Pedosphere 8(3): 261--266, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Fractionation of moderately and highly stable organic phosphorus in acid soil |
| FAN Ye-Kuan and LI Shi-Jun |
| Department of Resources, Environment and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China) |
| ABSTRACT |
| The fractionation of moderately and highly organic phosphorus (Po) in acid soil was studied by two methods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable Po in the soil were determined. By the second method, five constituents of precipitates of stable Po in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable Po was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable Po was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable Po. |
| Key Words: fractionation, mineralization rate, soil, stable organic P |
| Citation: Fan, Y. K. and Li, S. J. 1998. Fractionation of moderately and highly stable organic phosphorus in acid soil. Pedosphere. 8(3): 261-266. |
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