Perspectives on soil fertility change: a case study from southern Ethiopia

This paper explores the complexities underlying the apparently simple question—Is soil fertility declining?—for Wolayta in southern Ethiopia, an area famed for its high population densities and extreme pressure on resources. Drawing on extensive field research in the area, the paper examines differing perceptions of soil fertility decline, and attempts to pick apart the range of evidence of changes in soil fertility over time from a variety of different sources, ranging from historical interviews with farmers to fertilizer trials carried out over many years. In contrast to the definitive statements so often made in development policy statements, the actual situation is much less clear. A detailed understanding of soil fertility dynamics is only reached by a farm and field level examination of soil nutrient balances. Differences according to agroecological zone and socio-economic group are evaluated. These results show that soil fertility is indeed declining in some places, for some people and over certain periods, but it is not universal. Indeed, soil fertility is apparently increasing at certain sites. The implications of such findings for development policy and practice are briefly explored.