Determination of Yield and Yield Criteria of Different Cotton Lines and Varieties

Cotton (Gossypium hirsutum L.) has a economic and strategic importance that provides raw materials to the textile sector. Efforts are being made to increase cotton yield and fiber quality through breeding studies carried out in the world and in Türkiye. It is necessary to determine the yield and yield criteria of the genotypes to be included in the breeding programs and to determine their superiority compared to the control varieties. In this research carried out for this purpose, 165 cotton genotypes were tested to determine yield and yield components. The trial was carried out in 2019 in the experimental area of Siirt University Faculty of Agriculture, Field Crops Department, in 4 blocks according to the Augmented trial design, and 165 genotype materials, including 160 cotton genotypes and 5 control varieties (Stoneville 468, BA 119, BA 440, Edessa, Lima) was used as plant material. In the study, seed cotton yield, plant height, number of monopodial and sympodial branches, number of nodes and number of bolls were examined. Results showed that the highest seed cotton yield were obtained from MNH-786, Dpl-5540-85-subokra and Mex 123 cotton genotypes and that these genotypes showed the highest values than the superior control variety. Deltapine 5816, Stoneville 213 and CIM-70 genotypes were found to be promising for plant height, VH 260, Stoneville 213 and Tamcot Sphinx for sympodial branches, and Deltapine 905, NIAB 777, Tonia and Stoneville 213 genotypes for boll number. The findings showed that there is a wide genetic variability among cotton genotypes in terms of yield and yield component, genotypes with ideal values in terms of desired characteristics can be used as parents in cotton breeding program and new cotton genotypes suitable for the textile sector can be obtained.