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Soybean Harvest Index in Hill-Plots¹

Seed and plant weight of mature soybeans (Glycine max (L.) Merr.) were measured in hill-plots to determine if the evaluation of harvest index (seed yield/mature plant dry weight) by a micro-plot technique would be useful as a selection criterion. Harvest index did not change in response to increasing plant population within hills. Thus, screening can not be carried out in this manner to obtain cultivars which would maintain a high harvest index under high plant density in row culture. Furthermore, harvest index was negatively associated with yield and maturity, and appears to be of little value as an indicator of yielding ability.

Key Words: Glycine max • Breeding • Selection • Plant population

² Breeder and physiologist, respectively.

Received for publication May 5, 1977.