Pedosphere 14(2): 235--240, 2004
ISSN 1002-0160/CN 32-1315/P
©2004 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| P fractions in drainage waters from the broadbalk continuous wheat experiment at rothamsted |
LÜ Jia-Long 1, S. FORTUNE2 and P. BROOKES2 |
1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi 712100 (China). E-mail: jialongluw@yahoo.com.cn;
2 Rothamsted Research, Harpenden, Herts AL5 2JQ (UK) |
| ABSTRACT |
| Total P (TP), total participate P (PP), total dissolved P (TDP), molybdate reactive P (MRP) and dissolved organic P (DOP) were determined in waters from pipe-drains (at 65-cm depth) from the Broadbalk Experiment at Rothamsted Research, UK. Average TP and PP exceeded 1 mg L-1 in about half of the 12 plots receiving superphosphate for the 5 measurements taken between December 2000 and April 2001. Ranging between 33.8% and 87.3% of TP, PP was the largest P fraction in drainage waters, with DOP, ranging from 0.5% to 26.2% of TP, being the smallest fraction. Mean proportions of PP, MRP and DOP in TP in drainage waters were 63.4%, 32.5% and 4.1%, respectively. These findings support previous findings that P losses from soil to drainage waters were much larger than previously thought, and could therefore make a significant contribution to eutrophication. |
| Key Words: Broadbalk experiment, drainage waters, phosphorus leaching |
| Citation: LÜ Jia-Long, Fortune, S. and Brookes, P. 2004. P fractions in drainage waters from the broadbalk continuous wheat experiment at rothamsted. Pedosphere. 14(2): 235-240. |
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