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This article in CS

  1. Vol. 29 No. 6, p. 1506-1510
    Received: Nov 7, 1988

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Intergenotypic Competition between Late-Planted Determinate and Indeterminate Soybean

  1. J. D. Sutton and
  2. D. B. Weaver 
  1. Dep. of Agronomy and Soils, 202 Funchess Hall, Auburn Univ., Auburn University, AL 36849



Studies of several crop plants including soybean, Glycine max (L.) Merr., have indicated a seed-yield advantage for certain genotype mixtures over the weighted mean of the component genotypes grown in pure stand. This 2-yr field study was designed to evaluate the performance of late-planted soybean mixtures consisting of determinate (‘Braxton’, ‘Foster’, and ‘Gordon’)/indeterminate (G84- 9010, G84-9043, and G82-8611) genotype combinations, and to examine the nature of competition between the two growth-habit types. Soybean genotypes differing in plant height and relative maturity were chosen to comprise the determinate/indeterminate genotype combinations. The two-component mixtures were planted at Tallas-see, AL in alternating 0.61-m rows and in seed ratios of 0:1, 1:3, 1:1, 3:1, and 1:0. No significant differences in mean seed yield were observed among mixtures and pure stands. A significant quadratic regression component was observed in yield of all genotypic combinations that included G84-9010 and G84-9043, each indicating undercompensation (yield less than the weighted mean of the components grown in pure stand). Combinations involving G82-8611 had no significant regression components, and were the most diverse in both height and maturity. Lack of overcompensation effects may have been related to a small range in diversity of days to maturity between the genotypes comprising each mixture (2-7 d) as well as the general competitive ability of each genotype. Soybean planted in alternating rows tended to yield higher than 1:1 mixtures. We concluded that the nature of competition between determinate/indeterminate genotype pairs when planted late is dependent on the competitive ability of the genotypes in the pair, and is likely to be undercompensatory.

Contribution from the Alabama Agric. Exp. Stn. J. Series no. 3-881895P.

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