Pedosphere 1(3): 241--251, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Direct Estimation of Nitrogen Gases Emitted from Flooded Soils During Denitrification of Applied Nitrogen |
| CAI GUI-XIN, CAO YA- CHEN, YANG NAN-CHANG, LU YA-HAI, ZHUANG LIAN-JUAN, WANG XIAN-ZHONG, ZHU ZHAO-LIANG |
| Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 21000S |
| ABSTRACT |
| Denitrification losses measured by direct method (measuring the evolution of (N2+N2O)-15N) were compared with the apparent denitrification losses (calculated from the difference between the total N loss and ammonia loss), for fertilizers applied to flooded soils. The direct measured denitrification losses from potassium nitrate were 23.0%, 40.0%, and 63.1-79.7% of applied N in rice field, and in incubations of 7 cm deep layer of soil and 2 cm deep layer of soil, respectively; while the corresponding apparent denitrification losses were 96.0%, 98.4%, and 97.7-97.9%, respectively. In field experiments with urea, the direct measured denitrification losses ranged from 0.1-1.8%, which were much less than the apparent denitrification losses (41.3-45.7%). |
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| Citation: Cai, G. X., CAO YA- CHEN, Yang, N. C., Lu, Y. H., Zhuang, L. J., Wang, X. Z. and Zhu, Z. L. 1991. Direct Estimation of Nitrogen Gases Emitted from Flooded Soils During Denitrification of Applied Nitrogen. Pedosphere. 1(3): 241-251. |
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