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Competition Between Two Genotypes of Lima Bean With Morphologically Different Leaf Types¹

The canopy structure of lima bean (Phaseolus lunatus L.) was manipulated with the goal of increasing seed yield. Structure was varied by using two leaf types, willow-leaflet and normal, in a replacement series (monocultures and mixtures with different proportions of the plant types) and at different total population densities in two field experiments. Yield was not improved by any of the mixtures. Mathematically calculated competition coefficients showed that they competed for the same resources and that the normal type dominated, with its dominance increasing with increasing population density. Leaf area profiles showed that these responses were associated with the preponderance of normal type leaves in the top strata of the canopy, leading to the conclusion that competition was primarily for light. Willow-leaflet seems to be a character that is detrimental to yield both in mixture with normal and in monoculture.

Key Words: Canopy structure • Replacement series • Population density • Harvest index • "Crowding" coefficients • Near-isogenic line

² Professor and specialist in agronomy and range science and field research representative, Chemagro Agricultural Division, Mobay Chemical Corp., Davis, Calif.

Received for publication March 14, 1969.