P Fractions in Drainage Waters from the Broadbalk Continuous Wheat Experiment at RothamstedEnglish Full Text
LU Jia-Long, S. FORTUNE and P. BROOKES State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Sci-Tech University of Agricul-ture and Forestry, Yangling, Shaanxi 712100 (China). E-mail: jialongluw@yahoo.com.cn 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.
- Series：
(D) Agriculture
- Subject：
Crop
- Classification Code：
S512.1
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