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Competition Among Oat Varieties Grown in Hill Plots¹

Five adapted varieties of spring oats, Avena sativa L., were used in a study of intergenotypic competition. All pairwise combinations of the five varieties were grown at two locations at four levels of competition in hills and three levels in rows. Some varieties were enhanced and other varieties suppressed in yield as a result of competition in both hill and row plots at both locations. The maximum effect measured was with the variety ‘Rodney’ which yielded 62% more when surrounded by hills of ‘Goodfield’ than when surrounded by itself. Varieties that were strong competitors yielded more, relative to weak competitors, when grown in single hill plots than in rows or hills bordered by the test genotype (testor). Yield of testors was negatively correlated with differences between testor and competitor height and maturity. However, mature height and date of heading were not significantly influenced by competition. The effects of competition were more pronounced for yield per se than for any of the yield components. Panicle number and number of seeds per panicle were affected more than seed weight.

Key Words: Intergenotypic competition • Yield testing • Avena saliva L.

² Research Associate, Associate Professor, and Assistant Professor of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101.

Received for publication January 9, 1970.

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