Diversity and Symbiotic Effectiveness of Acid Tolerant Groundnut Rhizobia inWestern Kenya Soils

This study was carried out to find suitable strains of rhizobia for use in ground nut production under acid-aluminium soils. Thirty-six rhizobia isolates tolerant to high soil aluminium were identified.. The isolates were gram negative rod cells that reduced nitrate to nitrite, urea to ammonia and utilized citrate. Three isolates A6w, W1w and V2w were selected as the most promising for efficient Biological Nitrogen Fixation (BNF) in groundnut. Upon testing them for symbiotic effectiveness on a groundnut monocrop, V2w and A6w had the best performance compared to Biofix, a commercial strain. These two have been converted to a bio-fertilizer form that is under trial by farmers.
Cette étude a été menée pour trouver des souches appropriées de rhizobiums pour une utilisation dans la production des arachides dans les sols acide- aluminium. Trente-six isolats des rhizobiums tolérants à la grande teneur en aluminium dans le sol ont été identifiés. Les isolats étaient des cellules en bâtonnets Gram-négatives qui ont réduit les nitrates en nitrites, l’urée en ammoniac et ont utilisé le citrate. Trois isolats A6W, W1w et V2W ont été choisis comme les plus prometteurs pour la fixation de l’azote biologique efficace (BNF) dans les arachides. En les testant pour l’efficacité symbiotique sur une monoculture des arachides, V2W et A6W ont eu la meilleure performance par rapport à Biofix, une souche commerciale. Ces deux ont été convertis en une forme de bio-engrais qui est à l’essai par les agriculteurs.
Extended abstract under Enhancing Natural Resource Management
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East Africa
RUFORUM Conferences and Workshops
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Open Access
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The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholders in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants. This record contains an extended abstract accepted under the theme of Enhancing Natural Resource Management.