One humic acid/amylum/polyacrylic acid resin, applied to slow release fertilizer, was prepared from humic acid, amylum, acrylic acid by the method of copolymerization and cross-linking. The optimal mass ratio of humic acid,amylum,acrylic acid and N, N-methylenebisacrylamide was 8:20:72,and the max water absorption amount was 659 g/g for deionized water and 425 g/g for tap water. The results showed that slow-release time of urea was 60~70 day, meeting the technological standards of GB/T23348-2009.%采用水溶液聚合法,以N,N-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,通过添加腐植酸,淀粉与丙烯酸共聚交联,制备了一种高吸水缓释肥材料.腐植酸、淀粉和丙烯酸的最佳质量配比为8∶20∶72.此时,材料具有最大吸水率:659 g/g(去离子水)、425 g/g(自来水).尿素缓释肥的缓释周期为60d,符合GB/T23348-2009规定的缓释效果.
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