新型包膜尿素的氮释放动态研究

利用高分子聚合物为包膜材料，根据涂膜量不等制得CU1， CU2二种包膜尿素，并在实验室条件下对其进行性能测试，以常规尿素（U）作比较，验证包膜尿素（CU）作为新型高效肥料的优点。研究结果表明：包膜尿素CU系列均具有不同程度的缓效性，涂膜量越大，养分溶出速率越慢； 包膜尿素CU系列在各种土壤中的淋失量和挥发量均少于常规尿素； 环境中离子浓度高低影响包膜尿素的溶出动态。

Studies on nitrogen release dynamics of new coated ureas.

Coated ureas(CUs:CU1, CU2) were made of normal granular urea by coating with organic polymer layers in different thickness the nitrogen release rate of CUs were determined in lab under different conditions,The results obtained showed that: Coated ureas were all slow release fertilizers The thicker the polymer layer was, the slower its nutrient released; The ammonia volatilization and nitrogen leachate reduced from CUs compared with normal urea; The content of ions in the environment affected the release rate of nitrogen of CUs