ADDIS ABABA UNIVERSITY SCHOOL OF GRADUATE STUDIES ECONOMIC ANALYSIS OF FARMERS’ PREFERENCES FOR CROP VARIETY TRAITS USING A CHOICE EXPERIMENT APPROACH: LESSONS FOR ON-FARM CONSERVATION AND TECHNOLOGY ADOPTION IN ETHIOPIA BY SINAFIKEH ASRAT FACULTY OF BUSINESS AND ECONOMICS A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN ECONOMICS UNDER NATURAL RESOURCE AND ENVIRONMENTAL ECONOMICS STREAM JANUARY, 2008 ADDIS ABABA