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Fig. 4. Ranking, for each soil P test and sample date, of the relative P extractability (RPE) values for the 28 organic P sources. Bars in (a) to (f) are arranged in ascending order based on the RPE value for the soil P test and sample date. Dashed line in each graph represents the RPE value for the KH2PO4 source (100%). Error bars signify standard deviation of the means within source category. BL, broiler litter; BLA, broiler litter with alum; BP, Blue Plains; BR, Back River; LP, Little Patuxent; DBC, dairy/beef compost; DBL, dairy/beef liquid; DBS, dairy/beef solid; PDP, poultry—deep pit; SF, swine—fresh; SL, swine—liquid.
