Fig. 5. Overall relative P extractability (RPE) ranking, based on the average value of all RPE for each soil test and sample date, for the 11 types of organic P sources evaluated in the incubation study. 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.