Abstract: Using acrylic acid，acrylamide，ammonia，urea，magnesium ammonium phosphate and sodium humate as the main raw materials，a slow-release urea with the function of water-absorption and water-retention was prepared. The synthesis conditions were optimized. The fertilizer contained 26.3% nitrogen and its water absorbency was 95 g/g in tap water. The properties of water-absorption and slow release were studied in soil，and the fertilizer’s coatings were characterized with SEM. The results showed that the largest water-holding ratio of soil with 1% of the fertilizer was 14.3%，and the water evaporation rate also decreased obviously. The released nutrients were below 80% after one month.

摘要： 以丙烯酸、丙烯酰胺、氨水、尿素、磷酸镁铵和腐殖酸钠等为主要原料，制备了一种既具有缓释性又可吸水保水的双层包膜尿素。对其制备条件进行了优化，得产品含氮量为26.3%，常压下吸自来水95倍；研究了产品在土壤中的吸水保水性和缓释性，推测了其释放过程机理；并通过扫描电镜检测了包膜尿素和膜层的形貌特征。结果表明：试验土壤中加入1%本产品，最大持水率提高14.3%，水分蒸发率明显降低，土壤具有很好的吸水保水性能，养分释放率在一个月内不超过80%。