Un modèle d'association graminée-légumineuse : le mélange vesce (Vicia sativa L.)-avoine (Avena sativa L.)

Abstract

The mixtures obtained by varying the relative proportions of 2 species are characterized by different relationships between individuals in the mixed stand, and, consequently, by different individual responses. The growth dynamics of the above-ground biomass of 2 species (Vicia sativa and Avena sativa) was studied throughout the cropping cycle. Growth and development of oats was improved in the association, while vetch was strongly depressed. The biological interactions resulted in a competitive situation (with over-compensation), to the advantage of oats. However, when the proportion of vetch was higher than that of oats, vetch could be competitive. Relative proportion was the only factor of great significance in determining the yield of each species. The intensity of the relationships changed with the relative proportions of the constituent species and with the water supply.