Relationship between Plant Weight and Density in Mixed Populations of Medicago Sativa and Trifolium Pratense

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Abstract
Seeds of T. pratense L. and M. sativa L. were sown in equal proportions in mixtures at high densities. Thinning started earlier in T. pratense but in both species, after thinning commenced, it proceeded at the same rate. Both species underwent collective self-thinning in accordance with the -3/2 power law of Yoda et al. The 2 spp. considered separately both underwent thinning in accordance with the -3/2 power law but although the slopes for the 2 spp. were the same the intercepts differed strongly. Plants of M. sativa, of a given weight, could persist in the mixture at higher densities than plants of T. pratense.