Evaluating the growing, developing and agronomic characteristics of several inbred maize lines in order to select successfully the researched maize family which is early mature and cold endurable, high yield and high combination possibility for maize variety breeding and selecting affairs with cold-endurability and high yield; evaluating the agro-biological characteristics, genetic diversity between lines, creating a hybrid combination with cold-endurability and high yield. | MINISTRY OF EDUCATION MINISTRY OF AGRICULTURE AND TRAINING AND RURAL DEVELOPMENT VIETNAM ACADEMY OF AGRICULTURAL SCIENCES PHAM THANH THUY RESEARCH ON SELECTION OF HIGH-YIELD COLD-TOLERANT HYBRID CORN BREEDING SUITABLE FOR PRODUCTION CONDITIONS IN THE RED RIVER DELTA Ranch of Study Genetic - Plant Breeding Code 96 20 111 SUMMARY OF DOCTORAL THESIS Hanoi - 2021 This theisis is completed at VIETNAM ACADEMY OF AGRICULTURAL SCIENCES Science Supervisor Prof. Dr. Sc. Tran Dinh Long Critic 1 . Critic 2 . The thesis will be defended before the Council for thesis assessment at Institutional-level held at Vietnam Academy of Agricultural Sciences. At .o clock .day month . year 2021 This Thesis can be referred to at 1. National Library of Vietnam 2. Library of Vietnam Academy of Agricultural Sciences 3. Library of Maize Research Institute of Vietnam 1 INTRODUCTION 1. The urgency of thesis Maize Zea mays L. is one of three most important cereal grains which provide food for human and livestock. In addition maize is also a foodstuff crop providing baby maize ear as high-ranking vegetable white maize sweet maize for eating freshly making maize milk and drinks and canned foods. In addition maize also provides material for factories producing food foodstuff pharmaceutical products and light industry especially ideal materials for biological energy. Maize is also the valuable agricultural commodity for export and brings foreign currencies for many countries and territories. Maize was brought into our country about 300 years ago Ngo Huu Tinh 2009 and among food plants maize is ranked in the second position after rice. However the maize yield of our country is still lower than average yield of the world for example In 2013 its average yield was tons ha in comparison with tons ha average yield of world equally to General Statistics Office of Vietnam 2014 In 2018 it reached tons ha in comparison with tons ha equally to General Statistics Office of Vietnam
