Modified humic acid-straw bio-organic fertilizer for improving soil geology

Abstract

The application belongs to the technical field of organic fertilizer preparation and relates to a modified humic acid-straw bio-organic fertilizer for improving soil geology. The method comprises the following steps: after humic acid and fulvic acid are enzymolyzed by a composite enzyme preparation and chelated with zinc and molybdenum ions, a high-activity humic acid-zinc and molybdenum chelate is prepared; after plant straw is pyrolyzed under low temperature and limited oxygen and treated with dilute alkali, straw slurry is obtained; diatomite, bentonite and other mineral materials and a functional bacterial agent are fermented to prepare a bio-mineral composite base material; the three types of materials are mixed in proportion, and after being subjected to segmented temperature control fermentation and aging, a composite adhesive and the functional bacterial agent are added, granulation, standing and drying are carried out to obtain a finished product. Through material modification and process coupling, the activity of humic acid and the straw degradation efficiency are significantly improved, the bio-mineral carrier and the post-bacterial addition technology are combined to ensure a high survival rate of functional microorganisms, and the gel slow-release system is used to enhance the stability and long-acting property of the product.

Claims

1. A method for preparing modified humic acid-straw bio-organic fertilizer to improve soil geology, characterized in that, Includes the following steps: Step 1: Mix humic acid and fulvic acid and adjust the water content to 50-60%. Then add a compound enzyme preparation and enzymatically hydrolyze at 40-50℃ for 5-7 hours. Then add zinc sulfate-ammonium molybdate aqueous solution to obtain humic acid-zinc molybdenum chelate. The mass ratio of weathered coal humic acid, biochemical fulvic acid, compound enzyme preparation and zinc sulfate-ammonium molybdate aqueous solution is (8-12):(4-6):(0.2-0.25):(30-40); Step 2: Crush the plant straw, pyrolyze it at 280-320℃ with an oxygen concentration ≤5%, and immediately soak it in potassium hydroxide solution after pyrolysis to obtain straw slurry; Step 3: Mix and crush diatomaceous earth, bentonite, zeolite and vermiculite, sieve, adjust the moisture content to 40-50% with brown sugar solution, then inoculate with functional compound microbial agent, ferment at 30-40℃ for 36-72 hours to obtain biological-mineral composite substrate; The mass ratio of diatomaceous earth, bentonite, zeolite, vermiculite and functional compound microbial agent is (40-50):(10-20):(10-20):(15-25):(4-6); Step 4: Mix humic acid-zinc-molybdenum chelate, straw slurry, and bio-mineral composite substrate at a mass ratio of (1-3):(3-5):(2-4), and adjust the moisture content to 50-60% with diammonium hydrogen phosphate solution, and adjust the carbon-nitrogen ratio to (20-25):

1. Ferment at 40-65℃ for 22-30 days, and at 40-50℃ for 15-20 days, turning the pile every 3-4 days. After fermentation, let it stand for 10-15 days, spread the material evenly, add binder and functional compound microbial agent, adjust the moisture content to 18-22%, granulate, stand at 35-40℃ and ≥80%RH for 5-7 days, and dry to a moisture content ≤12% to obtain the finished modified humic acid-straw bio-organic fertilizer. The mass ratio of the material, binder and functional compound microbial agent is 100:(8-12):(0.5-1).

2. The method for preparing modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, The compound enzyme preparation mentioned in step one includes laccase, lignin peroxidase and manganese peroxidase, in a mass ratio of (2-4):(1-3):(2-4).

3. The method for preparing a modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, In step one, the zinc sulfate-ammonium molybdate aqueous solution has a zinc sulfate concentration of 8-12% and an ammonium molybdate concentration of 0.8-1.2%.

4. The method for preparing a modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, The mass ratio of plant straw to potassium hydroxide solution in step two is 1:(1-2).

5. A method for preparing modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1 or 4, characterized in that, The mass concentration of the potassium hydroxide solution is 1-3%.

6. The method for preparing a modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, The mass concentration of the brown sugar solution mentioned in step three is 4-6%.

7. The method for preparing modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, The adhesive mentioned in step four includes starch adhesive, sodium alginate and potassium humate, in a mass ratio of (5-8):(3-5):(2-4).

8. The method for preparing a modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, The functional compound microbial agent described in steps three and four is based on water and includes ≥2×10 9 Bacillus subtilis CFU / mL, ≥1.5×10 9 CFU / mL of gelatinous Bacillus and ≥1×10 9 Yeast at CFU / mL.

9. The method for preparing a modified humic acid-straw bio-organic fertilizer for improving soil geology according to claim 1, characterized in that, In step four, ferment at 55-65℃ for 7-10 days, or at 40-50℃ for 15-20 days.

10. Modified humic acid-straw bio-organic fertilizer prepared by the method according to any one of claims 1-9.

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