Interrelations Among Agronomic Characters in Grain Sorghum (Sorghum bicolor Moench)1

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Abstract
Genotypic and phenotypic correlations among 12 characters were estimated in segregating populations and in pure lines of grain sorghum (Sorghum bicolor Moench). Grain yield was positively and significantly correlated with head weight, kernel number, half bloom date, and leaf number, but negatively correlated with germination percentage and protein percentage. The inverse relationships between kernel weight and kernel number, and between kernel weight and head number per plant may arise from developmentally induced relationships or be genetically dependent. Head weight and half bloom date are considered best indicators for yield, while germination percentage may be of value as an indicator for protein content. Magnitudes of the estimates of expected progress in improving yield by selecting for characters other than yield appear to be greater than those for protein, indicating that direct selection for protein may be more effective in improving protein content.

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