Improving Biological Nitrogen Fixation (BNF) by Groundnuts (Arachis hypogea L.) Grown in Acid Soils Amended with Calcitic and Dolomitic Limestones

Abstract: 
Groundnut is an important grain legume in the traditional cropping systems of western Kenya and eastern Uganda. This research focuses on assessing and utilising the biological nitrogen fixation (BNF) potential of groundnut in alleviating soil N deficiencies and achieve enhanced yields in acid under the prevailing acid conditions. Indigenous groundnut rhizobia strains from western Kenya have been characterised in the laboratory and greenhouse. Three promising isolates are under evaluation for symbiotic effectiveness in the field. Preliminary results show that they can raise groundnut and maize yields by 49.1-59.4% and 69.7 - 71.9%, respectively, in limed soil.
L’arachide est une légumineuse à graines importante dans les systèmes de culture traditionnels de l’ouest du Kenya et de l’Est de l’Ouganda. Cette recherche porte sur l’évaluation et l’utilisation du potentiel de fixation biologique de l’azote (BNF) de l’arachide dans la réduction des carences en N dans le sol et l’accomplissement de l’amélioration du rendement en acide dans les conditions acides actuelles. Les souches indigènes de rhizobium des arachidesde l’ouest du Kenya ont été caractérisées au laboratoire et dans la serre. Trois isolats prometteurs sont en cours d’évaluation de l’efficacité symbiotique dans le champ. Les résultats préliminaires montrent cependant qu’ils peuvent remonterles rendements de l’arachide et du maïs de 49,1 à 59,4% et 69,7% à 71,9 dans les solschaulés.
Language: 
Extended abstract under Enhancing Natural Resource Management
Date of publication: 
2012
Country: 
Region Focus: 
East Africa
Collection: 
RUFORUM Conferences and Workshops
Agris Subject Categories: 
Licence conditions: 
Open Access
Form: 
Printed resource
Publisher: 
Notes: 

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.