Study of Yield Stability of Promising Diploid Cotton Lines using Parametric Methods

    Indigenous diploid cotton is cultivated in many areas of country due to the saline soil and water. To study adaptability and seedcotton yield stability of three promising native cotton lines selected from interspecific hybrids of G. herbaceum & G. arboreum including three lines along with two diploid controls were planted in a randomized complete block design in four locations (Kashmar, Nishabour, Sabzevar and Feyz-Abad for two years 2017-2018. Number of opened and closed bolls in plant, crown diameter, seedcotton yield, boll weight, Number of vegetative and fertile stems, plant height, fiber percentage and earliness were measured. Combined analysis of variance for two years and four locations were performed. Finlay and Wilkinson linear regression coefficient and, Lin and Binns parameters, were used for determination of stable cultivars. Interaction of year × location × genotype on seedcotton yield was significant. Genotype KD-92-11 with 58.02%, KD-92-19 with 57.92% and KD-92-17 with 56.94% had the highest early maturity. The line KD-92-17 with 1030 Kg/h, had the highest seedcotton. Also, KD-92-17 with 20.1 and 19.1 produced the highest fertile branch and open boll among diploid lines, respectively. Results of stability analysis with Lin and Binns method showed that KD-92-19 had the lowest inside location variance for seedcotton yield. The KD-92-19 had the highest yield stability and can be recommended for locations that have saline irrigation water and soil.