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The Effects of Soil Carbon on Phosphorus and Sediment Loss from Soil Trays by Overland Flow

R. W. McDowell*,a and A. N. Sharpleyb

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



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Fig. 1. Relationship between mean soil labile carbohydrate and the mean total load of sediment lost.

 


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Fig. 2. Variation of the mean of P fractions for poultry-manured soils (50 kg P ha-1) with time since the onset of flow.

 


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Fig. 3. Variation of the ß parameter (nonsignificant parameters excluded) for the power function fit of mean dissolved reactive phosphorus (DRP; top) and total phosphorus (TP; bottom) concentration with time against mean labile carbohydrate.

 


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Fig. 4. Variation of the mean percentage decrease of total phosphorus (TP) with time since the onset of flow.

 





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Vadose Zone Journal
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