VIETNAM NATIONAL UNIVERSITY OF AGRICULTURE FACULTY OF AGRONOMY UNDERGRADUATE THESIS TITLE: THE EFFECTS OF WATERLOGGING AT GERMINATION STAGE ON GROWTH AND YIELD OF SOYBEAN GENOTYPES IN WINTER CROPPING SEASON 2020 Student : Nguyen Thi Hai Yen ID code : 605280 Class : K61KHCTT Instructor : PhD. Nguyen Van Loc Department : Food crop HA NOI - 2021 i COMMITMENT I hereby declare that this is my own research, the data and research results in this report are truthful and have not been used to defend a degree. I hereby certify that all assistance in the implementation of this graduate research project has been thanked and the information cited has been indicated by the origin, name of the author, time of publication. Ha Noi, February 25th, 2021 Student Nguyen Thi Hai Yen ii ACKNOWLEDGEMENTS To complete this thesis, I am deeply indebted to people who have been providing me with precious support and advice. First of all, I would like to express my gratitude to the Dean of the Faculty and the teachers in the Faculty of Agriculture, especially the teachers in the Food Crops subject for facilitating help and having many valuable ideas to help me complete this graduation thesis. Secondly, I would like to send my gratitude to my instructor, Ph.D Nguyen Van Loc, Department of Food Crop, Faculty of Agronomy, Vietnam National University of Agriculture, for their enthusiastic support, helpful advice and considerable encouragement in the completion of my thesis. I would also like to express sincere thanks to M.S Tran Thi Minh Ngoc from Department of Food Crop and all the lectures from Faculty of Agronomy, who taught and created best conditions for students during learning process and research. Last but not the least, I would like to thank my family and my friends who have alwaay beens by my side, give me support and strength to complete this graduattion thesis. I sincerely thank you! Hanoi, February 25th , 2021 Student Nguyen Thi Hai Yen