Fractionation of Moderately and Highly Stable Organic Phosphorus in Acid Soil *1English Full Text

FAN YEKUAN and LI SHIJUN Department of Resources, Environment and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China) (Received February 28, 1998; revised April 29, 1998)

Abstract: The fractionation of moderately and highly organic phosphorus （P o） in acid soil was studied by two me thods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable P o in the soil were determined. By the second method, five constituents of precipitates of stable P o 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 P o was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable P o was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable P o.

Keywords：

fractionation; mineralization rate; soil; stable organic P;

Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
Subject：
Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy
Classification Code：
S153.62,S151.93

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Fractionation of Moderately and Highly Stable Organic Phosphorus in Acid Soil *1English Full Text

FAN YEKUAN and LI SHIJUN Department of Resources, Environment and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China) (Received February 28, 1998; revised April 29, 1998)

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