Nitrogen controlling and phosphorus promoting type synergistic compound fertilizer and preparation method and application thereof
A technology for compound fertilizers and raw materials, applied in the application, nitrogen fertilizer, phosphate fertilizer and other directions, can solve the problems of not being able to control nitrogen and promote phosphorus at the same time, and the inability to increase efficiency of phosphorus, so as to facilitate mechanical operations and reduce fertilizer nitrogen and phosphorus leaching. and runoff losses, simplifying agricultural operations
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Embodiment 1
[0046] A preparation method of nitrogen-controlling phosphorus-promoting synergistic compound fertilizer, the steps are as follows:
[0047] (1) Preparation of urea hydrogel: add 10 g of acrylic acid polymer Carbopol 940 to 2000 g of water to form an aqueous solution, dissolve 2000 g of urea to form urea hydrogel for later use;
[0048] (2) Preparation of acid-modified bentonite: Disperse 1kg of 200-mesh bentonite in 20L of water, add 1L of nitric acid, stir at 90°C for 4h, wash until the supernatant is nearly neutral, dry at 105°C, grind finely, pass through a 200-mesh sieve, and set aside .
[0049] (3) 34 parts of granulated material heavy superphosphate, 25 parts of potassium chloride, 5 parts of acid-modified bentonite, 3 parts of trace elements (including ferrous sulfate heptahydrate, zinc sulfate heptahydrate, ammonium molybdate, boric acid) , The mass ratio of ferrous sulfate heptahydrate, zinc sulfate heptahydrate, ammonium molybdate and boric acid is 1:0.5:03:0.3. ...
Embodiment 2
[0052] A preparation method of nitrogen-controlling phosphorus-promoting synergistic compound fertilizer, the steps are as follows:
[0053] (1) Preparation of urea hydrogel: add 6 g of polyacrylamide to 2000 g of water to form an aqueous solution, dissolve 2000 g of urea to form urea hydrogel for later use;
[0054] (2) Preparation of organic acid modified bentonite: get 1 kg of bentonite after the inorganic acid activation of Example 1 and disperse it in 20L water, add 23g L in the bucket -1 Humic acid solution 866mL, after stirring for 30min, adjust the pH to 3, heat and stir at 60°C for 20h, centrifuge once, add water to wash once and centrifuge again, after centrifugation, dry at 60°C, grind finely, pass through a 200-mesh sieve, and set aside.
[0055] (3) 23 parts of superphosphate of granulated material, 17 parts of potassium chloride, 6 parts of acid-modified bentonite, 4 parts of trace elements (including ferrous sulfate heptahydrate, zinc sulfate heptahydrate, ammon...
Embodiment 3
[0058] A preparation method of nitrogen-controlling phosphorus-promoting synergistic compound fertilizer, the steps are as follows:
[0059] (1) Preparation of urea hydrogel: add 2 g of acrylic acid polymer Carbopol ETD2050 and 1.5 g of polyvinyl alcohol into 2000 g of water to form an aqueous solution, dissolve 2000 g of urea to form a urea hydrogel for later use;
[0060] (2) Preparation of inorganic acid-modified bentonite: Disperse 1kg of bentonite in 20L of water, add 1L of concentrated sulfuric acid, stir at 90°C for 4h, wash until the supernatant is nearly neutral, dry at 105°C, grind finely, pass through a 200-mesh sieve, and set aside .
[0061] Preparation of acid-modified zeolite: 1 kg of zeolite was mixed with 8 L of 0.1 mol / L hydrochloric acid, heated and stirred at 60°C for 3-4 hours, then filtered and washed for 3-5 times, and dried to obtain the modified zeolite.
[0062] (3) 18 parts of heavy superphosphate of the granulated material, 20 parts of potassium ch...
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