This experiment was conducted at the Experimental Farm, Sakha Agricultural
Research Station during the successws growing seasons of 1998,1999 and 2000.
Two extra tong strains namely (Giza 84 X F. 108) and {Giza 45 X (Giza 45 X Giza
84)]. The genetical parameters of some economic characters were computed. The
potence ratio estimutes indicated over dominance for seed cotton and lint yield per
plant, boll weight, seed index and node number of the first fruiting branch. While, lint
percent, lint index and days to first flower showed partial potence ralios. Highly significant positive heterotic effect relative to mid-parent and better-
parent was. computed for seed cotton yield and lint yield while significant negative
heterotic effect relative mid-parent and better-parent was computed for lint percentage
and lint index. The inbreeding depression effect was highly significant for seed cotton yield,
lint yield •. and significant negative for lint percentage and lint inoex. HIghly significant values of additive and dominance were found for seed and
linl cotton yield With grealer magnitude for dominance than additive effect. Highly
significant positive value of the epistatic effect (additive X additive) was found for seed
cotton yield and lint yield per plant. A significant negative value of epistatic effect
(additive X dominance) was found (or seed cotton yield. Meanwhile, highly significant
negative values of epistatic effect (dominance X dominance) was showed for seed
cotton yield and lint yield. Moderate hertablities was calculal.ed for seed cotton yield
and, lint yield. Low values of hertablities for other trails.