Biofertilization by rhizobial inoculation in clay soils of Kanchanaburi, Western Thailand
1999
Grange, Ian | Natchapong Phudpong
Nitrogen fixation in legume plants depends on effective rhizobial inoculation. Legumes often fail to nodulated when introduced to an area because indigenous rhizobia are eigther not present or, too few in number to provide a good inoculum. The objective of this trail was to determine how effective the indigenous rhizobia of the clay soil of Kanchanaburi Horticultural Experiment Station were at inoculating legumes, as compared to introduced cultured rhizobia, and to determine what effect this might have on vegetative production. Pigeon pea (Cajanus cajan), cowpea KVC7 (Vigna sinensis) and velvet bean (Mucana spp.) were tested. Inoculated pigoen pea and cowpea plants had significantly more root nodules and were significantly taller than non-inoculated plants. This suggests that indigenous soil populations of the specific rhizobia are either not present or present, but in insufficient numbers to effectively inoculated the plants. Velvet bean showed no significant differences between inoculated and non-inoculated plants in both height and nodule numbers. However there were a high number of nodules and many were active, suggesting velvet bean in non-specific in its rhizobial requirements and inoculation is not required for this soil.
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