1 FACTORS INFLUENCING ADOPTION OF DROUGHT TOLERANT WHEAT VARIETIES IN THE ARID AND SEMI-ARID LANDS OF NAROK AND KAJIADO DISTRICTS-RIFT VALLEY PROVINCE OF KENYA ALICE CHESAMBU NDIEMA A Thesis Submitted to the Board of Post Graduate of Studies in Fulfillment of the Requirements for the Award of the Degree of Doctor of Philosophy in Agricultural Extension of Egerton University EGERTON UNIVERSITY APRIL 2010