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The author is very grateful to the Swedish International Development Cooperation Agency (Sida)/ Department for Research Cooperation with Developing Countries (SAREC) for funding this thesis research and the scholarship for the MSc degree.
I would like to express my deep gratitude to Dr Ngo Van Man, my supervisor, Dr Martin Melin and Mr.Vo Lam, who helped me with valuable advice, corrections and criticism, which made it possible to accomplish this work.
I also wish to express my sincere gratitude to: Professors and lecturers of this course who gave me their useful knowledge and technical assistance. Prof. Dr. Brian Ogle, International Coordinator of the Project, Course Director of the MSc. Programme for valuable support, especially in correction of my English.
Dr. Luu Trong Hieu, Mr. Nguyen Van Cong, Dr Duong Nguyen Khang (NongLam University), Prof. Vo Tong Xuan, and Mr. Vo Tong Anh, (Angiang University) who gave me the opportunity and encouraged me during this course.
My colleagues at the Agriculture and Natural Resources and Research and Rural Development Center of Angiang University, who encouraged and assisted me during the course, especially Ms Bui Phan Thu Hang and Ms Nguyen Thi Ngoc Giang, for their great help in the laboratory analyses, and Mr Tri, Tho, Lam in the survey and the research.
The officers of the Agriculture and Rural Development Department of district No 12 and Cu Chi district for providing information and the farmers in these districts, who cooperated and assisted me in carrying out this research.
My classmates on the MSc. course from Vietnam, Cambodia, Laos and Thailand, for their friendship.
My family for their love, encouragement and support to me, particularly, my wife Le Thi Thuy and my lovely son, Nguyen The Quang Thien, who encouraged, helped, inspired me during the course.