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Ligands and Phytase Hydrolysis of Organic Phosphorus in Soils Amended with Dairy Manure

USDA-ARS, AMBL, BARC-East, Beltsville, MD 20705-2350

View larger version (20K): [in a new window]   Fig. 1. (A) Retention of orthophosphate and (B) myo-inositol 1, 2, 3, 5/4, 6-hexakis dihydrogenphosphate on two ion sink materials as described by the Langmuir sorption model. Error bars represent standard deviation (n = 6).

View larger version (20K): [in a new window]   Fig. 2. Effects of zerovalent aluminum–copper alloy (ZVMA), organic ligands, and ZVMA-ligand combinations on desorption of inorganic complexed P in a Unicorn sandy loam and Christiana silt loam. Error bars represent standard deviation (n = 12).

View larger version (27K): [in a new window]   Fig. 3. Extractability of inorganic complexed P as affected by concentrations of organic ligands in Unicorn and Christiana soils. Error bars represent standard deviation (n = 3).

View larger version (28K): [in a new window]   Fig. 4. Effects of organic ligands on the recovery of phytase-hydrolyzable P fraction in Unicorn and Christiana soils. Error bars represent standard deviation (n = 3).

View larger version (34K): [in a new window]   Fig. 5. Bioactive P relative concentrations in the 0- to 10-cm depth of Christiana silt loam in an orchardgrass–red clover stand after seven annual surface applications of dairy manure at three levels of P.

View larger version (59K): [in a new window]   Fig. 6. Distribution of the water-extractable inorganic and phytase-hydrolyzable P fractions of the 0- to 10-cm depth of Christiana silt loam in an orchardgrass–red clover stand after seven annual surface applications of dairy manure at three levels of P.