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Phosphorus Solubility in Response to Acidification of Dairy Manure Amended Soils

^a Dep. of Plant and Soil Science, Oklahoma State Univ., 367 Agricultural Hall, Stillwater, OK 74078-1020
^b USDA-ARS, Pasture System and Watershed Management Research Unit, 3702 Curtin Rd., State College, PA 16802

View larger version (18K): [in this window] [in a new window]   Fig. 1. Effect of soil pH and rate of pH adjustment on soil Mehlich 3-P (M3-P) concentrations for Sites 1 and 2 after 8-wk incubation. Single-point acidification = all acid added at incubation initiation; gradual acidification = acid applied in eight increments (one application per week).

View larger version (17K): [in this window] [in a new window]   Fig. 2. Effect of soil pH and rate of pH adjustment on soil water-soluble P (WSP) concentrations for Sites 1 and 2 after 8-wk incubation. Single-point acidification = all acid added at incubation initiation; gradual acidification = acid applied in eight increments (one application per week).

View larger version (19K): [in this window] [in a new window]   Fig. 3. Relationship between soil pH and water-soluble P (WSP) among soils gradually acidified compared with the same soils incubated for 2 more wk without receiving any additional acidification.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Relationship between soil pH and soil water-soluble P (WSP) concentrations for Sites 1 and 2 soils treated with a single-point acidification (all acid added at incubation initiation) and gradual acidification (acid applied in eight increments, one application per week) following 2 wk of additional incubation (10 wk total).