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This study was conducted in the
ecological farm of the University of Tropical
Agriculture Foundation (UTAF) from May to October 2002. The study was
financially supported by the Swedish Agency for Research Cooperation with
Developing countries (SAREC), presently a part of the Swedish International
Development Authority (sida). Without their support I
would not have accomplished my study. I wish to express my sincere thanks to
all.
I would like to express
special thanks to Dr Inger Ledin,
the head of the department of
I am deeply indebted to my
supervisor, Dr. T R Preston, Director of the University of
Tropical Agriculture (UTA), for patient guidance and encouragement and allowing
the use of the ecological farm and laboratory facilities throughout this study.
I also would like to express my sincere thanks to Dr.