MINISTRY OF EDUCATION AND TRAINING MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT VIETNAM ACADEMY OF AGRICULTURAL SCIENCES
----------------------
Maybe you are interested!
-
Research on combining nano additives to enhance the physical and technical properties of natural rubber materials and some of its blends - 2 -
Research on some technical measures for fertilizing Coffea canephora Pierre coffee trees in the business stage on basalt soil in Dak Lak - 25 -
Research on determining varieties and some technical measures to increase productivity and economic efficiency in tomato production in the Red River Delta - 1 -
Research on some technical measures to immediately replant Coffea canephora Pierre var. robusta coffee trees in Dak Lak province - 2 -
Research on growth and development capacity and technical measures to increase productivity and quality of some imported orchid varieties cattleya, dendrobium, oncidium for Northern Vietnam - 33
DOAN VINH PHUC
RESEARCH ON VARIETIES SELECTION AND CULTIVATION TECHNIQUES FOR CORN ( ZEA MAYS L.) ON CONVERTED RICE LAND IN LONG AN AND DONG THAP PROVINCES
DOCTORAL THESIS IN AGRICULTURE
HO CHI MINH CITY – 2021
MINISTRY OF EDUCATION AND TRAINING MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT VIETNAM ACADEMY OF AGRICULTURAL SCIENCES
----------------------
DOAN VINH PHUC
RESEARCH ON VARIETIES SELECTION AND CULTIVATION TECHNIQUES FOR CORN ( ZEA MAYS L.) ON CONVERTED RICE LAND IN LONG AN AND DONG THAP PROVINCES
Major: PLANT SCIENCE Code: 9 62 01 10
DOCTORAL THESIS IN AGRICULTURE
Scientific instructor:
1. Dr. LE QUY KHA
2. Prof. Dr. NGO NGOC HUNG
HO CHI MINH CITY – 2021
COMMITMENT
I hereby certify that the data and research results in the thesis are honest, and part of the results in the thesis have been published in scientific journals with the consent of the co-authors.
I certify that any help received in preparing this thesis and all sources used have been fully acknowledged in this thesis.
Thesis author
ACKNOWLEDGEMENTS
My thesis would not have been completed without the scientific guidance, support and facilitation of many individuals and organizations. I would like to express my sincere gratitude to:
Dr. Le Quy Kha and Prof. Dr. Ngo Ngoc Hung are two scientific supervisors who have enthusiastically instructed me on methods and conducted research; provided many valuable documents during the process of implementing my topic; created conditions for me to attend many conferences and specialized seminars related to agricultural production practices in the Mekong Delta;
The project implementation team of the Southern Institute of Agricultural Science and Technology, including Master Nguyen Thi Phuong Lan, Engineer Le Thi Dao, Master Ho Thi Thanh Sang (Department of Agronomy); Engineers Mai Ba Nghia, Ton Thi Thuy and Vu Hoang Lanh (Center for Research and Transfer of Agricultural Technology Advances) supported me in the process of conducting experiments and collecting field indicators;
Farmers at the experimental sites enthusiastically supported the cultivation and care of the field experiments;
The leaders of the Southern Institute of Agricultural Science and Technology, the experts at the Institute's Office (including the Department of Science Management - International Cooperation and Postgraduate Training and the Administration Department) helped and created all favorable conditions for me to complete my research project;
Dr. Truong Vinh Hai - Deputy Director of the Southern Institute of Agricultural Science and Technology enthusiastically supported and provided professional advice during the process of my thesis;
The leaders of Cuu Long University, the Board of Directors of the Faculty of Agriculture and Aquaculture; Master Pham Van Be Ba, Master Pham Thi My Le supported me a lot with work at the unit so that I could complete my thesis;
My family encouraged, shared, supported me materially and spiritually so that I had enough conditions to research and complete my thesis.
Best regards!
Ho Chi Minh City, February 22, 2022
Author
INDEX
COMMITMENT i
ACKNOWLEDGEMENTS ii
TABLE OF CONTENTS iii
LIST OF TABLES viii
LIST OF FIGURES xii
LIST OF ABBREVIATIONS xiii
INTRODUCTION 1
1. Urgency of the topic 1
2. Objectives of topic 3
3. Scientific and practical significance of topic 4
3.1 Scientific significance 4
3.2 Practical significance 4
4. Research object and scope 5
4.1 Subject 5
4.2 Scope of research 5
5. New contributions of the thesis 5
CHAPTER 1. OVERVIEW OF DOCUMENTS 6
1.1 Corn production and consumption situation and corn development trend 6
1.1.1 Corn production and consumption situation in the world 6
1.1.2 Corn production and consumption situation in Vietnam 7
1.2 Rice - corn farming system in the world and in Vietnam 10
1.2.1 Rice - corn farming system in the world 10
1.2.2 Rice - corn farming system in Vietnam 11
1.3 Biological characteristics of corn 13
1.3.1 Vegetative growth stage 13
1.3.1.1 Germination period 13
1.3.1.2 Seedling period 14
1.3.1.3 The period of growth 14
1.3.1.4 Flowering period 14
1.3.2 Reproductive growth stage 15
1.4 Some research results on N, P, K nutrition on corn plants 15
1.4.1 The role of nitrogen, phosphorus, and potassium nutrients on corn plants 15
1.4.1.1 Nitrogen nutrients (N) 15
1.4.1.2 Phosphorus (P) 16
1.4.1.3 Potassium (K) 16
1.4.2 Some results of biological products research on corn 17
1.4.2.1 Some research results in the world 17
1.4.2.2 Some research results in Vietnam 19
1.5 Some factors affecting corn yield 21
1.5.1 Effects of soil conditions on growth and yield of corn 21
1.5.2 Effect of fertilizer on growth and yield of corn 23
1.5.2.1 Some studies in the world 23
1.5.2.2 Some studies in Vietnam 25
1.5.3 Effect of planting density on growth and yield of corn 27
1.5.3.1 Some studies in the world 27
1.5.3.2 Some studies in Vietnam 29
1.5.4 Impact of pests and weeds on corn yield 30
1.5.4.1 Impact of pests and diseases on corn yield 30
1.5.4.2 Effect of weeds on corn yield 30
1.5.5 Effect of tillage on corn yield 31
1.5.5.1 Some studies in the world 31
1.5.5.2 Some studies in Vietnam 32
1.6 Current status of cultivation and some major obstacles in corn production on rice land in the Mekong Delta 33
1.6.1 Current status of corn cultivation in the Mekong Delta 33
1.6.2 Conversion of corn production on rice land in the Mekong Delta 34
1.6.2.1 Water shortage in dry season due to climate change 34
1.6.2.2 Domestic demand for corn grain increases rapidly 35
1.6.2.3 Trade conflict between the US and China 35
1.6.3 Some obstacles to corn cultivation on rice land in the Mekong Delta ..36 1.6.3.1 Seed work 37
1.6.3.2 Fertilizer use efficiency 39
1.6.3.3 Technical measures 39
1.6.3.4 Disease control 39
1.6.3.5 Mechanization in production 40
1.6.3.6 Domestic corn consumption market 40
1.7. Characteristics of the study sub-region 41
1.7.1 Natural features of Long An province 41
1.7.2 Natural features of Dong Thap province 43
CHAPTER 2. MATERIALS, CONTENT AND RESEARCH METHODS .48 2.1 Research materials and means 48
2.2 Research content 50
2.3 Research methods and monitoring of indicators 51
2.3.1 Research method for selecting domestic hybrid corn varieties suitable for ecological conditions on converted rice land in Dong Thap and Long An 51
2.3.1 Research method on some cultivation techniques for hybrid corn varieties on converted rice land in the Mekong Delta. 55
2.3.2.1 Soil engineering experiment 55
2.3.2.2 Experiment to evaluate the effectiveness of fertilizer use for hybrid corn on converted rice land 57
2.3.2.3 Experiment to determine appropriate nitrogen fertilizer dosage and planting density 59
2.3.2.4 Study on the effectiveness of biological products and slow-release fertilizers on corn plants 61
2.3.3 Method of building a corn cultivation model on converted rice land in ecological sub-regions in Long An and Dong Thap. 62
2.3.3.1 Evaluation of production efficiency of promising hybrid corn varieties applying synchronous technical measures 62
2.3.3.2 Evaluating the effectiveness of conversion farming models in local production structure 63
2.3 Data processing 64
CHAPTER 3. RESULTS AND DISCUSSION 65
3.1 Results of selecting suitable corn varieties for cultivation on rice fields in the Mekong Delta 65
3.1.1.1 Growth characteristics of selected corn varieties 65
3.1.1.2 Morphological characteristics of selected corn varieties 69
3.1.1.3 Level of pest and disease infection 72
3.1.1.4 Leaf durability, plant condition and ear condition 75
3.1.1.5 Yield of selected hybrid corn varieties in Long An and Dong Thap 79
3.2 Developing some cultivation techniques for hybrid corn variety MN585 on converted rice land in the Mekong Delta 92
3.2.1 Determining suitable land preparation methods for corn cultivation on converted rice land 92
3.2.1.1 Effect of tillage method on plant height and ear height 92
3.2.1.2 Effect of tillage method on tree death and tree fall rate 93
3.2.1.3 Effect of tillage method on corn yield 95
3.2.2 Experiment to evaluate the effectiveness of fertilizer use for hybrid corn on converted rice land 97
3.2.2.1 Corn yield through fertilizer treatments 97
3.2.2.2 Agronomic effects of nitrogen, phosphorus and potassium on hybrid corn MN585 99
3.2.3 Determining appropriate nitrogen dosage and density for selected hybrid corn varieties on converted rice land in the Mekong Delta 101
3.2.3.1 Effect of nitrogen dose and planting density on growth of corn 101