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Regrowth Potential of Coastal Bermudagrass as Related to Previous Nitrogen Fertilization¹

This study evaluated the regrowth potential of Coastal bermudagrass differentially fertilized during a previous season with 0, 250, 500, 750, 1000, and 1250 pounds N per acre in 5 equal increments, respectively. Six-inch diameter dormant sod plugs were taken from each plot, potted, and placed in a dark chamber. Leaf growth was measured in weight of dry matter produced per sod plug. Carbohydrate reserves in stubble and rhizomes were determined by chemical analysis.

Regrowth after 6 weeks was closely related to the content of carbohydrate reserve present in the stubble and rhizome. Overall regrowth (18 weeks) mainly reflected the result of the first 6-week growth period and suggested that 6 weeks were adequate for this test. Sod plugs from plots fertilized at 500 pounds N per acre made the best regrowth. Least regrowth was made by sod plugs from plots fertilized at 750 pounds N per acre.

² Formerly, Rockefeller scholar in the Department of Agronomy (now Senior Research Officer, Ministry of Agriculture and Natural Resources, Research Division, Moor Plantation, Ibadan, Nigeria) and Associate Professor of Agronomy, University of California, Riverside.

Received for publication May 24, 1965.