Regional development as an integral past of national development was the basic frame of the developent policy in a typical region in Indonesia. A good regional developent is a change that directed to sustainably increases the social welfare in typical region, in term of economic and ecology “siompu Keprok” citrus (Citrus nobilis, L) was one of leading commodities from Southern Lasalimu to be developed.
This paper reported the land suitability and land potential for developing “Siompu Keprok” citrus in Southern Lasalimu. The data wereobtained using soil survey Method with analytical approach. Intensive observations was made on each land unit sample using purposive sampling technigue. The collected data including land slope, rock type, soil drainge condition, soil color, texture, and structure, flooding and loging potential, errosion, condition of surface rocks, uncovered roks, road usage, efective soil depth, climatic data, and soil chemical properties as total Nitrogen, available P2O5, available K2O, soil pit, soil CEC. The land suitability was evaluate using Matching Method. The results showed that there were four type of actual land suitability as following: S2 (modisatelly suitable), S3 (suitable with condition), N1 (presently not suitable), N2 (permanently not suitable). The restricted factors were: high average yearly temperature (above 300C), longer dry-month (more than 3 months) lack of soil drainase, shallow solumn, basic soil pH, low organic matter content, low phosphorom content, higler land slope (> 25%), higher rock distribution are soil surface (> 25%), uncover rock > 25%, potential errosion high up to modesate. The soil improvement to be done at land unit 3, 4, dan 19-23,48 were amelioration in soil pH by application of sulphus or organic matter, water run-off management to reduce the erroded soil (using appropriate technology) at land unit 12, 24-25, 52; improving soil pH by application of elemental sulphur or organic matter and application phosphorous fertilizer (with medium technology input).