Improving biological nitrogen fixation (BNF) by groundnuts grown in acid soils through amendment with calcitic and dolomitic limestones

Groundnut (Arachis hypogeal L.) is an oil crop legume capable of symbiotic nitrogen fixation. Soil acidity is a major limitation to symbiotic nitrogen fixation. Acid soils are widespread in Western Kenya and Eastern Uganda where groundnut is an important crop. This study seeks to isolate and characterize indigenous rhizobia capable of nodulating groundnut from the region and establish the best soil conditions under which their N-fixing efficiency is enhanced. The native strains will be compared to commercial rhizobium inoculants specific to groundnuts for their effectiveness. The project is envisaged to increase groundnut yields (to 2-3 t ha-1) in the depleted acidic soils of western Kenya and eastern Uganda through the use of BNF technology.
L’arachide (Arachis hypogeal L.) est une plante légumineuse riche en huile capable de fixer l’azote symbiotique. L’acidité du sol est une limitation importante à la fixation de l’azote symbiotique. Les sols acides sont répandus au Kenya occidental et en Ouganda oriental où l’arachide est une culture importante. Cette étude cherche à isoler et caractériser le rhizobium indigène capable de noduler l’arachide de la région et à établir les meilleurs conditions du sol dans lesquelles leur efficacité de fixation de N est améliorée. Les contraintes indigènes seront comparées aux inoculants commerciaux de rhizobiums spécifiques aux arachides pour leur efficacité. Le projet est envisagé pour augmenter des rendements d’arachide (à 2-3 t ha-1) dans les sols acides épuisés du Kenya occidental et de l’Ouganda oriental par l’utilisation de la technologie de BNF.
Date of publication: 
Region Focus: 
East Africa
RUFORUM Conferences and Workshops
Licence conditions: 
Open Access
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Printed resource

About the RUFORUM 2010 Biennal Conference
"The 2010 RUFORUM Biennial Conference was the second 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. This record contains an extended abstract accepted under the theme of Natural Resource Management"