Gaseous Loss of Nitrogen from Fertilizers Applied to Wheat on a Calcareous Soil in North China Plain

查看全文 作　　者：[1]CAIGUIXIN;[2]YANGZHEN;等 机构地区：[1]InstituteofSoilScience,theChineseAcademyofSciences,Nanjing210008(CHina);[2]NanjingUniversityofScienceand 出　　处：《Pedosphere》索引1998年第8卷第1期,共8页 摘　　要：Nitrogen (N) losses from ammonium bicarbonate or urea applied to wheat and then followed immediately by irrigation were investigated. Ammonia volatilization was determined by a micrometeorological method (ammonia sampler), total N loss was estimated by the 15N mass balance method, and denitrification loss was measured by the difference method (calculated from the difference between the total N loss and ammonia loss)and a direct method (measuring the emission of (N2+N2O)-15N ). Total ammonia losses from ammonium bicarbonate and urea in 33 days were 8.7% and 0.9% of the applied nitrogen, respectively. The corresponding total N losses were 21.6% and 29.5%. Apparent denitrification losses (by the difference method) were rather high, being 12.9% from ammonium bicarbonate and 28.6% from urea. However, no emission of (N2+N2O)-15N was detected using the direct method. 关 键 词：氨挥发 脱氮作用 氮肥 小麦 华北地区 气态 氮流失 钙土