| Summary: | A study was conducted to determine the possibility of growth of early varieties of cotton at Golpayegan Research Station by using a randomized complete block design with three replications. In this study, yield and yield components of 15 early genotypes of cotton were evaluated in comparison to “Varamin” cultivar during 2005-2006. The results indicated that in the first harvest, “Akala SJ 349”, “Akala SJ × cylinder” and “Shyrpan 539” genotypes, with a yield of 792, 827 and 858 kg ha-1of cotton wool respectively, had the highest yields. Earliness index of the three latter genotypes was higher than other genotypes. The total wool yield range was varied from 1101 kg ha-1 in the “Bulgarian 539” to 1359 kg ha-1 in “Mehr” cultivar, but there was no significant difference between the varieties. Length of sympodial branch in the three genotypes of Akala SJ 349, Akala SJ × cylinder and Shyrpan 539 were 32, 30 and 42 cm, respectively. Although in both harvests, a significant difference was not observed between genotypes in terms of length of the fibers, but the fiber length was significantly smaller in the second harvest. According to the results, more studies are needed at least with the genotypes used in this study, if cotton production is going to be recommended for the colder areas of the Isfahan province (e.g. City Golpayegan) in Central Iran.
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