Abstract:

In this study, cotton planted as the second product after grain harvest, aims to determine the effects of defoliant applications on efficiency and quality. During two years in the 2006 and 2007 studies in the producer field in Söke, the ST 373 cotton variety was used and the plants were applied with different commercial names of defoliants and mixtures during the period in which the cotton coats opened 40-50%. According to the findings obtained, the best results in the leaves casting and cottage are obtained from defoliant mixture.Defoliant applications have not created a statistical difference on plant length, cottage number, cottage mass weight, production per plant, cottage mass production, cottage rand. Applications have caused the first-hand harvest rate to increase by 32.4 per cent according to control. Defoliant applications have not been statistically influenced on the fiber length and maturity values. Nevertheless, defoliants have statistically positively affected the fiber thinness, strength, uniformity, elasticity, foreign substance content and color characteristics. Applications have reduced the number of foreign substances, the area and the class of foreign substances in a way that increases the commercial value of the fiber. Features such as short fiber index, wire swallowability index, wire number strength have also been found to be significantly positively affected by applications. From the quality characteristics of seeds; the weight of 100 seeds, the fat ratio in the seed and the deforestation percentage of the seed are determined that defoliant applications have no statistically significant effect on the protein ratio in the seed and are effective on the protein ratio in the seed.

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