• Effects of Sewage Sludge on Cotton Lint Quality

      Day, A. D.; Taylor, B. B.; Pepper, I. L.; Minnich, M. M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Three field experiments were conducted in Avra Valley, Arizona, in 1986, to compare the lint quality of upland cotton fertilized with liquid sewage sludge with the lint quality of cotton fertilized with commercial inorganic fertilizer. Most lint quality components were similar for cotton fertilized with sewage sludge or inorganic nitrogen. Fertilization of cotton with sewage sludge tended to increase lint yield and decrease lint quality. Fertilization of cotton with sewage sludge increased vegetative growth and delayed lint maturity.
    • Effects of Sewage Sludge on Heavy Metals in Cotton Seed

      Day, A. D.; Taylor, B. B.; Pepper, I. L.; Minnich, M. M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      In 1987, seed samples from three cotton fields in Avra Valley, Arizona, grown with liquid sewage sludge and inorganic nitrogen fertilizer, were analyzed for five heavy metals. Concentrations of cadmium, copper, lead, nickel, and zinc were similar in cotton seeds fertilized with either sewage sludge or inorganic nitrogen fertilizer. The levels of all five metals were well below the allowable EPA limits.
    • An Evaluation of an Alternative Commercial Fertilization Program for Cotton

      Hofmann, W. C.; Else, P. T. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      Plant growth products manufactured by BioHumaNetics, Inc. (BHN) were evaluated at the Maricopa Agricultural Center for the third consecutive year in the same field. Treatments included: 1) no fertilizers added; 2) standard fertilization used on cotton at the farm; and 3) a treatment schedule prescribed by BHN. Yields in 1987 were significantly different; the BHN treatment produced the highest yield, and the unfertilized treatment produced the lowest yield. Yields from all three treatments were substantially lower than corresponding 1986 yields.
    • Influence of Liquid Sewage Sludge on Commercial Cotton Production

      Day, A. D.; Taylor, B. B.; Pepper, I. L.; Minnich, M. M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      A field experiment was conducted in 1987 in Avra Valley, Arizona, to compare the plant growth and cotton lint yield from upland cotton fertilized with liquid sewage sludge with the plant growth and cotton lint yield from cotton fertilized with commercial inorganic fertilizer. Plant growth and cotton lint yields were similar when cotton was fertilized with liquid sewage sludge or inorganic fertilizers.
    • Preplant Zinc Applications to Short Staple Cotton in Marana, 1987

      Thacker, Gary; Silvertooth, Jeff (College of Agriculture, University of Arizona (Tucson, AZ), 1988-03)
      A preplant application of zinc was made to a short staple cotton field where the soil analysis had shown a zinc concentration of 0.64 ppm. No significant yield response was measured.