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Influence of Plant Population on Field Performance of Three Soybean Cultivars¹

Soybean [Glycine max (L.) Merr.] seeding rates in commercial fields have generally been greater than necessary to obtain maximum seed yield. Because of higher seed costs, we conducted a field study to evaluate the agronomic response of three recently developed soybean cultivars on a clay loam (Aquic Argiudoll) to three plant populations – 171,000, 342,000, and 513,000 plants/ha. Significant yield increases were obtained in only 1 year as a result of higher plant population. Yields in the other years remained constant across populations. Plant height and maturity were not affected by plant population while lodging was increased at higher plant densities. The height above the soil surface of the lowest pod-bearing node increased as plant density was increased. Numbers of branches, pods, and seeds per plant decreased as population increased. Results presented herein indicate that soybeans have the capacity to compensate for a wide range in plant densities without affecting yield.

Key Words: Glycine max (L.) Merr. • Seeding rates • Plant densities

² Associate professor and professor, Univ. of Minnesota, Southern Exp. Stn., Waseca, MN 56093 and Univ. of Minnesota, Dep. of Agronomy and Plant Genetics, St. Paul, MN 55108, respectively.

Received for publication May 20, 1976.

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