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Amounts, Forms, and Solubility of Phosphorus in Soils Receiving Manure

^a USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Rd., University Park, PA 16802-3702
^b AgResearch Ltd., Invermay Agricultural Research Centre, Private Bag 50034, Mosgiel, New Zealand

View larger version (20K): [in a new window]   Fig. 1. Relationship between water and Mehlich-3 extractable soil P for untreated and manured soils from New York, Oklahoma, and Pennsylvania.

View larger version (25K): [in a new window]   Fig. 2. Relationship between the percentage of Mehlich-3 P as water-extractable soil P and Mehlich-3 P for untreated and manured soils from New York, Oklahoma, and Pennsylvania. The arrow indicates the threshold value.

View larger version (23K): [in a new window]   Fig. 3. Relationship between water- and Mehlich-3 extractable soil P for untreated and manured soils from New York, Oklahoma, and Pennsylvania with Mehlich-3 P less than 400 mg kg–1. The arrow indicates the threshold value.

View larger version (19K): [in a new window]   Fig. 4. Relationship between the percentage of Mehlich-3 as water-extractable soil P and exchangeable Ca for untreated and manured soils from New York, Oklahoma, and Pennsylvania.

View larger version (17K): [in a new window]   Fig. 5. Relationship between the acid extractable inorganic P difference in untreated and manured soils and exchangeable Ca difference in untreated and manured soils.

View larger version (29K): [in a new window]   Fig. 6. Calcium phosphate double function plot of solubilities for untreated and manured surface soil (0- to 5-cm depth) in relation to dicalcium phosphate dihydrate, DCPD; octocalcium phosphate, OCP; tricalcium phosphate, TCP; and hydroxyapatite, HA.