• Small Grain Variety Comparisons at the Maricopa Agriculutral Center, 1989

      Sheedy, M.; Ottman, M.; Ramage, T.; Ottman, Michael; Kingdon, Lorraine (College of Agriculture, University of Arizona (Tucson, AZ), 1989-09)
    • Variability in Salt Tolerance within a Population of Alflafa

      McKimmie, T.; Dobrenz, A. K.; Ottman, Michael; Kingdon, Lorraine (College of Agriculture, University of Arizona (Tucson, AZ), 1989-09)
      Genetic variability must exist for a selection program to be successful. Alfalfa seedlings were selected for salt tolerance after six weeks growth at 7500 ppm NaCl. The selection criteria considered plant height and survival. Variability for each factor within a population of alfalfa was shown. Both criteria were important and facilitated selection from those parents which contributed most to the salt tolerance of the population.
    • Wheat and Durum Variety Trial in Poston, 1989

      Winans, S. S.; Ottman, M. J.; Doerge, T. A.; Ottman, Michael; Kingdon, Lorraine (College of Agriculture, University of Arizona (Tucson, AZ), 1989-09)
    • Wheat Irrigation Scheduling at the Safford Agricultural Center, 1989

      Clark, L. J.; Carpenter, E. W.; Ottman, Michael; Kingdon, Lorraine (College of Agriculture, University of Arizona (Tucson, AZ), 1989-09)
      Wheat irrigations were scheduled using two computer models and an infrared thermometer, using three critical threshold values. Yields from these plots were compared with plots scheduled by the farm manager. The highest yield was obtained by the computer model using evapotranspiration data taken from the local AZMET station; this corroborates results from the previous year. The crop coefficients and the irrigation model that have been developed over the past several years are very accurate for this area. The two lower threshold infrared treatments were second and third in yield and had lower water use efficiencies.