Ten agronomie and fiber Properties were studied for
.heterosjs and inbreeding depression in six cotton parente
and their hybrids. Two parents Giza 45 and Giza 70 belong
to the extra—long group. The other four, viz, “Gira 66,
Giza, 67, Giza 69 and Giza 75” are long—staple cultivare.
In 1983 the six parents, their F118 and F2s were grown
in a randomized complete block design with six replications
at Sakha Experimental Station. Results showed significant
NP heterosis for seedcotton yield, hair weight and mean
length. However, useful heteroeje was significant for seed—
cotton only. Positive but insignificant useful heterosig
was detected for hair weight and mean length. Whilst, the
remaining traits showed no useful heterotic effects.
Although, most of the hybrids showed heterotic effects
over their mid—parent (NP), few only exhibited useful hete
rosis. As for seedcotton yield hybrids reflecting useful
heterosjs were those having either Giza 7 or Giza 70 in
their pedigrees. Inbreeding depres,on was trivial for
most of the traits. Exception from that. as the mean length
character which showed highly splfjcant inbreeding
depression.