Summary of agricultural doctoral thesis: Studying the growth, development capacities and technical measures to increase yields, qualities of some exotic orchid cultivars (cattleya, dendrobium, oncidium) for Northern Vietnam

The purpose of this research subject is to study the growth, development of some exotic hybrid orchid genera of Cattleya, Dendrobium, Oncidium in order to select new promising hybrid orchid cultivars, consistent with the Northern Delta region and the nearby region with similar ecological conditions.
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Summary of agricultural doctoral thesis: Studying the growth, development capacities and technical measures to increase yields, qualities of some exotic orchid cultivars (cattleya, dendrobium, oncidium) for Northern Vietnam MINISTRY OF EDUCATION MINISTRY OF AGRICULTURE AND TRAINING AND RURAL DEVELOPMENT VIETNAM ACADEMY OF AGRICULTURAL SCIENCES HOANG XUAN LAMSTUDYING THE GROWTH, DEVELOPMENT CAPACITIES ANDTECHNICAL MEASURES TO INCREASE YIELDS, QUALITIES OFSOME EXOTIC ORCHID CULTIVARS (CATTLEYA, DENDROBIUM, ONCIDIUM) FOR NORTHERN VIETNAM Branch of study: Crop science Code : 62 62 01 10 SUMMARY OF AGRICULTURAL DOCTORAL THESIS HANOI - 2014Project completed at: VIETNAM ACADEMY OF AGRICULTURAL SCIENCESScientific supervisors: 1. Ass. Prof .Dr. Nguyen Thi Kim Ly 2. Prof. Dr. Nguyen Xuan LinhCritic 1:Critic 2:Critic 3:The thesis is defended at Council for Thesis Assessment at University/Institutional level, held at: Vietnam Academy of Agricultural Sciences At hours, day month yearThis thesis can be referred to at: - Vietnam National Labrary - The Libray of Vietnam Academy of Agricultural Sciences 1 INTRODUCTION 1. Urgency of research topic Of all popularly planted types of flowers, orchids are known as a flower notonly beautiful, fragrant, multi – colorful, but also are of high economic value. So far,mankinds have learned on more than 750 orchid branches with 35000 wild orchidsspecies and 75000 orchid cultivars as a result of selection and breeding [33]. In Vietnam, there are about 1003 species of orchids available [ 33 ]. Theseare very abundant plant resources to serve the creatation and breeding of newvarieties of orchids. However, most of these orchids can only be exploited andcultivated in natural conditions, technical measures have not yet been applied, sotheir yields and qualities are not high that can not meet the requirements ofconsumers. Whereas the exotic orchids have their advantages as having goodgrowth and healthy development, high yields , good quality of flowers: big flowers,beautiful colors, various diversified, durable and long -lasting flowers and that theirflower blooming time can be controlled for the occasions of Holidays or LunarNew Year Celebration, that has brought about high economic efficiency to growers. Cattleya, Dendrobium, Oncidium are pretty orchids species popularlyesteemed by the markets. It is attractive to consumers with diversified colors,beguiling aroma and especially, commercial producers are attracted by thedurability of flowers. However, the actual production of these orchids in Vietnamstill faces many difficulties. Lan Cattleya, Dendrobium , Oncidium orchids are verysuitable the climate in Southern areas as of its all - year-round warm weather, greatsun radiation and long appropriate sunlight for plant to grow and develop, whereasthe climatic condition in the North is not favorable due to high summertemperatures (33 - 380C), high humidity and high sunlight intensity that causes anegative impact to the growth of the plants, making the plants susceptible to leafblight, high percentage to rotten disease prevalence. In Winter, the temperatures istoo low, weak sunlight intensity, short sunlight during the days are also notfavorable for plant growth , development and giving flowers. On the other hand, asfor lack of good seeds, technical inconsistency and inappropriate caring process ...the production cuold not bring about high efficiency, quantity and quality oforchids still can not meet consumer requirements, while the demand for the abovementioned orchids is very high. In order to overcome this limitation, enabling plantorchids in general and Cattleya, Dendrobium and Oncidium orchids in particular to 2develop to be effective, the research subject Studying the growth, developmentand technical measures to increase productivity, quality of exotic orchid varieties(Cattleya , Dendrobium , Oncidium ) for Northern Vietnam . 2. The purpose and requirements of the subject 2.1. Purpose - The purpose of this research subject is to study the growth, development ofsome exotic hybrid orchid genera of Cattleya, Dendrobium, Oncidium in order toselect new promising hybrid orchid cultivars, consistent with the Northern Deltaregion and the nearby region with similar ecological conditions. - To determine the impact of growing conditions and technical factors to thegrowth, development, flowering of some exotic hybrid orchid genera as Cattleya,Dendrobium, Oncidium and to propose a ...