• Comparative Responses of Three Cotton Varieties to Mid-July 2005 Application of Chaperone™ in the Palo Verde Valley

      Rethwisch, Michael D.; Milke, Jose; Wellman, Jessica J.; Luna, Manuel; Ramos, D. Michael; Van Dyke, Joe; Tronstad, Russell; Norton, E. Randy (College of Agriculture, University of Arizona (Tucson, AZ), 2006-07)
      Chaperone™ was applied in mid-July to three different cotton varieties (DPL 449BR, DPL 555BR, STV 5599BR) being grown in the same field. Varieties differed in their responses, with application of Chaperone™ resulting in fewer fruiting structures per plant than untreated DPL 449BR or STV 5599BR, but more such structures in DPL 555BR. Seed cotton yields were increased in DPL 555BR by almost 300 lbs./acre by application of Chaperone™, but were only about 20 lbs./acre greater in the other two varieties. A higher percentage of lint in seed cotton was associated with Chaperone™ application in both DPL 449BR and STV 5599BR, but a lower percentage in DPL 555BR. Calculated lint yields increased in both DPL 449BR and STV 5599BR, but yields were almost identical for treated/untreated DPL 555BR in this experiment. Application of Chaperone™ resulted in a slight increase in fiber uniformity in all three varieties.
    • Comparison of Three Plant Growth Regulator Products on April Planted DPL 555BR Cotton, 2005

      Rethwisch, Michael D.; Swan, Ron; Luna, Manuel; Ramos, D. Michael; Wellman, Jessica; Tronstad, Russell; Norton, E. Randy (College of Agriculture, University of Arizona (Tucson, AZ), 2006-07)
      Three plant growth enhancement treatments were applied to April-planted DPL 555BR cotton on the morning of July 2, 2005. Plant parameter data were obtained during July, and yield and quality data were obtained at harvest in December. Usage of ChaperoneTM resulted in decreased potassium and phosphorus levels in petioles, as well as increased amounts of leaf chlorophyll. Treatments initially resulted in less fruiting structure/plant but had more than the untreated cotton at 26 days post treatment, with highest numbers per plant noted from the HappyGroTM + PhotoGro treatment. Each treatment resulted in less seed cotton and lint per acre than the untreated cotton. Less spotting associated with treated cotton increased the lint strength and increased trash levels. The AuxiGro® WP + CalMax® + Foliar Pride treatment resulted in the highest fiber strength per pound and lint value.
    • Effects of Goëmar® BM86 and Mepiquat Chloride on DPL 449BR/DPL 494R Cotton

      Rethwisch, Michael D.; Cox, Tim; Ramos, D. Michael; Luna, Manuel; Wellman, Jessica; Tronstad, Russell; Norton, E. Randy (College of Agriculture, University of Arizona (Tucson, AZ), 2006-07)
      A field experiment compared several rates of mepiquat chloride and Goëmar® BM86 on Upland cotton in the Palo Verde Valley during 2005 for their effects on cotton growth and yields. Leaf chlorophyll levels were significantly increased in DPL 449BR by usage of mepiquat chloride on initial samples dates after applications, and these treatments also effected cotton heights. Retention percentages and numbers of fruiting structures per plant were initially increased by treatments which contained Goëmar® BM86, although late in the season significant differences existed between Goëmar® BM86 treatments as a result of interaction with mepiquat chloride. All treatments resulted in a slight (0.01 inch) increase in fiber length as well as staple, resulting in increased lint value. The combination treatment of Goëmar® BM86 plus 12 oz./acre of mepiquat chloride had highest cotton value ($1,035/ acre), and was worth $178/acre more than the untreated check.