Sharpley, A. and Gburek, W. and Heathwaite, A. Louise (1998) Agricultural phosphorus and water quality:sources, transport and management. Agricultural and Food Science in Finland, 7 (2). pp. 297-314. ISSN 1795-1895Full text not available from this repository.
Freshwater eutrophication is usually controlled by inputs of phosphorus (P). To identify critical sources of P export from agricultural catchments we investigated hydrological and chemical factors controlling P export from a mixed land use (30% wooded, 50% cultivated, 20% pasture) 39.5-ha catchment in east-central Pennsylvania, USA. Mehlich-3 extractable soil P, determined on a 30-m grid over the catchment, ranged from 7 to 788 mg kg-1. Generally, soils in wooded areas had low Mehlich-3 P (<30 mg kg-1), grazed pasture had Mehlich-3 P values between 100 and 200 mg kg-1, and cropped fields receiving manure and fertiliser applications were in most cases above 200 mg kg-1. Average P concentrations for ten storms during 1996 decreased 50% downstream from segment 4 to segment 1 (catchment outlet). Flow-weighted streamflow P concentrations were more closely related to the near-stream (within 60 m) than whole catchment distribution of high-P soils. This suggests that near-stream surface runoff and soil P are controlling P export from the catchment. Remedial measures should be targeted to these critical P source areas in a catchment. Measures include source (fertiliser and manure application) and transport management (reduce surface runoff and erosion).
|Journal or Publication Title:||Agricultural and Food Science in Finland|
|Additional Information:||Agricultural phosphorus and water quality: sources, transport and management 19 cites: http://scholar.google.com/scholar?num=100&hl=en&lr=&cites=18127540156840397455|
|Departments:||Faculty of Science and Technology > Lancaster Environment Centre|
|Deposited On:||16 Sep 2011 11:14|
|Last Modified:||24 Jun 2016 01:36|
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