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SYNOPSISStudies of 3 populations of F. families in the Fa and_ F, generations grown at 2 locations revealed the followmg factors: genotype year interactions relatively large; seed yield generally more heritable than total yield; herita-bility· of vigor lower for scores on J~ly 1 th~n those o~ Aug. 15; and exceptionally low genetic coefficient of vanation and heritability of vigor scores for the population segregating for procumbency.

Synopsis Plot error variances were large for lint yield, bolls per plant, seed per boll, and boll weight; small for lint percentage, seed and tint index, and fiber length, strength and fineness. Genotype x environment interaction variances were generally small for all traits except yield and bolls per plant. Lint yield was highly positively correlated with lint percentage and bolls per plant and negatively correlated with seed index and weight per boll.