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Influence of Plant Population on Yield and Other Characteristics of Soybeans¹

An investigation was conducted at Experiment, Georgia, during the period 1964 through 1966 to study effects of plant population on soybean (Glycine max (L.) Merr.) yield and other agronomic characteristics of varieties of different maturity. The 6.6 plants per meter of row (2 plants per foot) produced maximum yields (that point at which there were no further significant increases) of ‘Bragg’; all other varieties required 26.2 plants per meter (8 plants per foot). Plant height increased as populations increased through 26.2 plants per meter of row for all varieties except ‘Hardee’, which required only 13.1 plants. Lodging was a serious problem only in Hardee during 1966, and this was apparently associated with stem breakage due to stem girdling and excessive height. Weed populations and development of lower pods closer to soil level occurred in populations below 13.1 plants per meter of row. An inverse relationship between seed size and plant population was observed for Lee only.

Key Words: soybean yield • soybean variety maturity • Glycine max (L.) Merr

² Assistant and Associate Agronomist, University of Georgia College of Agriculture Experiment Stations, Georgia Station.

Received for publication March 27, 1967.

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