• Effect of 2,4-D on Composition and Production of an Alpine Plant Community in Wyoming,

      Thilenius, J. F.; Smith, D. R.; Brown, G. R. (Society for Range Management, 1974-03-01)
      Use of 2,4-D in an alpine plant community in the Medicine Bow Mountains of Wyoming almost completely eliminated Geum rossii. The graminoid: forb ratio of the vegetation was altered from approximately 3:7 to 8:2 without appreciably changing total standing crop or its digestible dry matter content. Resurgence of forbs could not be detected up to 4 years after treatment.
    • Vegetation Changes Following Fire in the Pinyon-Juniper Type of West-Central Utah

      Barney, M. A.; Frischknecht, N. C. (Society for Range Management, 1974-03-01)
      The stages of succession following fire began with weedy annuals that reached a peak within 3 to 4 years. Juniper woodlands were well developed 85 to 90 years following fire. Intermediate stages of succession varied, but followed a general pattern of perennial grasses, perennial grasses-shrubs, and perennial grasses-shrubs-trees. The percentage of dead sagebrush was positively correlated with density of junipers. Thirty-three years was the average minimum age at which Utah juniper produced seed.
    • Urea as a Nitrogen Fertilizer for Great Plains Grasslands

      Power, J. F. (Society for Range Management, 1974-03-01)
      Economics and pollution standards indicate that urea may soon be the prime nitrogen fertilizer source in the Great Plains. Available literature was reviewed on the use of urea as a fertilizer for grasslands, particularly in semiarid regions. Results from only a few such experiments were found. However, these results agree with those from more humid or subtropical regions in that urea was as effective as ammonium nitrate at low, but not at high, rates of application. Maximum production attainable with urea is probably less than that attainable with ammonium nitrate.