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.

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