Competition among Adjacent Rows of Grain Sorghum of Different Height Genotype1
- J. J. Kern and
- R. E. Atkins2
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 3✕3- and 4✕3-dwarf height genotypes were bordered by themselves and, in turn, by each other. Grain yields of 3✕3 hybrids were enhanced about 4% when 4✕3 border rows were used, and yields of 4✕3 hybrids were depressed about 3% when bordered by 3✕3 hybrids. Row spacings, female parents, and pollinators did not exert pronounced or consistent effect on the competition attributable to height differences. Hybrids having a 3✕3 height genotype usually exceeded the 4✕3 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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