• Lodging Control for Wheat and Barley in Arizona

      Ottman, Michael; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-03)
      Plant growth regulators are commonly applied to wheat and barley grown under high-yielding conditions to reduce the risk of lodging. Plant growth regulators reduce lodging by reducing plant height and strengthening the stem.
    • Management of Fertilizer Nitrogen in Arizona Cotton Production

      Silvertooth, J.C.; Norton, E. Randall; Ayala, Felix; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-01)
      Nitrogen (N) is the nutrient that is required most consistently and in larger amounts than other nutrients for cotton production. Common rates of fertilizer N applied in Arizona cotton production systems range from 50 to over 300 lbs N/acre. The management of fertilizer N is critical, both for insuring optimum cotton yields, and minimizing the potential for environmental contamination.
    • Summer Slump in Alfalfa

      Ottman, Michael; Mostafa, Ayman; School of Plant Sciences, University of Arizona (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2014-01)
      “Summer slump” is a decline in growth of alfalfa usually beginning in July in areas where maximum daily temperature exceeds 100 °F, such as the low elevation deserts of Southwestern U.S (Fig. 1). In more temperate regions, there is a gradual decrease in alfalfa yield in successive harvests throughout the year, but the yield decline in the summer is not as sharp as in hot summer regions. The term summer slump has also been applied to reduction in growth of perennial cool season grasses such as tall fescue during the summer.