Savanna Institute: Agroforestry for Climate-Resilient Farming

This 2023 peer-reviewed study from the Savanna Agricultural Research Institute examines alley cropping and Faidherbia albida integration in West African smallholder farms, based on 150+ farmer trials over 7 years. Methods involved planting Faidherbia trees (nitrogen-fixing, drought-tolerant) at 100-200 trees/ha in maize alleys, with 4-6m spacing to optimize light penetration. Key findings show 25-40% maize yield increases due to improved soil fertility (N fixation adding 50-100kg N/ha/year) and microclimate moderation. Soil carbon sequestration reached 2.1 t/ha/year, measured via eddy covariance and soil sampling, enhancing long-term resilience. Drought metrics during 2018-2022 Sahel dry spells demonstrated 35% less crop failure in agroforestry plots vs. monocultures, attributed to tree litter mulching and deeper roots accessing groundwater. Practical implementation details include farmer training on pruning (annual lopping to 2m height for fodder), intercropping rotations (maize-sorghum-cowpea), and pest control via push-pull habits (desmodium repels stem borers). Economic analysis reports $450-700/ha net gains from combined yields and tree products (pods, fodder). Adaptive strategies for scaling: start with 0.5ha demonstrations, integrate livestock for manure cycling. The study provides data tables on biomass accumulation (15 t/ha dry matter by Year 5), nutrient budgets, and resilience indices, offering concrete evidence for smallholders to adopt agroforestry amid climate variability. Insights extend to policy recommendations for subsidies on seedlings and extension services, positioning this as a model for regenerative agroforestry in semi-arid tropics.