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Bermudagrass Management in the Southern Piedmont USA. II. Soil Phosphorus

USDA–ARS, J. Phil Campbell Sr. Natural Resource Conservation Center, 1420 Experiment Station Road, Watkinsville, GA 30677-2373

View larger version (48K): [in a new window]   Fig. 1. Depth distribution of Mehlich-I extractable soil phosphorus using Sampling Protocol I as affected by fertilization and harvest strategies during the first 5 yr of bermudagrass management. Horizontal bars are LSD at P = 0.1 to separate all combinations of fertilization and harvest strategies within a soil depth.

View larger version (33K): [in a new window]   Fig. 2. Temporal change in Mehlich-I extractable soil phosphorus using Sampling Protocol I at a depth of 0 to 6 cm as affected by fertilization and harvest strategies during the first 5 yr of bermudagrass management. Within a harvest strategy, regression lines marked with * and ** are significantly different from other fertilization strategies at P < 0.05 and P < 0.01, respectively.

View larger version (26K): [in a new window]   Fig. 3. Mehlich-I extractable soil phosphorus using Sampling Protocol I as affected by fertilization strategy averaged across low and high grazing pressures and as a function of distance from animal shades and soil depth. Error bar within a soil depth is LSD at P = 0.1 to separate means among fertilization strategy and distance from shade.