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The Influence of Manure Phytic Acid on Phosphorus Solubility in Calcareous Soils

^a USDA-ARS, 3793N 3600E, Kimberly, ID 83341-5076
^b USDA-ARS, National Soil Erosion Research Laboratory, West Lafayette, IN
^c Purdue University, Dep. of Animal Science, West Lafayette, IN
^d University of Saskatchewan, Dep. of Animal and Poultry Science, Saskatoon, SK, Canada

View larger version (14K): [in a new window]   Fig.1. Relationship between the percentage of phytic acid P in manures and the percentage of water extractable P in the manures.

View larger version (24K): [in a new window]   Fig. 2. Change in Olsen inorganic P for all treatments over the 18-wk incubation period at the 40 mg kg–1 application rate on the (a) Portneuf and (b) Millville soils.

View larger version (23K): [in a new window]   Fig. 3. Change in Olsen organic P for all treatments over the 18-wk incubation period at the 40 mg kg–1 application rate on the (a) Portneuf and (b) Millville soils.

View larger version (13K): [in a new window]   Fig. 4. The relationship between the change in Olsen P from 2 to 18 wk of incubation and the percentage of phytic acid in the treatments for both soils.

View larger version (18K): [in a new window]   Fig. 5. The P nuclear magnetic resonance spectra (31P NMR) for soils receiving manure from C2 and extracted (a) immediately following manure incorporations and (b) after 12 wk of incubation.

View larger version (29K): [in a new window]   Fig. 6. The increase in Olsen P with treatment application rate for (a) Portneuf soil at 2 wk, (b) Portneuf soil at 18 wk, (c) Millville soil at 2 wk, and (d) Millville soil at 18 wk.

View larger version (16K): [in a new window]   Fig. 7. The relationship between manure phytic acid and change in Olsen P for all treatments on both the Portneuf and Millville soils. Regression equation is for manures from the corn-based diets only.

View larger version (10K): [in a new window]   Fig. 8. The relationship between increases in Olsen P resulting from manure application of 40 mg P kg–1 following 18 wk incubation and (a) manure C/P ratio on the Portneuf soil and (b) manure N/P ratio on the Millville soil.