MINISTRY OF EDUCATION
AND TRAINING
MINITRY OF AGRICULTURE
AND RURAL DEVOLOPMENT
VIETNAM ACADEMY OF AGRICULTURAL SCIENCES
VU NGOC QUY
STUDY ON BREEDING
MEDIUM MATURITY MAIZE HYBRID
WITH HIGH YIELD FOR SOUTHEAST REGION
AND CENTRAL HIGHLAND OF VIETNAM
Ranch of study: Genetic – PlantBreeding
Code: 62.62.01.11
SUMMARY OF DOCTORAL THESIS
Hanoi– 2014
This theisis is completed at:
VIETNAM ACADEMY OF AGRYCULTURAL
SCIENCES
Science supervisor:
1. Dr. Mai Xuan Trieu
2. As. Prof. Dr. Nguyen The Hung
Critic 1: ......................................................................
Critic 2: ......................................................................
Critic 3: ......................................................................
The thesis will be defented before Council for
thesis assessment at Institutional level held at
Vietnam Academy of Agricultural Sciences
At ......hour .......minute, day......month......year 2014
This Thesis can be referred to at:
1. National Library
2. Library of Vietnam Academy of Agricultural
Scienses
3. Library of Naional Maize Research Institute
1
INTRODUCTION
1. URGENCY OF THE THESIS
Southeast and Central Highlands are two large commodity
maize producing regions in Vietnam’s southern provinces. In 2012,
the average maize yield in these regions was 5.13 tons/ha, (in which
Southeast region and Central Highlands was 5.62 tons/ha and 4.98
tons/ha), by 119,4% and 103,4% compared with country’s maize
yield (4.30 tons/ha) and the global maize yield (4.98 tons/ha),
respectively.
In order to improve the efficiency of maize production in
Southeast region and Central Highlands through actively supplying
seeds with cheap price, it is essential to implement the thesis “Study
on breeding medium maturity maize hybrids with high yield for
Southeast region and Central Highlands”
2. PURPOSES OF RESEARCH
Breeding and selecting some inbred lines and promissing
crosses for maize breeding and production program in Southeast and
centre Highlands
Breeding new hybrid varieties with medium maturity (90- 96
days), high yield, good quality, suitable to conditions in these
regions..
Determining some cultivation technologies such as plant
density and row spacing, fertilzer doses for new hybrids with the
purpose of introducing and transfering inovative techniques for
farmers in these regions
3. THE PRACTICAL AND THEORETICAL SIGNIFICANCES
3.1.Theoretical significances
Supply additional data, scientific information and the ability
2
to apply the method to selection inbred lines for maize hybrid
breeding.
Implementing scientific data on hybrid maize and cultivation
techniques in ecological conditions of Southeast region and centre
Highlands.
3.2. Practical signficances
8 inbred lines namely IL3, IL4, IL26, IL28, IL50, IL55, IL60
and IL61 are identifed with good charateriesties: well growth and
development, good resistance serving as promissing inbred lines for
the maize breeding program in the SouthEast region and Central
Highlands.
Thesis was identified two maize hybrids LVN68 and DP113
with medium- dated growth duration, well growth and development
ability, good tolerance to unfavorable conditions; for high and stable
yield, adaptation to ecological conditions of Southeast and Central
Highlands.
Identification of suitable planting density of 66,600 plants/
ha with row spacing of 60 cm x 25cm and the optimal dose of
fertilizer of 180N - 80P2O5 - 80 K2O (kg/ha) for maize hybrid
LVN68 in Southeast region and Central Highlands.
4. MATERIALS AND SCOPE OF RESEARCH
4.1. Materials
Inbred lines are developed from different gemplasm
resourses
Hybrids are develpoed from the selected inbred lines.
The suitable cultivation methods are used for promising
hybrid combination.
4.2. The scope of research
3
Conducting field experiments, including experimental
evaluation to select test topcross and dialell hybrids, , breeder testing
(compared to promissing hybrids), VCU tesing; density and dose of
fertilizer experiments..
5. THE NEW CONTRIBUTIONS OF THE THESIS
The thesis was identified 8 inbred lines which have high
combining ability, added to the gemplasm resourses of MRI. The
research also developed two corn hybrids namely LVN68 and
DP113 with suitable plant density and fertilizer doses for
contributing to maize production in Southeast region and central
Highlands.
6. THE THESIS STRUCTURE
The thesis consists of 155 pages, 67 tables, 16 pictures and
photographs: Introduction (3 pages); Chapter 1: Review of literature
(38 pages); Chapter 2: Materials, content and research methods (10
pages ); Chapter 3: Results and discussion (101 pages); Conclusion
(2 pages), References include 163 documents with 51 Vietnamese
documents and 100 English documents and 1 Bulgarian document.
11 wenside documents Three scientific papers related to the thesis
contents have been published in domestic and international scientic
journals.
CHAPTER 1:
LITERANTURE REVIEWS
1.1 THE ROLE OF MAIZE IN THE NATIONAL ECONOMY
Acoording to Ngo Huu Tinh (1997), maize was used as the
main food for 1/3 world population. Maize is the staple food for
people in Southeast Africa, West Africa, South Asia, Central and
South America, etc.
