Response of Cotton Varieties Grown in a Short Season to Ethephon and Thidiazuron in the Arid Southwest

Louis A. Bariola and C.C. Chu


 
ABSTRACT

Eleven varieties of Upland cotton, Gossypium hirsutum L., were evaluated for their response to ethephon (=Prep®) and thidiazuron (=Drop®), applied as chemical terminators when grown under a short season system. The test was conducted as a split-plot design with varieties as main plots and chemical termination (three treatments and an untreated check) as sub-plots, with four replications. There were differences in the stages of maturity among the varieties on the date of last irrigation. Those varieties that had few green bolls and up to 90% open bolls began to regrow and flower and had more green bolls at harvest than the other varieties. DES-119, ST-506, and WC-12NL had yields of 1200 lbs/acre or more. There were no differences in yield due to chemical termination treatments and all treatments significantly reduced the number of green bolls at harvest. Plants treated with thidiazuron or with thidiazuron plus ethephon did not differ in leaf shed, but shed significantly more leaves than those in the untreated check or those treated with ethephon only.



Reprinted from 1988 Proceedings: Beltwide Cotton Production Research Conferences pp. 302 - 303
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998