Abstract
The shade-tolerant cover legume Calopogonium caeruleum is promiscuous in its nodulating habits. In sand culture, symbiotic effectiveness of the strains tested was variable; 6 strains of rhizobia markedly improved shoot yields and 20 increased shoot N content. In pot experiments using cultivated and non-cultivated soils, inoculation gave no significant increase in shoot yields. When grown under rubber in plantation conditions at four localities, shoot dry matter yields, N content and nodulation also were not different from uninoculated plants when sampled for up to 2 yr after planting. This occurred despite the low numbers (< 10 g −1 soil) of native rhizobia at some sites and an appreciable establishment (> 70% recovery in nodules) by the inoculant strains.
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