Comparison of inoculant media for sulfur-oxidizing plant growth promoting rhizobacteria in canola
The ability of rhizosphere microorganisms to influence plant growth is gaining considerable attention worldwide. Various studies have already proven the beneficial effect of plant growth promoting rhizobacteria (PGPR) on different agricultural crops (Kloepper, 1993; Banerjee, 1995). Canola, like other oil seed crop has high sulfur demand. In recent years, several attempts have been made to utilize S-oxidizing microorganisms to meet plant S requirement and to substitute costly S fertilizer. But the success is variable, as the information on S-oxidizing PGPR is limited and the mechanisms also not yet fully understood. In many cases, no standard methods were followed and different inoculation media were used. The population density and activities of microorganisms could vary with the inoculation media. The aim of the present study was to compare the effects of PGPR if any due to the difference in the commonly used inoculant media like seed, soil and elemental S fertilizer.
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