• Douple Cropping with Controlled Traffic Tillage

      Thacker, Gary; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Double cropping barley and cotton, using a system of controlled traffic tillage, was compared to conventionally tilled, full-season cotton. In this test, the yields of the barley and late planted cotton were too low to be competitive with the full season cotton.
    • Lint Yield of Planting Pima S-6 at Three Dates

      Farr, Charles (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Planting Pima S-6 at 12-day intervals starting April 2 produced more than 70 pounds of lint loss for each delay in planting.
    • Lint Yield of Several Cotton Varieties Planted on Five Dates at Three Locations in Arizona in 1987

      Kittock, D. L.; Silvertooth, Jeff; Hofmann, C.; Malcuit, J.; Else, P. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Wide variations existed in the performance of cotton varieties over the five planting dates among three locations over three years. However, on the average, DP 77 performed best when planted between 27 March and 22 April at Maricopa and Marana. DP 90 was best for April and early May plantings at Safford. Stoneville 506 and DP 50 were among the best for May plantings. DP 20 Stoneville 112, and DP 50 averaged best for early June plantings, except Germain 510 was superior at Safford.
    • Progress of Cotton Harvesting in 1987

      Farr, Charles (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Cotton growers began cotton harvest earlier in 1987 than during the previous three years, but they fell behind the other years by December first. Rainfall in late October, particularly November 2, slowed harvest and reduced quality of cotton dramatically in some operations.
    • Ripping After the Uprooter-Shredder-Mulcher

      Thacker, Gary; Rein, Brad; Silvertooth, Jeff (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      This test was conducted on the LDS Church Farm in Marana to determine whether ripping after the Uprooter-Shredder-Mulcher (USM) benefits yields. The three treatments were rip furrows only, rip -beds only, and no ripping after the USM. Depth of water penetration was measured after the preplant irrigation; no significant differences were observed between the treatments. Differences in lint yields were not statistically significant, although average lint yields for the ripped treatments were higher.
    • Upland Cotton Defoliation Test

      Silvertooth, Jeff; Stedman, Sam (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      A field study was carried out to test the effectiveness of several defoliation treatments on Upland cotton in Pinal County. Three defoliation treatments were utilized. Results showed no significant differences among treatments in terms of percent leaf drop estimates taken seven and 14 days after initial application. Subsequent applications of defoliant materials were made to accomplish satisfactory levels of defoliation prior to harvest.
    • Variety/Date of Planting Test

      Pegelow, E. J. Jr. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Three upland cotton varieties (Stoneville 506, Deltapine 20, and Centennial) were planted on four dates in 1987 at the Maricopa Agricultural Center and observed for flowering, boll opening, and lint yield. Results from 1985-1987 are being used to develop heat unit models for the timing of these events.