Dissertation for doctor of philosophy in agriculture: Studying on some techniques to develop daisy flower production in Thai Nguyen city

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Research objectives: Selecting some daisy flower varieties that have high yield, good resistance and are suitable with the ecological conditions for developing flower production in Thai Nguyen and surrounding areas. Identifying some appropriate techniques to develop daisy flowers in Thai Nguyen.

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Nội dung Text: Dissertation for doctor of philosophy in agriculture: Studying on some techniques to develop daisy flower production in Thai Nguyen city

MINISTRY OF EDUCATION AND TRAINING THAI NGUYEN UNIVERSITY NGA THI TO DANG STUDYING ON SOME TECHNIQUES TO DEVELOP DAISY FLOWER PRODUCTION IN THAI NGUYEN CITY Major: AGRONOMY Code: 62 62 01 01 DISSERTATION FOR DOCTOR OF PHYLOSOPHY IN AGRICULTURE THAI NGUYEN - 2011
RELATED PUBLICATIONS 1. Nga To Thi Dang, Van Thanh Dao, (2009), “Study on effects of GA3 and Yogen No. 2 to yield and quality of Vang Thuoc Duoc daisy flowers (Chrysanthemum sp.) in Thai Nguyen”, Journal of Science and Technology, 13(62), Thai Nguyen University Press, pp: 87 - 90. 2. Nga To Thi Dang, Van Thanh Dao, Linh Xuan Nguyen (2010), “Study on effect of lighting time to Vang Thuoc Duoc daisy flowers (Chrysanthemum sp.) in Thai Nguyen”, Journal of Science and Technology, 14(76), Thai Nguyen University Press , pp: 41- 45.
1 INTRODUCTION 1. BACKGROUND Daisy flowers were introduced to Vietnam from the XV century and some small areas for daisy production have been formed to provide flowers for people since XIX century. This flower is used for festivals, ritual purposes or as one kind of medicine. Now daisy flowers are planted everywhere from rural to urban, from upland to lowland areas in Vietnam. Some intensely planting areas are Hanoi (450 ha), Ho Chi Minh (370 ha), Da Lat (160 ha), Hai Phong (110 ha). Thai Nguyen City is located in the Northwest of Hanoi (80 km far from Hanoi), with a total area of 17,707.52 ha. The City is located nearby National Highway 3, linking mountainous regions with lowlands. This played an important role in social - economic development of Thai Nguyen which is also a center for exchanging culture between Thai Nguyen and Northern region. In addition, Thai Nguyen has a convenient transport system and has many universities and colleges such as University of Agriculture and Forestry, University of Education, University of Medicine, University of Economics and Business Administration, College of Education... Therefore, Thai Nguyen is a large consuming market of flowers and the flower production in Thai Nguyen has a high economic efficiency. However, the daisy varieties are still limited, the productivity and quality of daisy flowers are low as well. To contribute to improving the productivity and quality of daisy flowers in Thai Nguyen, we carried out the research: "Studying on some techniques to develop daisy flower production in Thai Nguyen City”. 2. RESEARCH OBJECTIVES AND REQUIREMENTS - Selecting some daisy flower varieties that have high yield, good resistance and are suitable with the ecological conditions for developing flower production in Thai Nguyen and surrounding areas.
2 - Identifying some appropriate techniques to develop daisy flowers in Thai Nguyen. 3. SCIENTIFIC AND PRACTICAL SIGNIFICANCE 3.1. Scientific significance - The results of the research will provide scientific data on some daisy flower varieties that are grown in Vietnam, especially in the ecological conditions of Thai Nguyen. These are the results from studying the growth and development of daisy flowers in two main seasons (Autumn-Winter and Winter-Spring); initially identifying the daisy flower variety with high yield - good flower quality and high economic efficiency; determining a number of appropriate technical methods to improve the productivity and quality of daisy flowers. - The research results are the references of daisy flowers in Vietnam. 3.2. Practical significance Determining the advantaged and disadvantaged factors to daisy flower production and then recommending some methods to develop daisy flowers in Thai Nguyen City. The research results on technical methods will contribute to complete the guideline of daisy flower production in Autumn - Winter and Winter - Spring seasons in Thai Nguyen. 4. RESEARCH SCOPE - Studying 30 imported and local daisy flower varieties to select the variety/varieties that have high yield and quality. - Research location: Thai Nguyen City. - Research periods: From 2003 to 2008. 5. THE NEW FINDINGS OF THE THESIS Based on the survey results of assessing the advantages and difficulties affecting to the daisy flower production in Thai Nguyen, the research results on varieties and farming techniques have confirmed the
3 possible development of daisy flowers in Thai Nguyen. Determining the growth, development and yield of some imported daisy flowers in Autumn - Winter and Winter - Spring seasons in Thai Nguyen and finding out 7 suitable varieties to Thai Nguyen condition (C5, C13, C19, CN20, Vang Thuoc Duoc, Do Bac Moi, Trang Dong Tien). Some technical methods and determining the appropriate planting time for the new daisy flower variety (Vang Thuoc Duoc) have been studied. To have Vang Thuoc Duoc variety bloomed on 20 November occasion in Thai Nguyen, the planting date should be on 10 August and 20 August. Planting Vang Thuoc Duoc daisy flower on 22 November get it bloomed on New Year festival (The growth period is 88.3 days). Spraying a mixture of GA3 and foliar fertilizers (Yogen No. 2) increased flower height and number of first branches, increased pest resistance of Vang Thuoc Duoc in Winter-Spring season. The treatment of lighting additional 4 hours (from 22:00 to 2:00) gave good flower quality and high efficiency; We successfully implemented the demonstration of planting daisy flowers in Thai Nguyen City with Vang Thuoc Duoc and new production techniques. In the Winter-Spring, the profit was 11.79 millions VND per 360 m2 compared to 4.28 million VND in the control treatment. 6. STRUCTURE OF THE THESIS The dissertation was fulfilled with 108 pages, including an introduction and three chapters with 40 tables, 4 figures; 80 references including 35 references in Vietnamese and 45 references in English. Chapter 1 LITERATURE REVIEW 1.1. Daisy flower production and research status in the world The daisy flower studies have been conducted by many scientists around the world. Daisy flower varieties have been hybridized and grown in different ecological zones with the following main research contents: - Forming a source of genetic material for hybridizing, selecting the daisy flowers varieties that have good quality.
4 - Forming the variability by hybridizing and mutation by some agents to create new daisy flowers varieties that have new characteristics as well as colours and flower shapes. - Testing daisy flowers in each different ecological condition to determine the best varieties that are stable, and have high adaptability to the testing condition. - Identifying some technical methods for daisy flowers production to have the best yield and flower quality. 1.2. Daisy flower production and research status in Vietnam In the current daisy flowers production, there have been a lot of the imported daisy flowers that are grown in almost all provinces and cities around the country. The survey results on the areas of daisy flowers in Northern Vietnam by Dang Van Dong (2005) [8] showed that among 51 currently planted daisy flower varieties, there are 24 daisy flower varieties that have quite large planted areas: 88% total planted area. They are Vang Dai Loan (13.7%), CN98 (10.3%), CN97 (98.0%), CN93 (7.7%), CN01 (96.0%), Tim Sen (6%), 27 remaining varieties have small areas (
5 Study of Dang Ngoc Chi (2006) [3] on the planting dates of Dong Tien Trang, Chi Xanh, Mat Troi, CN19, CN20, Cao Boi Tim and Tua Vang showed that: The varieties: Dong Tien Trang, Chi Xanh, Mat Troi, CN19, CN20 which was planted on 15 August bloomed exactly on 20 November vacation with relatively high flower quality; To get the variety Cao Boi Tim had good flower quality on 20 November vacation, we need to plant 5 - 10 days prior to 15 August. The variety of Tua Vang had long growth time and had to accumulate enough temperature for blooming, therefore it needed to plant at the beginning of July for blooming on the occasion of 20 November. When studying the effects of GA 3 products, foliar fertilizers , flower and fruit hormones to the yield and quality of daisy flowers that are grown in Winter-Spring in the flower area of Hanoi, Nguyen Xuan Linh et al. (2006) [19] concluded that all of GA 3, foliar fertilizers s, flower and fruit hormones significantly affected the growth and development of CN 97 daisy flower variety in Winter-Spring season. GA3 had the stronger effect on growth stages, the flower and fruit hormones gave higher effect on development stages. Using a combination of GA 3, fertilizer, flower and fruit hormones increased plant height, flowers quality in the unfavorable condition of flowering time. Chapter 2 REASERCH CONTENTS AND METHODOLOGY 2.1. MATERIALS - 30 daisy flower varieties were collected from the Centre of ornamental plants and flowers - Institute of Agricultural Genetics and from varieties in Thai Nguyen City. - GA 3: white powder 1g/pack (Made in China). - Foliar fertilizers (Yogen No.2): N 30% P2O5 10%, 10% K2O (Made in Yogen Mitsui Vina Company).
6 2.2. RESEARCH CONTENTS - Investigating and evaluating the production and consumption of flowers in Thai Nguyen City. - Selecting daisy flower varieties that have high yield, good quality and are suitable to ecological conditions in Thai Nguyen. - Studying on technical methods to develop daisy flowers in Thai Nguyen including: + Studying on effects of GA3 and Yogen No. 2 to yield and quality of Vang Thuoc Duoc daisy flowers. + Studying effects of lighting time on the growth, development, yield and quality of Vang Thuoc Duoc daisy flowers. + Identifying the planting dates of Vang Thuoc Duoc daisy flowers on 20 November occasion. + Identifying the planting dates of Vang Thuoc Duoc daisy flowers on Vietnamese Lunar New Year. - Building demonstration plot for daisy flowers production in Thai Nguyen City. 2.3. METHODOLOGY 2.3.1. Investigating the production and consumption of flowers in Thai Nguyen City - Using RRA (Rapid Rural Appraisal) and KIP (Key Information Person), through directly interview with a questionnaire prepared with the following criteria: + Flower Production status. + The applied techniques in flower production. + Flower consumption status. - Investigation location: Thai Nguyen City. 2.3.2. Field experiments Experiment 1: Studying morphological characteristics, the growth and development of daisy flower variety group in Thai Nguyen.
7 The experiment included 30 varieties of daisy flowers without replication. The 3-week-old cuttings with roots were planted on the experiment area of 20m2 with density of 33 plants per m2; Plants were grown in natural light conditions. The experiment was monitored in two seasons: Autumn - Winter season in year 2003 and Winter - Spring in year 2003 - 2004 in Quan Trieu Ward - Thai Nguyen City. The plants were grown on 15 August, 2003 in Autumn Winter season and 15 December, 2003 in Winter - Spring season. Experiment 2: Studying growth, development, yield and quality of some promising daisy flower varieties in Thai Nguyen. The experiment consisted of seven promising daisy flower varieties that are selected from the experiment of investigating daisy flower variety group in 2 seasons Autumn - Winter and Winter - Spring in year 2003 - 2004. The varieties were C5, C13, CN20 (control), Vang Pha Le, Vang Thuoc Duoc, Do Bac Moi, Trang Dong Tien. The experiment consisted of seven treatments, three replication with randomized complete block design (RCBD), plot area was 5 m 2. The 3-week-old cuttings with roots were planted with the density of 33 plants/m2; Plants were grown in natural light conditions. The experiment was monitored in two seasons: Autumn - Winter, Winter - Spring in year 2004 - 2005 in Quan Trieu Ward - Thai Nguyen City. The plants were grown on 15 August, 2004 in Autumn Winter season and 15 December, 2005 in Winter - Spring season. Experiment 3: Studying the effects of GA3 and Yogen No. 2 on Vang Thuoc Duoc daisy flowers in Winter - Spring season. The experiment consisted of four treatments, three replications: Water Spraying (Control), GA3 100 ppm, Yogen No. 2 20g/8l, GA3 100 ppm + Yogen No. 2 20g/8l.
8 The experiment was designed in randomized complete block design (RCBD), 5 m 2 for each plot. The 3-week-old cuttings with roots were planted with the density of 33 plants/m2; Plants were grown in natural light conditions. The experiment was monitored in two seasons: Autumn - Winter and Winter - Spring in year 2004 - 2005 in Quan Trieu Ward - Thai Nguyen City. At the time of 15 days after planting, spraying all treatments 3 times with a period of 10 days. Experiment 4: Studying the effect of lighting time on the growth, development and yield of Vang Thuoc Duoc daisy flowers. - The experiment consisted of five treatments: Daisy flowers were grown in natural light conditions (control), plus electric lighting of 0 (control), 2, 4, 6, 8 hours per night, respectively. The experiment consists of five treatments; three replications with randomized complete block design (RCBD) and 5m2 for each plot. The experiment used circular bulb 100W with the density 5m 2 /1 bulb, additional lighting after 10 PM. Do the lighting at the time of 10 days after planting with consecutive 20 days . The experiment was conducted in Winter - Spring in year 2005 - 2006 in Quan Trieu Ward - Thai Nguyen City. Planting date was on 25 December, 2005. Experiment 5: Studying the effect of planting time on the flowering of Vang Thuoc Duoc daisy flowers on the 20 November occasion. The experiment included five treatments from 1st, August to 10th September, 2006. The experiment was designed in randomized complete block design (RCBD) with 5 treatments and 3 replications. The area was 5 m 2 for each plot. The 3-week-old cuttings with roots were planted with the density of 33 plants/m2; Plants were grown in natural light conditions. The experiment was conducted in Quan Trieu Ward - Thai Nguyen City. Experiment 6: Studying the effect of planting time on the flowering of Vang Thuoc Duoc daisy flowers on the Vietnamese lunar new year.
9 The experiment included five treatments from 2nd November to 11th December 2006. The experiment was designed in randomized complete block design (RCBD) with 5 treatments and 3 replications. The area was 5 m 2 for each plot. The 3-week-old cuttings with roots were planted with the density of 33 plants/m2; Plants were grown in additional light condition plus 4 hour lighting per each night (from 10 PM to 2 AM). At the time of 10 days after planting, the plants were lighted with 100W-bulb and 5m2/bulb in consecutive 20 days. The experiment was conducted in Quan Trieu Ward - Thai Nguyen City. Experiment 7: Building demonstration plot for Vang Thuoc Duoc daisy flowers production in Winter - Spring 2007 - 2008 in Thai Nguyen City. - Model 1: Chi Trang variety + Traditional techniques - Model 2: Chi Trang variety + New techniques (4-hour-additional light + GA 3 + foliar fertilizers + appropriate planting date in experiments 3, 4, 6). - Model 3: Vang Thuoc Duoc variety + Traditional techniques. - Model 4: Vang Thuoc Duoc variety + New techniques (4-hour- additional light + GA 3 + foliar fertilizers + appropriate planting date in experiments 3, 4, 6). Each model was carried out in an area of 500 m 2 in 3 households in Quan Trieu Ward, Thai Nguyen City on Lunar New Year occasion, 2007 - 2008. 2.3.3. Monitoring indicators Observing and describing the basic morphological characteristics of collected daisy flower varieties, periods of growth and development (Greening, branching, budding, blooming), plant height and leaf emerging, the number of buds and flowers/plant, the length of cutting flowers, the number of petals/plant, yield, pest and diseases infected ratio, durability of cutting and durability of flowers in nature. 2.3.4. Data analysis The collected information in the survey was stored using Excel 5.0 software. The experimental data was calculated, analyzed, processed using IRRISTAT 4.0 software.
10 Chapter 3 RESULTS AND DISCUSSION 3.1. INVESTIGATING THE FLOWER PRODUCTION AND CONSUMPTION STATUS IN THAI NGUYEN CITY 3.1.1. Status of flower production in Thai Nguyen 3.1.1.1. The structure of flower production area in Thai Nguyen City The structure of flower production in the investigated communes shows that daisy flowers are planted with the largest area (3.84 ha) accounted for 41.7% of total flower areas. The survey showed that in the Winter - Spring season, 100% flower production households had planted daisy flower with the largest area because it is easy to plant and cultivate daisy flowers in Winter - Spring crop (Vietnamese lunar new year); the flower from this crop had the biggest consumption in a year. There were 25.0 to 45.5% households planted daisy flowers in Autumn - Winter crops. Almost households believed that the climate in 2 crop seasons: Spring-Summer and Summer- Autumn was not favorable for daisy flowers to develop and the this flower consumption was not high at that time also. These are the reasons for them to not enlarge the daisy flower area. Surveying on the application of technical methods, almost interviewers said they used traditional techniques to cultivate daisy flowers (55.5 - 70.6%). Thus, information on technical advances have not been taught or have taught yet, but lack of specific guidance or high investment for new techniques is required, so that daisy flower production households have still not applied new techniques in their cultivation. However, some families have applied new techniques in planting daisy flowers (29.4 to 44.5%), especially in Winter-Spring crop because the daisy flowers response to short day light, so it needed to increase the lighting time to get the higher quality of daisy flowers. Almost those households believed that using new daisy flower varieties and new techniques would give much higher yield and daisy flower quality than the old ones.
11 3.1.1.2. The favorable and unfavorable factors for daisy flower production in Thai Nguyen Investigating the favorable factors for production of daisy flower showed that the most favorable ones were easy to consume and required average investment (selected by 100% households). The second favorable factor was the land: 77.1% households thought that good land and near the consumption market were favorable. Some flower growers could make use of the land after harvesting summer rice to plant daisy flowers for Vietnamese lunar new year occasion. That daisy flowers were easy to plant and grow was the opinion of 80.1% households. The survey also showed that the biggest difficulty was the shortage of good varieties, 77.4% households believed that there was still lack of good daisy flower varieties with high yield and flower quality. That was the main difficulty to daisy flower production. Pests and diseases were also factors that limited yield and quality of daisy flowers. Up to 79.4% households thought that the factors such as aphids, thrips, leaf spot disease and Rhizoctonia root rot caused the main damage to daisy flower production. Lacking of technology is also an important factor limiting production of daisy flower (selected by about 70.2% households). In addition, erratic weather conditions of temperature, light, humidity did affect the quality of flowers and could make flowers bloom early or late and caused big loss for daisy flower growers (indicated by 69.5% households). 3.1.2.4. Solutions to overcome the disadvantaged factors to daisy flower production in Thai Nguyen Based on the survey results, we realized that there were many disadvantaged factors to daisy flower production in Thai Nguyen. The
12 problem of lacking good varieties with high yield and flower quality, suitability with ecological condition, diseases, lacking of technical guidelines, technology applying to planting daisy flowers. To develop daisy flower production in Thai Nguyen, we propose some solutions as follows: - Investigating, collecting and classifying the current daisy flower varieties based on their response to the light. - Determining the adaptability of daisy flower varieties and selecting ones with high yield and good quality suitable with ecological conditions and the flower demand of Thai Nguyen. - Applying new technical methods to improve daisy flower productivity, quality in Thai Nguyen: using foliar fertilizers and growth hormones, additional lighting, reasonable planting time etc. 3.2. RESULTS FROM SELECTING DAISY FLOWER VARIETIES WITH HIGH YIELD, GOOD QUALITY AND SUITABLE WITH ECOLOGICAL CONDITIONS IN THAI NGUYEN 3.2.1. Studying morphological characteristics, growth and development of daisy flower Group in Thai Nguyen - Plant characteristics: The daisy flower varieties in experiments could be classified into three groups: high, medium, and low height. The varieties belonged to high plant type were: Cao Boi, C13, C19, Do Bac Moi, C5, Vang Thuoc Duoc. The varieties belonged to medium plant type were: C6, C7, Dau Do, Sao Nho, Da Bo and some low plant type varieties: Anh Bac, Vang Pha Le, Trang Dong Tien. + About the branch density: The varieties in experiments ranged from medium to dense density of branches. Almost varieties that had dense branches were small flower varieties; the others had bigger flowers. + Daisy plants shape was vertical, semi-vertical and semi-spherical type. Most daisy flower varieties had many branches and flower clusters, thus, some varieties belonged to vertical plant type such as C5, CN19, CN20, Cao Boi, Do Bac Moi, Canh Sen... Varieties belonged to semi- vertical plant type were: C7, C13, Vang Thuoc Duoc. Varieties belonged to semi-spherical plant type were Sao Nho, Chi Trang Chau.
13 - Characteristics of the stem colors were different among varieties: dark green, green, light green, violet, brown violet. Daisy flower varieties that had dark green stem were: C4, CN19, CN20, Vang Thuoc Duoc, Chi Nghe, Do Bac Moi. Varieties that had green stem were: C13, Vang Nhi Xanh, Trang Tuyet, and those with violet stem ones were Vien Tim, Muong Hong. - Flower characteristics: All daisy flower varieties in experiments had medium or small flower diameter and almost served for cutting or pot planting purposes. + The color of daisy flower varieties were plentiful, variable with the colors like white, red, purple, yellow, pink, green or a flower with mixed colors such as: Dau Do, Muong Hong, Vien Tim, Tho Do. + Type and shape of daisy flower were quite complex. Some varieties were double flower type with tight-short-petal such as C5, C9, Vang Thuoc Duoc. Some varieties were single flower type with loose-pipe-petal such as Anh Bac, Muong Hong or other type was single flower with tigh-big-petal such as C13, Do To Ong, Trang Tuyet, Tim Hoa Ca. From the preliminary research, we conducted the experiments to compare some promising daisy flower varieties. They were cluster branch daisy flower varieties: C5, C13, CN20, Vang Pha Le, Do Bac Moi, Vang Thuoc Duoc, Trang Dong Tien. These were varieties that had been planted and favored by the consumers due to their high plant type, erect leaf shape, medium flower diameter, high durability with favorable and plentiful flower colors. 3.2.2. Results from study on the growth, development, yield and quality of some promising daisy flower varieties in Thai Nguyen 3.2.2.1. Indicators on yield and quality of some promising daisy flower varieties in Autumn-Winter and Winter-Spring crops in Thai Nguyen Results of monitoring flower yield - quality indicators of daisy flower varieties in experiments were presented in Table 3.17.
14 Table 3.17: Some indicators of productivity, quality of some promising daisy flower varieties in Autumn - Winter crop (2004) and Winter - Spring crop (2004-2005) in Thai Nguyen Autumn - Winter crop Winter - Spring crop Indicators Number Number Number Number Number Number of of Flower of Flower of buds/ of buds/ of petals/ flowers/ petals/ diameter flowers/ diameter plant plant flower Varieties plant flower (cm) plant (cm) (buds) (buds) (petals) (flower) (petals) (flower) 1. C5 14.1 12.0 353.2 3.9 12.8 10.5 339.0 3.8 2. C13 49.1 23.8 34.4 9.2 45.1 28.1 32.9 7.6 3. CN20 (Control) 28.6 19.7 36.4 4.0 27.4 26.2 34.2 3.2 4. Vang Pha Le 18.4 17.8 248.4 6.8 15.6 12.9 248.4 6.8 5. Do Bac Moi 51.0 47.1 49.0 5.3 50.0 48.2 45.0 4.8 6. Vang Thuoc Duoc 17.3 15.0 327.2 3.9 15.5 12.2 320.3 3.1 7. Trang Dong Tien 14.1 12.6 126.0 10.8 12.7 10.5 122.1 8.3 CV(%) 3.9 5.8 6.8 7.8 8.3 4.6 9.4 8.4 LSD05 1.3 2.2 16.2 0.6 2.5 1.7 25.7 0.5 - The number of buds per plant of daisy flower varieties in experiments in Autumn - Winter and Winter - Spring crops ranged largely whereas in both cropping seasons. DO Bac Moi variety had the highest buds number per plant (51.0 to 47.1 buds) and higher than the control. C5 variety had the least buds number per plant (14.0 to 12.8 buds) and fewer than the control. - The number of flowers per plant of varieties in Autumn - Winter crop ranged from 12.0 to 47.1 flowers. Do Mac Moi variety had the highest number of flowers (47.1 flowers), C5 variety had the fewest number of flowers (12 flowers). In Winter - Spring crop, the number of flowers per plant varied from 10.5 (C5, Trang Dong Tien) to 48.2 flowers (Do Bac Moi). - The number of petals per flower mainly depended on the characteristics of each variety, thus the its variation between two cropping
15 seasons: Autumn - Winter and Winter - Spring were not much but there were significant differences in number of petal per flower among varieties. Number of petals helps to distinguish single or double flower varieties, short or long flower durability. The varieties with many petals per flower usually have beautiful flower shape with semi-spherical flowers such as C5, Vang Thuoc Duoc. In experiments there were 4 varieties which had the highest number of petals per flower including C5 (353.2 to 339.0 petals), Vang Thuoc Duoc (327.2 to 320.3 petals), Vang Pha Le (248.4 petals), Trang Dong Tien (126.0 petals). The remaining varieties had the number of petals per flowers as high as the control of C20 variety. The Do Bac Moi had the lowest number of petals per flower (34.4 to 32.9 petals). - Flower diameter had the difference among tested daisy flower varieties and between cropping seasons: Autumn - Winter and Winter - Spring. It meant that the Flower diameter depended not only on the genetic characteristics, but also depends on nutrient and ecological conditions. In Autumn - Winter crop, the flower diameter ranged from 3.9 cm to 10.8 cm. the variety with largest flower diameter was Trang Dong Tien (10.8 cm) and the smallest was C5 (3.9 cm). In Winter - Spring the flower diameter varied from 3.1 cm - 8.3 cm and the largest flower diameter was Trang Dong Tien Variety (8.3 cm) and the smallest was Vang Thuoc Duoc (3.1 cm). 3.2.2.2. Economic efficiency of promising daisy flower varieties in Thai Nguyen The economic efficiency calculation table showed that Vang Thuoc Duoc and C5 varieties had the highest price compared to others and the flower yield was high, thus it had the highest return per investment capital (2.28 and 2.00 times). Especially Vang Thuoc Duoc with medium circle, semi-spherical flower with tight-light yellow - petals, was most enjoyable by almost consumers. Based on the experiment results and consulting with the flower growers in the trial production, economic efficiency from production of daisy flower varieties in the experiments, we have chosen Vang Thuoc Duoc variety to study some technical methods to improving the flower yield and quality.
16 3.3. STUDY RESULTS OF SOME TECHNICAL METHODS FOR HIGHER YIELD AND QUALITY OF VANG THUOC DUOC DAISY FLOWER VARIETY IN THAI NGUYEN 3.3.1. Results of study on the effect of GA3 and Yogen No. 2 on yield and quality of Vang Thuoc Duoc daisy flower Results of monitoring the effects of GA 3 and Yogen No. 2 on yield and quality of Vang Thuoc Duoc daisy flower were presented in Table 3.25. Table 3.25: Effects of GA3 and Yogen No. 2 on yield and quality of Vang Thuoc Duoc daisy flower in Winter-Spring season (2004-2005) in Thai Nguyen Indicators Number Ratio of Number Number Durability Durability of Flower real of buds/ of petals/ of cutting of flowers flowers/ diameter cutting plant flower flowers in nature plant (cm) flowers (buds) (petals) (days) (days) Treatments (flowers) (%) 1.Water sprayed 16.6 11.7 316.3 2.8 13.3 17.3 85.5 (control) 2.GA3 17.3 12.2 327.3 3.1 13.3 18.1 90.3 3.Yogen No. 2 17.3 11.9 327.0 3.1 13.3 18.1 89.3 4.GA3+Yogen No.2 17.7 12.1 324.3 3.2 13.3 19.0 95.3 CV ( %) 4.2 6.2 5.5 3.3 LSD05 1.45 1.48 0.33 1.17 The Table 3.25 showed that: - The number of buds per plant of treatments ranged from 16.6 to 17.7 buds. The treatment 1 (control) had the lowest number of buds (16.6) and treatment 4 (GA 3 + Yogen No. 2) had the highest number of buds that reached 17.7 buds. - Number of flowers per plant: The number of flowers per plant among treatments were not much different, ranging from 11.7 to 12.2 flowers. However, there is no statistical significant difference among treatments. - Diameter of flowers in treatments ranged from 2.8 to 3.1 cm. The treatments 1 (control) had the smallest flower diameter (2.8 cm), the
17 highest one was treatment 4 (GA spray 4 + Yogen No .2) (3.2 cm) and higher than the control. - Number of petals: There is variation among treatments from 316.3 to 327.3 petals. The water spraying treatment has the lowest number of petals (316.3 petals), followed by treatment of GA 3 + Yogen No. 2 (324.3 petals). Both treatments: GA 3 (327.3) and Yogen No. 2 (327.0) had higher number of petals than the control. - Flower durability: The durability of cutting flowers have no reliable differences among the treatments, natural durability of the treatments varied from 17.3 to 19.0 days. After analyzing, we could see that treatment 2, 3 had no significant difference from the controls. Treatment 4 had the natural durability which is significantly longer than the controls at 95% confidence level. - The actually harvested flower rates varied from 85.5 to 95.3%. Treatment of Spraying GA3 + Yogen No. 2 had the highest rate (95.3%) and the lowest rate was the control (85.5%). 3.3.2 Results of studying the effects of additional light on yield and quality of Vang Thuoc Duoc daisy flower - Flower Height: Ranged from 67.8 - 71.0 cm in treatments of light, significantly higher than the control (control: 43.2 cm); treatment 5 (8 hours) had the highest plant height (67.8 cm), while the lowest plant height was treatment 1 (control) - The number of buds and flowers per plants: Treatments with additional light has buds ranging from 17.9 to 22.3 buds (more than the control 8.1 buds per plant); treatment 3 (4 hours) had the highest buds (22.3 buds). The results suggested that if additional lighting time is long (6 to 8 hours), the number of buds will decrease, as the flower splitting process of the plant was inhibited. Similarly, the number of flowers per plant in treatments with additional lighting varied from 14.3 to 17.1 flowers, significantly higher than the control by 6.6 to 9.6 flowers (the control was 7.5 flowers).
18 Table 3.29: Effects of additional lighting time on yield and quality of Vang Thuoc Duoc daisy flowers in Winter-Spring crop (2005-2006) in Thai Nguyen Indicators Number Durability Ratio of Number Number Durability Plant of Flower of real of buds/ of petals/ of cutting height flowers/ diameter flowers in cutting plant flower flowers (cm) plant (cm) nature flowers (buds) (petals) (days) Treatments (flowers) (days) (%) 1 (control) 43.2 8.5 7.5 3.2 322.7 11.3 17.0 82.3 2 (2 h) 69.4 18.6 14.3 3.3 328.9 12.9 17.9 92.3 3 (4 h) 68.7 22.3 17.1 3.5 335.3 14.2 18.6 96.6 4 (6 h) 67.8 17.9 15.1 3.3 329.7 13.3 17.7 97.0 5 (8 h) 71.0 19.7 15.6 3.3 332.8 12.8 17.2 98.5 CV (%) 6.7 9.5 7.0 1.9 1.7 4.1 3.6 LSD05 8.137 3.106 1.824 0.119 10.505 0.994 1.194 - Flower Diameter and petal per flower: All treatments with additional lighting had larger flower diameter than the control (3.2 cm). They ranged from 3.3 to 3.5 cm in flower diameter and from 328.9 to 335.2 petals per flower. Treatment 3 (4 hours) had the biggest flower diameter (3.5 cm) with 335.2 petals/flower, higher than the control at 95% confidence level. Others had the equivalent flower diameter (3.3 cm) and higher than the con troll at the reference of 95%. - Durability of cutting flowers in treatments varied from 12.8 to 14.2 days higher than the control (11.3 days). - Durability of flower in nature: The durability of all treatments varied from 17.2 to 18.6 days. The treatment 3 (4 hours) had the highest Durability of flower in nature (18.6 days), significant higher than the control at the 95% confidence level. The other treatments had durability as long as the control. - The ratio of harvested flowers: Treatment 2, 3, 4, 5 that had additional lighting time gave the higher ratio than the control (treatment 1) from 10.0 to 17.2%. Treatment 5 (8 hours) gave the highest ratio (98.5%). 3.3.3. Results of studying the effects of planting date on the blooming of Vang Thuoc Duoc Daisy flower on 20th November occasion 3.3.3.1. Period of growth and development of Vang Thuoc Duoc Daisy flowers Results of monitoring the periods of growth and development are represented in Table 3.31.