Under acid lateritic soil at Vamban, the seed bacterization of Rhizobium japonicum have significantly increased the nodulation, plant growth and yield attributes on soybean cultivars viz., CO 1 and KM 1. However, the Inoculation of R japonicum as multistrains gave a better symbiotic performance over single strain inoculation. Among the cultivars, CO 1 recorded better symbiotic performance that the KM 1 in exhibiting better nodulation, plant growth and grain yield under field condition.
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