a case study in Northeast Thailand Gicana, Dolores Mae N. creator Jayasuriya, H.P.W. Chairperson Salokhe, Vilas M. Examination Committee Shivakoti, Ganesh P. Examination Committee Rungsun Im-Erb Examination committee Protected Cultiv ation Project Scholarship donor Asain Institute of Technology Fellowship Scholarship donor text series technical report th Pathum Thani, Thailand Asian Institute of Technology 2008 continuing eng 138 p. : ill. A survey of farms with and without farm ponds in integrated crop{u2013}aquaculture sub-systems was undertaken in three study sites in Khon Kaen, Kalasin and Maha Sarkham in the Northeast of Thailand, a region known as one of the typical rain-fed rice areas with tropical wet: dry climate. Concrete evidence in the effectiveness of the farm ponds in the Northeast of Thailand has been presented. The case of the NE clearly indicates the development of rainfed into ir rigated landscape, improvement of the seasonal yield, the various sub-systems that can be derived leading to profitability and sustainability in the farm. The size of farm ponds in the three sites was estimated to be significantly smaller but has been considered by the farmers to have significantly changed their farming options. Increasing the size of the farm pond allows shifting from nearly total rice sub- system to a kind of vegetable sub-system following the different existing crop combination and aquaculture to attain the maximum profit during the wet and dry seasons. Results from the LP model obtained for four options proposed were compared with existing systems revealed that feasibility for significant increase in farm net income; maximum being the Option-1 in medium farm (supplementary feeding) with baht 1,840,183 increased from baht 134,931, and Op tion-1 in small farm baht 596,022 increased from 65,428. Findings of the optimum farm pond size and best combination of sub-system through water balance simulation and LP models helped to identify which is profitable as well sustainable. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Agricultural Systems and Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 2008 Farm ponds Thailand Northeast Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B01723 http://203.159.5.9/ait-thesis/detail.php?q=B01723 090708 20260818170824.0