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This article in AJ

  1. Vol. 61 No. 4, p. 489-492
    Received: June 10, 1968

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Sulfur-Coated Urea and Uncoated Soluble Nitrogen Fertilizers for Fescue Forage1

  1. D. A. Mays and
  2. G. L. Terman2



Field experiments were carried out during 1965–67 to compare rates, sources and times of N topdressing for ‘Kentucky 31’ fescue (Festuca arundinacea). Uncoated ammonium nitrate (AN), urea, and other readily soluble N fertilizers resulted in higher first-cutting yields, which were higher in content of total N. Sulfur-coated urea (SCU) resulted in lower first-cutting and higher later-cutting yields than did the soluble N sources. Total annual yields were usually similar with all N sources. Mixtures of AN and SCU or split applications of AN resulted in the most uniform seasonal growth and N content. Lower yields and apparent crop recovery of N from uncoated urea and urea ammonium phosphate (UAP) indicated lower efficiency of these urea-containing N sources for topdressing, particularly at higher N rates. December, January, February, and March topdressing dates had rather similar effects on forage yields and N contents.

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