Results/Conclusions . Systems with enhanced biodiversity were associated with improved (16 to 50%) nitrogen efficiency. Farmer preference was for legume-diversified ‘rotation Plus’ systems (41 - 56%), compared to monoculture maize (6 to 8%). Farmer evaluation was consistent with economic assessment as the variable cost ratio of ‘rotation Plus’ systems was two-fold higher (6.9-7.9) than monoculture maize (4.8-5.4). Overall, biodiversity combined with integrated nutrient management provided a basis for food security and protection of resources, in an increasing variable environment.