The experiment was conducted at Al-Haweja / Governorate of Karkuk during the season 2004 using ten varieties of cotton (Coker310, Lachata, Halab90, Halab33, Deer22, Nazley87, Montana, SP8886, Stonvill474 and Stonvill887. The varieties planted at mid April using Randomized Complete Block Design with three replications in two farms, the first under surface irrigation and the second under sprinkler irrigation using fixed system. The results showed:
Highly significant differences among varieties under the two irrigation methods, combining analysis showed highly significant differences between the two irrigation methods for all characters except boll weight, while the differences among varieties were significant for all studied characters. The interaction between the two factors was significant for number of vegetative branches and number of nodes to first flower branch , the surface irrigation method exceeded the sprinkler one for the most characters, the variety Montana exceeded the others for the most characters, the seed cotton yield showed significant positive correlations with plant height, number of flowering branches, number of bolls, boll weight and significant negative with number of vegetative branches and number of nodes to first flower branch under the two irrigation methods and their average, path coefficient analysis showed that number of bolls per plant had highest direct and indirect effects on seedcotton yield and can be used in breeding programs to improve seedcotton yield.