Biological Nitrogen Fixation and Sustainability of Tropical Agriculture, edited by K. Mulongoy, M. Gueye and D.S.C. Spencer

Biological Nitrogen Fixation and Sustainability of Tropical Agriculture
edited by K. Mulongoy

Biological nitrogen fixation is the procedure used by microorganisms living in the soil or in symbiosis with plants to tap atmospheric nitrogen and reverse or reduce soil degradation. Comprised of nitrogen fixing systems, biotechnological developments and attempts to model the effects of mycorhizal inoculation of crops on soil nitrogen content, the socioeconomic impact of nitrogen fixation and sustainability of nitrogen-fixing cropping systems.

This book contains the proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria.

Contents

Biological nitrogen fixation in tropecal agrosystems: Twenty years of biological nitrogen fixation research in Africa.

Sustainable agriculture: Definition and measurement.

NITROGEN-FIXING SYSTEMS

Biological nitrogen fixation systems in tropical ecosystems: An overview
A protocol for screening legumes as soil-improving crops
The sustenance of tropical agriculture with multipurpose
Facteurs p�doclimatiques limitant la fixation biologique de l'azote chez les l�gumineuses
Response of some tropical nitrogen-fixing woody legumes to drought and inoculation with mycorrhiza
Improvement of the Phaseolus/Rhizobium symbiosis, with particular reference to the Caribbean region
Effect of pest management systems on biological nitrogen fixation
Effect of Rhizobium inoculation and phosphorus on growth and nitrogen fixation in tree legumes grown on highland Vertisols
Management of soil microbial populations to optimize tree establishment and growth, with particular reference to nitrogen-fixing bacteria
Agronomic evaluation of a rock phosphate as a phosphorus source for Leucaena leucocephala grown on an Ultisol
Early growth and symbiotic properties of three woody legumes grown on a sandy soil in south-western Nigeria
Response of soybean to inoculation with Bradyrhizobium japonicum in the northern Guinea savanna of Nigeria
Nodulation of soybean grown under field conditions and inoculated with Bradyrhizobium japonicum strains
Effect of fertilization and Rhizobium inoculation on the growth of Leucaena and Gliricidia on an Alfisol in south-western Nigeria
Early growth and nodulation in Leucaena and Gliricidia and the effects of pruning on biomass productivity
Comparative study on the growth and productivity of Sesbania and Leucaena in the Central Plateau region, Rwanda

BIOTECHNOLOGY AND MODELLING IN NITROGEN FIXATION

Supernodulation and non-nodulation mutants of soybean
Croissance des racines adventives de Sesbania rostrata: Application à la multiplication v�g�tative de la plante
Genetically improved rhizobia and their use in agriculture
Adaptation of more efficient soybean and cowpea rhizobia to replace established populations
Predicting the persistence of introuced Bradyrhizobium japonicum in tropical soils
Useful models to predict response to legume inoculation

MEASUREMENT AND SOCIOECONOMIC IMPACT OF NITROGEN FIXATION

Estimation of biological nitrogen fixation by three legume tree species using the ¹⁵N dilution method
Estimating nitrogen fixation in Leucaena and Gliricidia using different ¹⁵N labelling methods
Measuring nitrogen fixed by groundnut varieties in Senegal using ¹⁵N techniques
Effect of Rhizobium and Rhizobium/Glomus inoculation on nitrogen fixation in bambara groundnut
Selection of soybean cultivars for a mixed cropping system in Nigeria using the ¹⁵N dilution technique
Measuring inputs from nitrogen fixation in multiple cropping systems
Estimation of symbiotically fixed nitrogen using extended N difference methods
The economics of using legumes in cropping systems
An exploratory survey of soybean production in Ayepe, Nigeria
Inoculation des l�gumineuses en milieu tropical: Recherche, d�veloppement et aspectséconomiques

SUSTAINABILITY OF NITROGEN-FIXING CROPPING SYSTEMS

Nodulation and nitrogen fixation and transfer in a cowpea/rice cropping system
The role of legumes in sustaining soil productivity and controlling soil erosion
Nitrogen contribution of woody legumes in alley cropping systems
L'azote dans les syst�mes de culture du nord et du centre de la C�te d'Ivoire
Fitting soil-improving legumes into inland valley rice-based cropping systems in West Africa
Five years of research on improved fallow in the semi-arid highlands of Rwanda
Use of legume biological nitrogen fixation in crop/livestock production systems
R�le de la fixation de l'azote par l'arachide dans l'am�lioration durable de la fertilit� azot�e d'un sol sableaux tropical par l'amendement calcique et organique
Utilisation de Sesbania rostrata et Crotalaria juncea comme engrais verts sur le ma�s
Herbage yield and soil fertililty restoration potential of some tropical forage legumes
Effect of fallow and residue management practices on biomass production, weed suppression and soil productivity

Conference Summary and Recommendations
Authors and Conference Participants
Acronyms

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Biological Nitrogen Fixation and Sustainability of Tropical Agriculture
edited by K. Mulongoy
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