THESIS ESTIMATING FARMERS’ WILLINGNESS TO PAY FOR IMPROVED IRRIGATION: AN ECONOMIC STUDY OF THE BONTANGA IRRIGATION SCHEME IN NORTHERN GHANA Submitted by Mustapha Alhassan Department of Agricultural and Resource Economics In partial fulfillment of the requirements For the Degree of Master of Science Colorado State University Fort Collins, Colorado Fall 2012 Master’s Committee: Advisor: Marshall Frasier Co-Advisor: John Loomis Stephen Davies Allan Andales