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This article in CS

  1. Vol. 26 No. 5, p. 1043-1046
     
    Received: Aug 29, 1985


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doi:10.2135/cropsci1986.0011183X002600050041x

Soybean Cultivar Mixtures in a Narrow-Row, Noncultivatable Production System1

  1. L. E. Schweitzer,
  2. W. E. Nyquist,
  3. J. B. Santini and
  4. T. M. Kimes2

Abstract

Abstract

A yield advantage of some cultivar mixtures has been observed in soybean (Glycine max (L.) Merr.] in that their yield has exceeded the weighted mean of the component cultivars grown in pure stands. However, no previous work has evaluated the performance of mixtures of soybean cultivars differing in both height and relative maturity and grown in a noncultivatable, narrow-row production system. The objective of this 2-yr field study was to evaluate the performance of mixtures of short-determinate (early ‘Gnome’ or late ‘Elf’) and tall-indeterminate (early ‘Century’ or late ‘Williams’) cultivars grown in 0.13-m row widths. Ratios of 100:0, 80:20, 60:40, 40:60, 20:80, and 0:100 were used for the components in each two-cultivar mixture. A significant (a = 0.05) quadratic component was observed in regression analysis of yield of Elf-Century mixtures, indicating overcompensation. The predicted mean yield for the highest yielding ratio, 54 Elf/46 Century, was 11% greater than the pure stand yield observed for its higher yielding component, Elf, and 12% greater than the weighted mean yield of 54 Elf/46 Century based on purestand performance. The quadratic component was significant at a = 0.10 for Gnome-Century mixtures, indicating undercompensation as compared with the pure-stand performance of Gnome and Century. Elf-Williams and Gnome-Williams mixtures showed no significant regression components. Diversity in relative maturity, as well as height, may have contributed to overcompensation by Elf and Century grown in mixtures in this narrow-row environment. This combination of the short-late Elf with the tall-early Century was the most diverse of the cultivar pairs evaluated in mixture.

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