Pedosphere 1(3): 219--227, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Fate of N from Green Manures and Ammonium Sulfate |
| SHI SHU-LIAN, LIAO HAI-QIU, WEN QI-XIAO, XU XUE-QIAN, PAN ZUN-PU |
| Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 |
| ABSTRACT |
| By means of 15N tracer technique the fate of N in ammonium sulfate, milk vetch, sesbania and azolla, and the availability of their residual N were studied in a microplot experiment. Results showed that a) at the end of the first crop of early rice, both plant recovery and loss of N from ammonium sulfate were the highest whereas those from azolla were the lowest with those from milk vetch and sesbania in between; the sequence was reversed in terms of recovery of N in soil; the net residual N from ammonium sulfate was very low, about 1/7-1/4 of that from green manures, indicating that chemical N fertilizer contributes little to the soil N reserve; b) plant recovery of the residual N was low and it did not always decrease with time; the total plant recovery (from the second to the fifth crops) of the residual N from various test fertilizers was only 8-11 % of the total N originally applied. |
| Key Words: |
| Citation: Shi, S. L., Liao, H. Q., Wen, Q. X., Xu, X. Q. and Pan, Z. P. 1991. Fate of N from Green Manures and Ammonium Sulfate. Pedosphere. 1(3): 219-227. |
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