled-release materials, large-scale application restrictions, high prices of controlled-release fertilizers, etc. problems, to achieve the effect of improving long-term sustained-release performance, improving water absorption and water retention, reducing volatilization and leaching loss
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[0024] A double-coated water-retaining slow-release fertilizer capable of releasing negative ions, consisting of the following raw materials in parts by weight: urea 65, ammonium phosphate 25, acrylic acid 33, wheat straw 20, distilled water, potassium hydroxide 5, sodium borohydride 1, Humic acid 14, anhydrous sodium sulfite 9, formaldehyde solution 7, ammonium persulfate 6, N,N'-methylenebisacrylamide 2, sodium alginate 13, 5% calcium chloride aqueous solution, paraffin 3, tourmaline powder 7 , Inorganic clay 3, nano negative ion powder 3, Korean pine polyphenol 2, 10% sodium hydroxide solution in proper amount.
[0025] Specific steps are as follows:
[0026] (1) Straw pretreatment:
[0027] Crush the wheat straw, add distilled water with a mass ratio of 60 times the wheat straw, place the suspension in a water bath at 65°C, filter after 16 hours, add the filtrate to an aqueous solution containing potassium hydroxide and sodium borohydride, Under mechanical stirring for 3...
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