Abstract

The purpose of this research was to introduction cultivars of high products in Gorgan region climatic condition and studies the interrelationships between the seed cotton yields and several traits of 8 cotton genotypes at plant Institute, Gorgan, Iran. The experimental design was a randomized complete block design with four replications. A positive significant (P<1%) correlation was observed between yield and weight of seed cotton in first harvest. Stepwise regression and path analysis showed that, weight of seed cotton in first harvest, number of monopodial branches and weight of seed cotton in second harvest could explain the maximum of variations of yield (R2 = 0/963). The weight of seed cotton in first harvest had the highest direct effects on yield/plant (P = 1/087). Due to their high direct and or indirect effects on yield, weight of seed cotton in first harvest and weight of seed cotton in second harvest can be used as selection criteria to identify the high yielding genotypes. The result of lint quality showed that genotype Siokra from the view point of lint percentage, lint length, lint homogeneity, lint resistance and fiber strength has a better quality than Sahel cultivar.

Key words: Cotton, seed cotton yield, correlation, stepwise regression, path analysis, lint quality.