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Response of Soybean Genotypes to Spacing in Hill Plots¹

Experiments were conducted in a systematic design at 10 spacings ranging from 30 to 122 cm using determinate and indeterminate soybean genotypes (Glycine max.(L). Merrill) of both ‘Clark’ and ‘Harosoy.’ Yield and other characters were evaluated to determine the optimum spacing for evaluating maturity group II and IV soybean genotypes in hill plots. Competition between genotypes was also characterized.

Yield consistently increased as spacing between hills increased in all genotypes except the short determinate dt₁. In general, the tall determinate, Dt₂, and the indeterminate genotypes of each variety matured earlier and lodged least at the intermediate spacings. The dt₁ determinates lodged little and tended to mature progressively later as distance between bills increased. Plants, in general, were taller at the closest spacing and progressively shorter as spacing increased. The genotypes of Harosoy differed in response to spacing for seed weight. Seed weight in dt₁ increased as spacing between hills increased, while seed weight for Dt₂ and indeterminate Harosoy tended to increase as spacing between hills increased. Seed weight in all the Clark genotypes tended to increase as distance between hills increased

Competition between the determinate and indeterminate genotypes within each variety revealed few significant differences for any character. Competitive effects on yield among genotypes diminished as spacing increased and were nonexistent at 65 cm between hills and beyond.

Key Words: Glycine max • Competition

² Graduate Research Assistant, Purdue University; Research Geneticist and Research Agronomist, Crops Research Division, Agricultural Research Service, USDA, and Associate Professor; and Professor of Agronomy, respectively, Purdue University, Lafayette, Ind. 47907.

Received for publication May 20, 1970.