Abstract
The purpose of this research was to introduce cultivars of high products in Gorgan region climatic
condition and study 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 the weight of
seed cotton in first harvest, and the number of monopodial branches and weight of seed cotton in
second harvest could explain the maximum 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, the weight of seed cotton in both the first and 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
