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A novel slow‐release nitrogen fertilizer with high‐water absorbency (SRNFWA) was prepared by cross‐linking poly (acrylic acid‐acrylic amide)/bentonite and urea. The synthesis conditions were studied systematically and optimized by using the response surface methodology (RSM). Meanwhile, the effects of the concentration of cross‐linker, initiator, bentonite, and degree of neutralization of acrylic...
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