Slow-release type compound fertilizer for improving saline-alkali land and preparation method thereof
A compound fertilizer and slow-release technology, applied in the direction of organic fertilizer, excretion fertilizer, fertilizer mixture, etc., can solve the problems of high hygroscopicity, poor effect of improving soil structure of water retention performance in saline-alkali land, difficult storage, etc., and achieve gel ability Strong, reduce water loss, improve the effect of water retention capacity
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Embodiment 1
[0033] A slow-release compound fertilizer for improving saline-alkali land, in parts by weight, comprising the following components:
[0034] 20 parts of humic acid, 15 parts of human and livestock manure, 10 parts of corn stalks, 6 parts of soybean meal, 5 parts of rice bran, 10 parts of fermentation liquid, 4 parts of microbial agent, and 10 parts of coating material;
[0035] The coating material is a composite gel formed by polyacrylic acid, silica gel, sodium alginate and chitosan; the mass ratio of polyacrylic acid, silica gel, sodium alginate and chitosan is 3:3: 2:10;
[0036]The fermentation liquid is a mixed aqueous solution of Lactobacillus acidophilus, Bacillus subtilis and Bacillus licheniformis, the mass concentration of Lactobacillus acidophilus in the mixed aqueous solution is 15%, the mass concentration of Bacillus subtilis is 8%, and the mass concentration of Bacillus licheniformis The mass concentration of bacilli was 10%.
Embodiment 2
[0038] In parts by weight of Example 1:
[0039] (1) Sodium alginate (the number average molecular weight is 35775, the ratio of number average molecular weight and weight average molecular weight is 1.392, food grade, Qingdao Mingyue Seaweed Group Co., Ltd.) is dissolved in deionized water to obtain a mass concentration of 5%. Sodium alginate aqueous solution; Chitosan (deacetylation degree 95%, Shandong Aokang Biotechnology Co., Ltd.) is dissolved in the acetic acid aqueous solution that concentration is 2wt%, and the obtained mass concentration is 5% chitosan acetic acid solution;
[0040] (2) Mix sodium alginate aqueous solution and chitosan acetic acid solution evenly, and add dropwise a calcium chloride solution whose mass concentration is 25%, the mass ratio of sodium alginate and calcium chloride is 0.85:1; Combined reaction for 1h to prepare sodium alginate / chitosan composite gel;
[0041] (3) Dissolve 1 mL of tetraethyl orthosilicate in 10 mL of absolute ethanol, th...
Embodiment 3
[0045] A slow-release compound fertilizer for improving saline-alkali land, in parts by weight, comprising the following components:
[0046] 30 parts of humic acid, 22 parts of human and livestock manure, 15 parts of corn stalks, 11 parts of soybean meal, 8 parts of rice bran, 15 parts of fermentation broth, 9 parts of microbial agent, 20 parts of coating material;
[0047] The coating material is a composite gel formed by polyacrylic acid, silica gel, sodium alginate and chitosan; the mass ratio of polyacrylic acid, silica gel, sodium alginate and chitosan is 7:3: 4:13;
[0048] The fermentation liquid is a mixed aqueous solution of Lactobacillus acidophilus, Bacillus subtilis and Bacillus licheniformis, the mass concentration of Lactobacillus acidophilus in the mixed aqueous solution is 20%, the mass concentration of Bacillus subtilis is 13%, and the mass concentration of Bacillus licheniformis The mass concentration of bacilli was 12%.
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