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Blendability of Phenotypically Similar and Dissimilar Winter Barley Cultivars¹

The objectives of the reported research were to compare the performance of winter barley (Hordeum vulgare L. emend. Lam.) and to determine if overcompensation would be associated with blends of similar or dissimilar phenotypes. The performance of 28 bi-line blends, each in a 1:1 genotypic ratio, was compared with the performance of the eight component lines grown in monoculture. The eight component lines of winter barley were chosen to provide a gradient in the phenotypic expressions of heading date, plant height, grain yield, and awnness. Significant overcompensation or undercompensation for grain yield was not found in any combination of like or unlike phenotypes; however, several blends did show a trend for overcompensation. Nineteen of the 28 blends were higher yielding than the midcomponent. Eight of the blends had higher yields than the higher-yielding component grown in monoculture. The 28 blends averaged 2% higher yields than the midcomponent. Grouping into small, intermediate, or large phenotypic differences did not result in groups exhibiting significant overcompensation or undercompensation. Phenotypic selection was not effective for identification of lines whose blends would exhibit overcompensation.

Key Words: Intergenotypic effects • Competition • Varietal mixtures

² Agronomy Advisor. Northeast Agricultural Center, The Phra, Khon Kaen, Thailand; Professor and Associate Professor of Agronomy, University of Kentucky, Lexington, Ky. 40506.

Received for publication April 3, 1972.