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Simple phosphorus saturation index to estimate risk of dissolved P in runoff from arable soils
Author(s) -
Hughes S.,
Reynolds B.,
Bell S.A.,
Gardner C.
Publication year - 2000
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.2000.tb00194.x
Subject(s) - arable land , soil water , surface runoff , saturation (graph theory) , environmental science , phosphorus , soil science , hydrology (agriculture) , agronomy , environmental chemistry , chemistry , mathematics , geology , ecology , geotechnical engineering , agriculture , biology , organic chemistry , combinatorics
. There is increasing evidence that phosphorus has been accumulating in the surface horizons of agricultural soils to the extent that some soils represent a potential diffuse source of pollution to surface waters. The relationships between equilibrium phosphorus concentration at zero sorption (EPC 0 ) of soil and a number of soil physicochemical variables were investigated in the surface layers of arable and grassland agricultural soils sampled from the Thame catchment, England. Soil EPC 0 could be predicted from an equation including soil test (Olsen) P, soil phosphate sorption index (PSI) and organic matter content (OM) (R 2 =0.88; P <0.001) across a range of soil types and land use. The simple index Olsen P/PSI was found to be a good predictor of EPC 0 (R 2 =0.77; P <0.001) and readily desorbable (0.02 m KCl extractable) P (R 2 =0.73; P <0.001) across a range of soil types under arable having soil organic matter contents of <10%.