groups to determina the relative زontribution of various
yield components to lint yield/square meter and lint
yield/plant (LY/P). The first group included the four
Egyptian cultivars Ga 80, Giza 66, Dendera and Giza 75.
The second group ilud.ed the two Upland cultivars Mcnaire
220 and Stonevili. L3. Path coefficient results indicated
that in both groups the number of boils per square meter
and number of boll per plant B/P were the main contributors
to lint yield variations per unit area and per plant, respec
tively. Second in importance were seed per boll and lint
per seed. The joint effect of charcters contributing to
yield of lint as indirect effects were very small. Similarly,
the residual effects were trivial in magnitude, indicating
that the main biological units contributing to lint yield
were included in the models. Thus, in conclusion selection
to improve lint yield of cotton should be directed toward
the prolificacy of B/ma or B/P and S/B or LIS in the breeding
materia).