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I would like to express my sincere gratitude to:
Dr. Thomas Reg Preston, my main supervisor, for all your irreplaceable help and inspiration and for your correcting, commenting, advising and discussion throughout the study.
Prof. Dr.Leng R A, for reading, correcting and commenting the English in my papers.
Prof. Dr. Luu Trong Hieu, former Co-ordinator, Dr. Ngo Van Man, Co-ordinator of the SAREC-MEKARN project and the staff of Sida-SAREC regional office in NLU, especially Mr. Nguyen Van Cong, for advice, social activities and for their warm welcome and providing suitable conditions for the study.
Dr. Bounthong Buahom, Director of National Agriculture and Forestry Research Institution of Laos, Mr. Thongly Xayachack, Dean and Mr. Fongsamouth Southammavong, Vice Dean of the Faculty of Agriculture, National University of Laos, for their help, facilitation and encouragement.
Professors, lecturers and assistant lecturers in courses, for supplying useful knowledge.
All of my friends in the MSc course from the four countries: Laos, Vietnam, Cambodia and Thailand, for sharing the culture, friendship and creating a warm atmosphere throughout the time of the course.
My parents, my brothers, my sister and all my special friends in Laos, for all of their support and inspiration during my study. Many thanks for believing in me.