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Harvest index values were studied in cereals during 1964 to 1967. A high degree of variability was found in the harvest index of winter wheat and other cereals. Stems contributed the greatest amount of dry weight to the straw yield and thus, as a vegetative part, materially influenced the harvest index. Reduction in plant height had the greatest effect on the stem dry weight and least on grain yield. Reduction in plant height lowered the dry weight of the vegetative parts and thereby lowered the straw yield which resulted in an increased harvest index. Harvest index was positively correlated with grain yield but negatively correlated with vegetative growth.

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