"On-farm experiments were conducted in farmers’ fields at 12 different sites in the 2 districts of Moshi and Rombo in northern Tanzania during the 2000–01 cropping season to study the effects of (brady)rhizobial inoculation in combination with P supply on growth and grain yields of soybean and common bean, and to assess the economic returns of these different technologies to farmers. A low level of N was included as an indicator of endogenous soil N status.

Soil nutrient depletion in Uganda is one of the leading environmental degradation problems threatening the livelihoods of most farmers in the region. In order to identify policy options that may be used to address the problem, this study was conducted with an objective of analyzing the determinants of flow and balances of nitrogen (N), Phosphorus (P), and Potassium (K) in Uganda. Data for this study were collected from 58 randomly selected farmers who participated in on-farm fertilizer trials and household surveys conducted in 2000 to 2001.