中文摘要：

应用密闭法对尿素及其二次加工产品一复合肥料、包膜尿素和包膜复合肥料在施入土壤后的氨挥发特征进行了研究。结果表明，尿素二次加工产品的氨挥发损失特征各不相同：尿素、复合肥料、包膜尿素、包膜复合肥的氨挥发分别占总施氮量的9．2％、10．4％、7．6％、9．3％；复合肥料氨挥发损失比尿素高12．9％，而包膜尿素的氨挥发损失较尿素低17．9％。包膜复合肥与尿素相比，二者氨挥发总体上接近，但在施肥后前25d包膜复合肥降低氨挥发15．6％，降雨后25d却增加氨挥发20．7％。尿素二次加工产品的氨挥发损失特征需结合其生产工艺进行进一步研究。

英文摘要：

Studies on the characteristic of ammonia volatilization in soil surface applied urea, compound fertilizer, coated urea and coated compound fertilizer by the enclosure method. The results indicated that ammonia volatilization characteristic of secondary processing urea were different： （1） 9.2%, 10.4%, 7.6%, 9.3% of total applied N were volatilized when urea, compound fertilizer, coated urea and coated compound fertilizer were applied. （2） The amount of ammonia volatilization of compound fertilizer was 12.9 % higher than that of urea. （3） Coated urea ammonia volatilization was 17.9 % lower than urea. （4） The amount ammonia volatilization of compound fertilizer were close to than that of urea. Though coated compound fertilizer ammonia volatilization was 15.6% lower than that of urea in the 25 day after surface applied, 20.7% higher than of urea in the last 25 day. （5） The ammonia volatilization characteristic of secondary processing urea was need further studies with its production process.