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Competition among Adjacent Rows of Grain Sorghum of Different Height Genotype¹

A 2-year study was conducted at Ames, Iowa, to evaluate the role of plant height as a factor affecting interrow competition in grain sorghum (Sorghum bicolor (L.) Moench) performance tests. A secondary objective was to determine the effect of height genotype on several agronomic characters of sorghum. Hybrids having 3x3- and 4x3-dwarf height genotypes were bordered by themselves and, in turn, by each other. Grain yields of 3x3 hybrids were enhanced about 4% when 4x3 border rows were used, and yields of 4x3 hybrids were depressed about 3% when bordered by 3x3 hybrids. Row spacings, female parents, and pollinators did not exert pronounced or consistent effect on the competition attributable to height differences. Hybrids having a 3x3 height genotype usually exceeded the 4x3 hybrids in number of seeds/head, 100-seed weight, and grain yield, but they produced fewer heads/plant and bloomed later than the short hybrids.

Key Words: Sorghum bicolor (L.) Moench • Border effect

² Research Associate and Professor of Agronomy, Iowa State University, Ames.

Received for publication July 9, 1969.