Özet:

Plant growth regulators such as mepiquat chloride (MC) and chlormequat chloride (CCC) are used to establish the balance between the vegetative and generative growth in cotton. This study was conducted to compare the different doses and application time of CCC with MC and un-treatment (control). The seven treatments including control (non-treatment), T1 (three sprays of chlormequat chloride), T2 (two sprays of mepiquat chloride), T3 (0.4 L ha-1 CCC), T4 (0.5 L ha-1 CCC), T5 (0.6 L ha-1 CCC) and T6 (0.7 L ha-1 CCC) were laid out in Randomized Complete Block Design with four replications. The differences among treatments were found to be significant for seed cotton yield (SCY), the number of bolls per plant (N/B), boll weight (BW), plant height (PH), earliness, ginning out-turn (GOT), fiber fineness (FF), specific seed weight (SWt/S), the number seeds per boll (S/B), single seed volume (V/S) and lint yield per boll (LY/B). Finally, a single application of CCC @ 0.7 L ha-1 at the stage of DAS 90-110 days recorded optimum yield, earliness and fiber characteristics. The effects of early CCC on seed were more important than fiber characteristics.

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