Evaluation of Selected Rhizobium Strains for Symbiotic Effectiveness on Cowpeas under Tropical African Conditions

概要

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To evaluate the symbiotic effectiveness of selected Rhizobium strains, inoculation trials were conducted in the wet season in 1982 at three locations in West Africa: Samaru in northern Nigeria, Maradi in the Niger Republic and Kamboinse in Burkina Faso. Cowpea cultivar VITA 7, one of IITA's improved cultivars, was grown at each location along with a local check. Five Rhizobium strains collected from locations with diverse geographical conditions in the tropics were used either as four single strain inoculants or a mixture strains of 5 inoculant. Competitiveness of two of the strains, IRc252 and IRc430A, in terms of nodulation on either cultivar was largely dependent on the soil moisture conditions and was very high under adequate moisture conditions. Inoculated plants did not always produce the same nodule mass as uninoculated plants; in some cases they produced considerably less. However, there were no significant differences in the grain yield of each treatment, suggesting that some strains, IRc252 with VITA 7 at Samaru, NUM716 and T242 with the local cultivar at Maradi, and IRc252 and NUM716 with the local cultivar at Kamboinse, are symbiotically more effective than indigenous strains. Indigenous rhizobial strains present in West African soils appeared to be effective enough to induce nodulation in cowpeas and enable to achieve satisfactory grain yield.
日本土壌微生物学会の論文
1987-02-01