• 1986 Publications of the Western Cotton Research Laboratory, USDA, ARS

      College of Agriculture, University of Arizona (Tucson, AZ), 1987-03
    • The Evolution of Subsurface Drip Irrigation on Sundance Farms

      Wuertz, Howard; Tollefson, Scott (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Outlook on Cotton Markets and Marketing for 1987

      Firch, Robert S. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Development and Fecundity of Aphis gossypii (Homoptera: Aphididae) on Cotton

      Akey, David H.; Butler, George D.; Western Cotton Research Laboratory (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Cotton aphids. Aphis gossypii. from a source near Phoenix. AZ were found to have an optimal developmental temperature of 27.5 °C with a developmental time of 5 days. Fecundity was optimal at 25 °C with 2.85 mean nymphs/day. Both development and fecundity were linear. The optimal temperature for fecundity was higher than those previously reported for cotton aphids in more moderate climates.
    • Varietal Resistance to Alternaria Macrospora

      Cotty, Peter J.; Department of Plant Pathology (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Greenhouse techniques were developed to evaluate cotton cultivar susceptibility to Alternaria leaf spot. Results indicate that Deltapine Acala 90 is more susceptible to Alternaria leaf spot than other Gossypium hirsutum varieties tested but that it is less susceptible than the G. barbadense varieties Pima S-5 and Pima S-6.
    • An Evaluation of the BioHUmaNetics Cotton Growth Program

      Hofmann, W. C.; Else, P. T. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Plant growth products manufactured by BioHumaNetics, Inc. were evaluated in 1986 for a second consecutive year in the same field at the Maricopa Agricultural Center. Treatments included: 1) no fertilizers added, 2) standard fertilization recommended for the farm, and 3) a treatment schedule prescribed by BioHumaNetics. The non fertilized treatment had a significantly lower total yield than the two fertilized treatments.
    • Narrow Row Cotton Evaluation, Marana Agricultural Center

      Thacker, Gary W. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      In a preliminary, unreplicated test, cotton was planted in 40 inch and 27 inch rows on April 10 and again on May 1. Narrow rows outyielded 40 inch rows at both planting dates. The yield difference between the row spacing treatments was greatest in the May 1 planting. Both row spacings had higher yields when planted on the later date, as did both the DPL 90 and ST506 varieties used in the test.
    • The Effects of Burst Yield Booster on DPL 61

      Hofmann, W. C.; Else, P. T. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      The third year was completed of a study designed to evaluate the effects of Burst Yield Booster, a cytokinin based plant growth regulator, on upland cotton. Five treatments were included in the 1986 experiment, which varied application timing, rate, and frequency. Consistent with our studies of the past two seasons, no significant differences in yield were observed.
    • Effect of Timing and Herbicide Compatibility in the Application of Burst on Upland Cotton

      Stedman, Sam (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      A field trial was conducted to study the elements of application timing and herbicide compatibility in the use of Burst, a plant growth regulator, and the effects of these two factors on yield of upland cotton. Eight treatments combined the two factors of timing and tank mix. The results showed no significant difference in yield between treatments.
    • Nitrogen Stabilizer Effect on Nitrate Nitrogen Management in Soils

      Farr, C. R. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Pima County Breeding and Genetics

      Turcotte, E. L.; Percy, R. G.; Cotton Research Center (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Five experimental strains and Pima S-6 were grown in seven Regional Tests across the Pima belt in 1986. P67 averaged highest in yield below 2,500 feet, and P65 averaged highest in yield above 2,500 feet elevation. Overall, Pima S-6 yielded 5% less than P67, the top yielding strain across locations. A new monogenic recessive aberrant leaf mutant in Pima was named wrinkled leaf-2 and assigned the gene symbol wr2.
    • The Effect of Nitrification Inhibitors on Nitrogen Use Efficiency in Drip and Furrow Irrigated Cotton

      Doerge, Thomas A.; Tucker, T. Curt (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      The use of nitrification inhibitors delays the conversion of ammonium fertilizers to the nitrate form and has the potential to increase nitrogen use efficiency in irrigated agriculture. Two field experiments were conducted at the Maricopa Agricultural Center in 1986 to evaluate the effect of two nitrification inhibitors (N-Serve and an experimental compound, ACP) on the growth, yield, nitrogen uptake, and fertilizer use efficiency obtained by growing cotton using buried-drip and furrow irrigation. ¹⁵N labeled ammonium sulfate was applied with and without nitrification inhibitors at the beginning of the season. Whole plant samples were taken at the end of the season to determine N uptake efficiency. No significant differences in growth, lint yield or N uptake efficiency were detected due to the application of either inhibitor. The conditions where nitrification inhibitors might improve nitrogen use efficiency in furrow irrigated cotton production are discussed.
    • Antibiosis in Cotton to Pink Bollworm

      Wilson, F. Douglas; Szaro, Jayne L.; Stapp, Benny R.; Western Cotton Research Laboratory (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Ninety-nine germplasm lines and a resistant check line of cotton, Gossypium hirsutum L., were infested artificially in the field with eggs of pink bollworm (PBW), Pectinophora gossypiella (Saunders), and evaluated for an antibiosis type of resistance to the insect and also for yield potential. All 99 lines came from crosses of well -adapted cultivars, or the nectariless, or nectariless-okra-leaf versions of those cultivars, with previously identified sources of antibiosis (a type of resistance that affects the growth and development of the insect once inside the boll). Twenty-three of the 99 were selected for low PBW damage or for a combination of high lint yield and low damage.
    • Short Staple Variety Demonstration

      Clapp, Carl; Stedman, Sam (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Effect of Spray Dilution on PIX on Cotton, Safford Agricultural Center, 1986

      Clark, Lee J.; Thatcher, L. Max; Department of Plant Science (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Irrigation Termination Under a Volunteer Grower Boll Weevil Program

      Farr, C. R. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Effects of XE1019 and PIX on Cotton at Marana and Maricopa Agricultural Centers

      Briggs, R. E.; Ledbetter, C. A.; Nelson, J. M. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      PIX was applied to cotton in 10 and 20 gallons of water to evaluate the effect of dilution rate on plant growth regulation. No statistical differences were seen at the one pint rate, but the trends looked like the higher rate of water increased the plant growth regulation (i.e., decreased plant height and increased yield). Increasing the rate of PIX to 2 pints in 20 gallons of water, to maintain the same concentration as 1 pint in 10 gallons of water, was detrimental to the yields.
    • Plant Growth and Seed Cotton Yield of Upland Cotton Fertilized with Liquid Sewage Sludge

      Day, A. D.; Taylor, B. B.; Pepper, I. K.; Minnich, M. M.; Department of Plant Sciences | Department of Animal Sciences; Department of Soil and Water Science (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
      Seedling emergence, plant establishment, plant height, and seed cotton yield for cotton grown with liquid sewage sludge were similar to the seedling emergence, plant establishment, plant height, and seed cotton yield for cotton grown with recommended inorganic fertilizer. High applications of liquid sewage sludge decreased water penetration in Pima clay loam soil.
    • Response of Texas Root Rot to Two Sterol-Inhubiting Fungicides and a Soil Sterilant in Graham County, 1986

      Clark, Lee J.; Cluff, Ronald E. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)
    • Cyanazine Combinations Preplant for Broadleaf Weed Control in Cotton

      Chernicky, J. P.; Hamilton, K. C.; Heathman, E. Stan; Barstow, Ben B.; Department of Plant Science (College of Agriculture, University of Arizona (Tucson, AZ), 1987-03)