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Response of Soybeans to End-Trimming at Various Growth Stages¹

Two soybean (Glycine max (L.) Merrill) cultivars in each of maturity groups I to IV were end-trimmed at seven growth stages, from the first trifoliolate stage to maturity. Seed yield and seed size were recorded on two .3-m sections at the ends of plots and on a 3-m section in the center of plots. Data indicated that significant border effects in maturity groups II to IV, grown at Lafayette, Ind., extended more than .3-m from the ends of plots. Border effects could be adequately controlled by trimming .6 m from each end of the plots when the top pods on plants were fully extended with seeds approaching full size for cultivars in groups I to III. Trimming would have to be delayed until leaves on plants were 30 to 50% yellow with a few falling for group IV varieties or strains. Plot yields could be adjusted to those of 4.9-m rows trimmed at maturity by end trimming to 4.9 m at or before the first trifoliolate stage and multiplying plot yields by .874, .840, .796, and .755 for cultivars in maturity groups I to IV, respectively. Size of seed on plants at the ends of rows was increased only when end trimming was done at full bloom or as soon as flowering ceased.

Key Words: Glycine max (L.) Merrill • Border effects • Competition • Plot yield

² Research Geneticist, Crops Research Division, ARS-USDA, and Associate Professor of Agronomy, Purdue University, Lafayette, Ind., 47907.

Received for publication March 2, 1970.

This article has been cited by other articles:

				S. J. Meis, W. T. Schapaugh Jr., and G. A. Milliken Relative Performance of Soybean in End-Trimmed and Plant-to-Length Plots Crop Sci., May 1, 2002; 42(3): 700 - 704. [Abstract] [Full Text] [PDF]