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- Communicating complexity: Integrated assessment of trade-offs concerning soil fertility management within African farming systems to support innovation and development. Agricultural Systems. 104:191-203. 2011
- Communicating complexity: Integrated assessment of trade-offs concerning soil fertility management within African farming systems to support innovation and development. Agricultural Systems. 104:191-203. 2011
- Variable responses of the depth of tree nitrogen uptake to pruning and competition.. Tree Physiology. 26:1529-1535. 2006
- Exploring diversity in soil fertility management of smallholder farms in western Kenya - I. Heterogeneity at region and farm scale. AGRICULTURE ECOSYSTEMS & ENVIRONMENT. 110:149-165. 2005
- Root distributions partially explain N-15 uptake patterns in Gliricidia and Peltophorum hedgerow intercropping systems. Plant and Soil. 235:167-179. 2001
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- Nitrogen cycling efficiencies through resource-poor African crop-livestock systems. AGRICULTURE ECOSYSTEMS & ENVIRONMENT. 261-282. 2006