INFLUENCE OF SOYBEAN GENOTYPE AND RHIZOBIAL INOCULATION ON SOYBEAN NODULATION, YIELD AND YIELD COMPONENT IN MINNA, SOUTHERN GUINEA SAVANNA OF NIGERIA

Adekanmbi A. A., Afolabi S. G., Adeboye M. K. A., Bala A.

Abstract


Promiscuous Soybean (Glycine max) varieties of the TGx types are known to nodulate and fix nitrogen with indigenous rhizobial populations in soils of most parts of Nigeria. The response of these varieties to rhizobial inoculation is, however, unclear. Therefore, a field study was conducted to assess the response of five genotypes of TGx soybean to inoculation. The experiment was a 2 x 5 factorial replicated three times and fitted into a Complete Randomized Block Design (RCBD), comprising five genotypes (varieties) (TGx1448-2E, TGx1904-6F, TGx1955-4F, TGx1935-3F and TGx1951-3F), two levels of inoculation (Inoculated and Uninoculated). Inoculation significantly increased nodule number, shoot biomass, and grain yield, but delayed pod production. An increase of 26.6% in nodule number, 20.7% in grain yield and 19.4% in shoot biomass due to rhizobial inoculation was evidenced. Among genotypes, TGx1955-4F had the most numerous nodules, while TGx1448-2E and TGx1951-3F had the fewest. TGx1951-3F and TGx1955-4F produced pods earlier than TGx 1935-3F with TGx1904-6F, taking longest time to pod. However, TGx1935-3F, along with TGx1951-3F, produced the heaviest grains. There were no significant interactions between variety and inoculation in all the parameters measured suggesting the possibility of soybean response to inoculation irrespective of genotype.

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