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Effect of Seed Weight on the Vegetative Growth of Competing Annual Trifoliums¹

The effect of seed weight on the competitive abilities of crimson clover, Trifolium incarnatum L., and subterranean clover, T. subterraneum L., was studied in simple and mixed communities in a natural-light environment with nutrients and soil moisture nonlimiting. The yield of each component of the mixture was dependent mainly on its own seed weight (positive) and that of its associate (negative). The effect of seed weight on growth was essentially linear, and it remained so over time. The potential for a buffering effect giving community stability among species of diverse temporal and morphological growth patterns is discussed.

Key Words: leaf area index • replacement series • community stability

² Professor of Agronomy, University of California, Davis, Professor of Forestry and Natural Resources, University of Edinburgh, Scotland, and Professor of Agronomy, Waite Agricultural Institute, Adelaide, South Australia. Professor of Agronomy, Waite Agricultural Institute, Adelaide, South Australia, and Professor of Forestry and Natural Resources, University of Edinburgh, Scotland.

Received for publication April 4, 1968.