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Bermudagrass Management in the Southern Piedmont USA

VI. Soil-Profile Inorganic Nitrogen

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

View larger version (35K): [in a new window]   Fig. 1. Seasonal distribution of long-term mean precipitation (bars), long-term mean potential evapotranspiration calculated from Turcs method (line), and actual precipitation during the 5-yr study (symbols).

View larger version (40K): [in a new window]   Fig. 2. Depth distribution of NO3–N and NH4–N as affected by type of fertilization during the first 5 yr of bermudagrass management. Error bars at the right side of each panel indicate LSD at P = 0.1 to separate means of fertilization type within a soil depth. *Indicates significant difference between at least two treatments.

View larger version (47K): [in a new window]   Fig. 3. Soil inorganic N during the first 5 yr of bermudagrass management as affected by harvest strategy in the upper rooting zone (0–0.3 m), in the lower rooting zone (0.3–0.9 m), below the rooting zone (0.9–1.5 m), and within the entire soil profile (0–1.5 m). Error bars at the bottom of each panel indicate LSD at P = 0.1 to separate means of harvest strategy within a year. *Indicates significant difference between at least two treatments.