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Interrelationships Among Dry Weight of Panicles, Threshing Percentage and Grain Yield in Sorghum¹

Evaluations of dry panicle weight and threshing percentage in relation to threshed grain weights were made from grain sorghum yield trials conducted at four Iowa locations over a 3-year period. Correlation coefficients of 0.91 to 1.00 for the association of panicle weight with threshed grain weight indicated that weights from unthreshed panicles may serve as an expedient and effective selection criterion for relative grain yield among a group of hybrids.

Variability exhibited among hybrids, locations and years for grain percentage of the panicle suggested that the use of a standard threshing percentage to estimate actual grain yields from dry weights of unthreshed panicles would not be advisable.

Grain yields estimated for each entry in all tests, using a regression procedure derived from dry panicle weights and a sampling of threshed grain weights, were compared with actual threshed grain weights. Examination of the deviations of estimated from actual yields for nearly 500 comparisons cast considerable doubt on the reliability of the estimation procedure. Ranges obtained between the largest positive and negative deviations among hybrids within each experiment were consistently larger than would be acceptable in most grain sorghum experiments. When precise evaluations for grain yield per se are needed, the separation of grain from the panicles seems a necessary procedure.

Key Words: Sorghum vulgare • dry panicle weight

² Professor, Research Associate, and former Research Associates in Agronomy, Iowa State University, Ames, Iowa 50010.

Received for publication October 6, 1967.