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Phosphorus Transport in Overland Flow in Response to Position of Manure Application

^a AgResearch LtD, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand
^b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702

View larger version (11K): [in a new window]   Fig. 1. Relative manure application to each soil box (to scale). Downslope is at the right-hand end for each box.

View larger version (27K): [in a new window]   Fig. 2. Variation of P fractions with time for untreated Berks high P and Watson low P soils. Lines represent the fit of the power equation to the data. No line represents a nonsignificant fit. Vertical bars represent the percent clay in each sediment sample. DRP, dissolved reactive phosphorus; DURP, dissolved unreactive phosphorus; TDP, total dissolved reactive phosphorus; PP, particulate phosphorus; TP, total phosphorus.

View larger version (25K): [in a new window]   Fig. 3. Variation of P fractions with flowpath length for treated Berks high P and Watson low P soils. Lines represent the fit of the power equation to the data. No line represents a nonsignificant fit. DRP, dissolved reactive phosphorus; DURP, dissolved unreactive phosphorus; TDP, total dissolved reactive phosphorus; PP, particulate phosphorus; TP, total phosphorus.

View larger version (25K): [in a new window]   Fig. 4. Variation of P fractions with flowpath length for the difference between manured and untreated Berks high P and Watson low P soils. Lines represent the fit of the power equation to the data. DRP, dissolved reactive phosphorus; DURP, dissolved unreactive phosphorus; TDP, total dissolved reactive phosphorus; PP, particulate phosphorus; TP, total phosphorus.

View larger version (83K): [in a new window]   Fig. 5. Soil types (Berks [Typic Dystrudept] and Watson [Typic Fragiudult]), segments (#1–4), and distance from the stream channel within the watershed FD-36.

View larger version (29K): [in a new window]   Fig. 6. Saturated distance from stream in each of the four segments (Fig. 5) within the FD-36 watershed for storms producing overland flow from October 1996 to December 1999 (n = 110). Dotted line represents minimum distance from the stream for total phosphorus (TP) concentrations < 0.1 mg L-1 for Berks low P soil (...) and Watson low P soil (------).