Pedosphere 2(2): 171--178, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Losses of Urea-Nitrogen Applied to Maize Grown on a Calcareous Fluvo-Aquic Soil in North China Plain |
| ZHANG SHAO-LIN1, CAI GUI-XIN1, WANG XIAN-ZHONG1, XU YIN-HUA1, ZHU ZHAO-LIANG1, J. R. FRENEY2 |
| 1.Institute of Soil Science, Academia Sinica, Nanjing 2100082.Laboratory of Material Cycling in Pedosphere, Academia Sinica, Nanjing 21000S (China)Division of Plant Industry, CSIRO, Canberra |
| ABSTRACT |
| Field experiments were conducted in a maize (Zea mays L.) field of a calcareous fluvo-aquic soil in North China Plain for studying the fate and ammonia loss of urea-N applied at seedling stage, as well as the effectiveness of coated calcium carbide (CCC) in reducing N loss and in improving the yield efficiency of urea. Results show that: (1) For the surface-broadcast treatment ammonia volatilization (measured with micro-meteorological technique) took place quickly, reached the peak 20-26 hr after application, and then declined gradually; the cumulative ammonia loss approached the maximum 188 hr after application (30% of the N applied), and increased only to 32% 284 hr after application; the latter accounted for 71 % of the total loss (45% of applied N). |
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| Citation: Zhang, S. L., Cai, G. X., Wang, X. Z., Xu, Y. H., Zhu, Z. L. and Freney, J. R. 1992. Losses of Urea-Nitrogen Applied to Maize Grown on a Calcareous Fluvo-Aquic Soil in North China Plain. Pedosphere. 2(2): 171-178. |
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