Soil erosion is one of the most devastating problems in the upper watershed areas in Sri Lanka. Erosion-prone cultivation of vegetables (especially potatoes) on steep slopes, without soil conservation measures, has become a major problem in the recent past. Soil erosion has significant impacts on on-farm as well as off-farm activities. Although various institutions have launched programs to introduce soil conservation techniques, these have not yielded expected results mainly due to a lack of understanding of the potato farmers' behavior on investment decisions on soil conservation. Hence the conceptual model on investment decisions on soil conservation was tested in this paper. The analytical results of the generalized least square model indicated the importance of personal and economic, as well as institutional, factors in decision-making in soil conservation. Therefore, obtaining farmer adoption of erosion-control practices will require the use of various implementation tools such as education, subsidies, and technical assistance. Low willingness to invest in soil conservation indicated the necessity for public installation of conservation structures if they are to be widely used in potato farmlands in the upper watersheds in Sri Lanka. (C) 2004 Elsevier Ltd. All rights reserved.
