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Discussion Paper Series No. 2001-01

2001

constitutes studies that are preliminary and subject to further revisions. They are be-ing circulated in a limited number of cop-ies only for purposes of soliciting com-ments and suggestions for further refine-ments. The studies under the Series are unedited and unreviewed. The views and opinions expressed are those of the author(s) and do not neces-sarily reflect those of the Institute. Not for quotation without permission from the author(s) and the Institute.

Discussion Paper Series No. 2001-05

2001

constitutes studies that are preliminary and subject to further revisions. They are be-ing circulated in a limited number of cop-ies only for purposes of soliciting com-ments and suggestions for further refine-ments. The studies under the Series are unedited and unreviewed. The views and opinions expressed are those of the author(s) and do not neces-sarily reflect those of the Institute. Not for quotation without permission from the author(s) and the Institute.

This thesis has been submitted with our approval as the University supervisors

2002

Albrecht for their useful support, ideas and constructive criticism. Further, I would like to specifically thank Dr. Albrecht for catering for my accommodation during the fieldwork. I am also indebted to Anja Boye of ICRAF, Maseno, for the ORSTOM simulator photographs and her assistance during the fieldwork; Moses for the administrative roles; the rainfall simulation team-Mango, Osanya, Caleb, and Justus for agreeing to work during odd hours including weekends to ensure that the work was completed in time. I also extend my thanks to colleagues at the department; Nduta, Wamboi, Moindi, Kage, Kip, Kihara and fellow students at ICRAF-Gunga, Kandji, and Mutuo for their encouragement and moral support. To my parents, brothers, sisters and my friend Angela Akumu who made great sacrifices that enabled me finish this work; I say a big thank you. To you I did not mention, you too contributed to the success of the study.