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  1. Vol. 58 No. 5, p. 510-512
     
    Received: Apr 7, 1966
    Published: Sept, 1966


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doi:10.2134/agronj1966.00021962005800050016x

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

  1. B. D. Doss,
  2. D. A. Ashley,
  3. O. L. Bennett and
  4. R. M. Patterson2

Abstract

Abstract

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.

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