All economically valuable traits of a cotton plant, including fiber yield, are a polygon trait with complex genetic determination and significant paratypic variability. The yield of cotton fiber and its defining elements is a complex hereditary trait, like other economically valuable traits it varies depending on the species, varietal characteristics and growing conditions. Differences in fiber yield are observed within the variety between individual plants grown under the same agro-technical conditions; sometimes these differences are significantly higher than the differences between the varieties. The change in the mass of 1000 seeds, the index and the fiber yield depends on the place of formation of the bolls within the cotton cut. Moreover, the best indicators of fiber yield were obtained from hybrids from the central part of the bush, the first and second places of the fruit branches of cotton species G.hirsutum L. The fiber yield decreases from the base to the top and from the center to the periphery of the bush. Hereditary changes in fiber yield are achieved in the process of selection with various methods of hybridization, selection of initial parental varieties and their combination in a hybrid combination.
Cotton, Yield, Sympathy, Variety, Crosses, Selection, Seeds, Bush, Boll, Fibers, Fiber index.
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