Fig. 1. Comparison of the forms and distribution of soil P in the profiles of cropped and forested soils from four poultry farms in southern Delaware. (a) Changes in Mehlich 3 P with depth in the soil profile; (b) Changes in degree of P saturation by the oxalate method (DPS_ox) in the soil profiles; (c) Relationships between Mehlich 3 P in topsoils and DPS_Profile and water soluble P (WSP) at the 60- to 90-cm soil depth.

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