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This article in SSSAJ

  1. Vol. 43 No. 3, p. 610-612
    Received: Mar 10, 1978
    Accepted: Feb 6, 1979

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Comparative Performance of Nitrogen Sources on Smooth Bromegrass and Tall Fescue1

  1. R. E. Lamond,
  2. L. S. Murphy,
  3. C. W. Swallow and
  4. K. W. Kelley2



Studies were initiated in 1973 at two locations in eastern Kansas to evaluate the performance of five N carriers as sources of N for bromegrass (Bromus inermis L.) and tall fescue (Festuca arundinacea Schred.). Late winter applications of ammonium nitrate, urea, urea-ammonium nitrate solution (UAN), sulfur-coated urea (SCU), and urea-ammonium sulfate (UAS) were compared at rates of 67, 134, and 201 kg N/ha.

Excellent visual responses to applied N were evident in both years. Total yields of forage generally increased with N applications up to 201 kg N/ha. The response to N decreased as the rate was raised from 134 to 201 kg N/ha. Maximum economic return from the application of N occurred at a level of about 134 kg N/ha. No clear-cut superiority was established for any N carrier. Sulfur-coated urea performed well on tall fescue but less effectively on bromegrass. Although there was evidence of delayed release of N from SCU, its efficiency as measured by total yield was similar to conventional N sources. The effectiveness of a carrier was influenced by location, environmental conditions, and grass species.

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