Abstract
Slash-and-burn (SB) agriculture degrades soil and reduces fertility, but provides most of the food produced in tropical Africa. Soil biota can be manipulated to enhance soil nutrient availability and fertility, and to improve plant tolerance to stress and diseases. The potential of beneficial micro-organisms (BM) such as mycorrhizal fungi (MF), legume-nodulating bacteria (LNB), phosphorous-solubilizing micro-organisms (PSM), and bio-control agents for sustaining agricultural productivity was assessed in land-use systems (forest, plantation, fallow and mixed farm) from humid forest ecosystem. Microbial activity is significantly influenced by cropping practices. Inoculation of legumes by selected LNB and of garden crops, cereals, legumes, tubers, and fruit trees by arbuscular MF can increase crop yield or growth by 50%–200%. Yield improvement by BM was more pronounced in low microbial activity soils. BM has proved to be equivalent to or better than some inorganic fertilizers in Ferralsols. An integrated soil fertility management system involving organic/inorganic nutrients additions, more BM, and socio-economics is suggested as an alternative to SB agriculture.
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- AABNF:
-
African Association for Biological Nitrogen Fixation
- AGRA:
-
Alliance for a Green Revolution in Africa
- AfNet-TSBF:
-
African Network for Soil Biology and Fertility Institute
- Africa NUANCES:
-
Africa Nutrient Use in Animal and Cropping Systems: Efficiencies and Scales
- AM:
-
Arbuscular mycorrhiza
- AUF:
-
Agence Universitaire de la Francophonie
- ASB:
-
Alternatives to Slash-and-Burn Program
- BIOVEG:
-
Biotechnologie végétale: amélioration des plantes et sécurité alimentaire
- BCA:
-
Bio-control agents
- BM:
-
Beneficial micro-organisms
- CARBAP:
-
Centre Africain de Recherche sur Bananiers et Plantains
- CFU:
-
Colony forming units
- CIAT:
-
International center for Tropical Agriculture
- CSM-BGBD:
-
Conservation and sustainable management of below ground biodiversity
- EM:
-
Ectomycorrhiza
- EMBRAPA:
-
Empresa Brasileira de Pesquisa Agropecuária
- ETH:
-
Swiss Federal Institute of Technology
- FAO:
-
United Nations Food and Agriculture Organisation
- ICRAF:
-
International Centre for Research in Agroforestry
- IFDC:
-
International Fertilizer Development Center
- IITA:
-
International Institute for Tropical Agriculture
- IRD:
-
Institut Français de Recherches pour le Développement
- IRAD:
-
Institute for Research on Agriculture for Development
- ISFM:
-
Integrated soil fertility management
- LNB:
-
Legume-nodulating bacteria
- LSTM:
-
Laboratoire des Symbioses Tropicales et Méditerranéennes
- MINESUP:
-
Ministry of Higher Education
- MINEP:
-
Ministry of Environment and Protection of Nature
- MF:
-
Mycorrhizal fungi
- MIRCEN:
-
Microbial Resources Centre
- NARS:
-
National Agricultural Research System
- PGPR:
-
Plant growth-promoting rhizobacteria
- PSM:
-
Phosphorus-solubilizing micro-organisms
- SB:
-
Slash-and-burn
- SOM:
-
Soil organic matter
- SS:
-
Sub-Saharan
- TSBF:
-
Tropical Soil Biology and Fertility Institute
- UNESCO-BAC:
-
UNESCO Biotechnology Action Council
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Acknowledgments
We thank AfNet-TSBF Institute of CIAT (Nairobi, Kenya), AfricaNUANCES Project (Wageningen, Netherlands), AUF “Bioveg” Network (Paris, France), AGRA Soil Health Project (Accra, Ghana), students and colleagues in Cameroon (CARBAP, ICRAF, IITA-Nkolbisson, IRAD, IRD-Yaoundé, MINEP, MINESUP, Universities of Yaoundé I, Ngaoundéré, Buea, Douala, Dschang) and IITA (Ibadan, Nigeria and Cotonou, Benin), University of Cheik Anta Diop (Dakar, Senegal), EMBRAPA (Seropedica, Brazil), ETH Institute of Plant Science (Zurich, Switzerland), LSTM IRD (Montpellier, France), Universities of Dundee and York (Plant Biology Dept, UK), Institute of Soil Science and Plant Nutrition, Martin-Luther University (Halle-Wittenberg, Germany) for their collaboration, work and networking. We also thank UNESCO Biotechnology Action Plan for a memorable training scholarship in Brazil (EMBRAPA-RJ).
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Nwaga, D., Jansa, J., Angue, M.A., Frossard, E. (2010). The Potential of Soil Beneficial Micro-Organisms for Slash-and-Burn Agriculture in the Humid Forest Zone of Sub-Saharan Africa. In: Dion, P. (eds) Soil Biology and Agriculture in the Tropics. Soil Biology, vol 21. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05076-3_5
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