A kind of preparation method of multifunctional composite water-retaining slow-release fertilizer
A slow-release fertilizer and multi-functional technology, applied in the direction of urea compound fertilizer, organic fertilizer, ammonium salt fertilizer, etc., can solve the problems of refractory degradation, high fertilizer cost, inconsistent fertilizer release speed and crop growth needs
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Embodiment 1
[0026] Add 5.0mL of 1% carboxymethylcellulose solution to the beaker, then add urea 2.000g, acrylamide 1.792g, maleic anhydride modified cyclodextrin 0.208g, N,N-methylenebisacrylamide 0.043 g, 1.0mL of ammonium persulfate solution, 1.0mL of vitamin C solution, after fully mixing, raise the temperature to 60°C, and react for 0.1 hour to obtain a water-retaining slow-release fertilizer, whose swelling and slow-release curves are as follows figure 1 shown.
Embodiment 2
[0028] Add 5.0 mL of 1% carboxymethylcellulose solution to the beaker, then add 2.000 g of urea, 1.792 g of acrylamide, 0.208 g of modified cyclodextrin, and 1.200 g of halloysite loaded with urea (12.7% urea loading), N,N-methylenebisacrylamide 0.043g, ammonium persulfate solution 1.0mL, vitamin C solution 1mL, mix well, raise the temperature to 60°C, and react for 0.2 hours. Water-retaining slow-release fertilizer is obtained, and its swelling and slow-release curves are as follows: figure 2 shown.
Embodiment 3
[0030] 5.0mL of 1% carboxymethylcellulose solution in a beaker, then add 2.50g of urea, 0.896g of acrylamide, 1.000g of acrylic acid, 0.104g of modified cyclodextrin, 0.570g of halloysite loaded with urea (urea loading capacity 12.7 %), N, N-methylenebisacrylamide 0.0273g, ammonium persulfate solution 1.0mL, vitamin C solution 1.0mL, mix well, raise the temperature to 60°C, and react for 0.2 hours. Water-retaining slow-release fertilizer is obtained, and its swelling and slow-release curves are as follows: image 3 shown.
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