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Interactions of Soil Moisture, Nitrogen, and Clipping Frequency on Yield and Nitrogen Content of Coastal Bermudagrass¹

Studies were conducted at Thorsby, Alabama, during 1961 and 1962 to determine the interactions of soil moisture regime, rate of N, and clipping frequency on yield and N content of Coastal bermudagrass (Cynodon dactylon (L.) Pers.).

The major and most consistent interaction on yield was between moisture regime and N rate. Yield response to irrigation was obtained when N rates were 400 pounds or higher. The largest yield response to N rates was from the first increment at the higher levels of moisture. The interactions of N and irrigation on yield were restricted mainly to the rates of 200 and 400 pounds N per acre. Yield differences because of clipping frequency were greater at the higher soil moisture regimes and higher N rates. Average yields ranged from 1.19 tons per acre of oven-dry forage with no N at the high moisture regime clipped at 21-day intervals to 9.88 tons at the 1200-pound N rate at the high moisture regime clipped at 32-day intervals.

Nitrogen content of the above-ground portion of the plants increased with clipping frequency and rate of N, but was not affected by soil moisture regime. From 20 to 89% of the applied N could be accounted for in the above-ground portion of the plants.

² Research Soil Scientists, USDA, Thorsby, Alabama, and former Associate Professor of Agronomy and Soils (now Associate Professor of Botany and Plant Pathology), Auburn University.

Received for publication April 7, 1966.

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