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The effect of soil phosphorus on particulate phosphorus in land runoff


The effect of soil phosphorus on particulate phosphorus in land runoff



European Journal of Soil Science 60.6



ISSN/ISBN: 1351-0754

DOI: 10.1111/j.1365-2389.2009.01161.x

Accumulation of surplus phosphorus (P) in the soil and the resulting increased transport of P in land runoff contribute to freshwater eutrophication. The effects of increasing soil P (19-194 mg Olsen-P (OP) kg(-1) ) on the concentrations of particulate P (PP), and sorption properties (Q(max) , k and EPCo) of suspended solids (SS) in overland flow from 15 unreplicated field plots established on a dispersive arable soil were measured over three monitoring periods under natural rainfall. Concentrations of PP in plot runoff increased linearly at a rate of 2.6 mu g litre(-1) per mg OP kg(-1) of soil, but this rate was approximately 50% of the rate of increase in dissolved P ( 0.05) effect on the P(sat) , or EPCo, of the SS. Management options to reduce soil P status as a means of reducing P losses in land runoff and minimizing eutrophication risk may therefore have more limited effect than is currently assumed in catchment management. Abstract Copyright (2009), British Society of Soil Science.

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Accession: 037178918

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