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Phosphorus Loss from an Agricultural Watershed as a Function of Storm Size

^a Dep. of Crop, Soil and Environmental Sciences, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR 72701
^b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702
^c Centre for Sustainable Water Management, Lancaster Environment Centre, Lancaster Univ., Lancaster, LA1 4YQ, UK
^d USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702. Mention of trade names does not imply endorsement by the U.S. Government

View larger version (48K): [in this window] [in a new window]   Fig. 1. The FD-36 watershed, field boundaries, and field identification numbers.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Relationship between storm-flow return period and mean dissolved phosphorus (DP), particulate phosphorus (PP), and total phosphorus P (TP) concentration for FD-36 during 1997 to 2006 (all regressions were significant at P > 0.05). For each form, concentration points assigned different letters were significantly different (P < 0.05) as determined by Tukey's studentized range test.