Land degradation is the principal environmental factor behind declining per capita food production in Sub-Saharan African. Causes include nutrient mining, sol erosion, poor land management and lack of resources. Thus, restoring soil fertility through build up of beneficial soil microbial population can be regarded as valuable coping strategy. Inoculation with rhizobia has the potential to increase dry matter yield, N yield, and residual N levels. However, it is not expected yield responses to inoculation universally in all areas. The response is highly dependent up on several...