Pedosphere 8(1): 45--52, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Gaseous loss of nitrogen from fertilizers applied to wheat on a calcareous soil in North China Plain |
| CAI Gui-Xin1, FAN Xiao-Hui1, YANG Zhen2 and ZHU Zhao-Liang1 |
1 Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China);
2 Nanjing University of Science and Technology, Nanjing 210014 (China) |
| ABSTRACT |
| 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. |
| Key Words: ammonia volatilization, denitrification loss, nitrogen fertilizer, wheat |
| Citation: Cai, G. X., Fan, X. H., Yang, Z. and Zhu, Z. L. 1998. Gaseous loss of nitrogen from fertilizers applied to wheat on a calcareous soil in North China Plain. Pedosphere. 8(1): 45-52. |
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