• Horticultural Science & Technology
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• v.28 no.4
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• pp.540-544
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• 2010

The nursery plant quality and flower bud induction of new strawberry cultivars, 'Maehyang' and 'Seolhyang' in forcing culture were evaluated in the highland and lowland region. In order to produce daughter plants, the new cultivars were grown in the open field located at both highland (Daekwallyung, above 800 m sea level) and lowland (Gangneung, above 20 m sea level) region, respectively. The average air temperature at highland during nursery plant propagation period was $5.3^{\circ}C$ lower than those at lowland. The number of daughter plants produced at lowland was 2 times as high as those of highland, presumably due to the higher air temperature. Anthracnose incidence rates of runner plants produced at lowland were 4 to 7% as high as those in highland. Mean temperature in the highland ($23.5^{\circ}C$) during flower bud differentiation treatment was $5.1^{\circ}C$ lower than that in the lowland ($28.6^{\circ}C$). Seedlings produced in highland showed higher C/N ratio and lower T/R ratio compared to those produced in lowland. The average flower bud formation date of the daughter plants grown in highland were advanced by 30 days compared to the date in lowland. Accordingly, highland was supposed to be appropriate region for raising seedlings in forcing culture of the new strawberry cultivars of 'Maehyang' and 'Seolhyang'.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.55 no.1
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• pp.47-57
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• 2010

More than 2,500 accessions of squash germplasm are preserved in the National Agrobidiversity Center of RDA, Korea. We investigated the ecological and morphological characteristics on 100 accessions of the squash germplasms with a low viability. Two typical types of oriental squash (Cucurbita moschata) and western squash (Cucurbita maxima) are possessed 89 and 11 accessions, respectively. The origin of 100 accessions was divided into three groups, group I (Korea landraces with 81 accessions), group II (Nepal with 15 accessions) and group III (Russia, Uzbekistan, Laos, and Mexico with each one accession). Seventy eight accessions germinated at $27^{\circ}C$ in growth chamber. Days to first flowering of the female and male flower ranged from 32 days to 67 days and 24 days to 55 days after planting, respectively. Vine length showed the largest variation ranging from 357.8 cm to 1,465 cm, also the average length of ten stem node range has a variable ranges from 92 cm to 217.5 cm. All regenerated squash accessions have an only collided tendril and have three to seven lateral shoots. The flattened globe-shaped squash is the most predominant and exhibited ordinarily round shaped, ball shaped, long oblong-shaped, elongated shape, and pear shape. The average weight of fruit ranged from 1.33 kg to 7.95 kg. Sugar contents showed 5.4~12.6 $Brix^{\circ}$ without ripening period.

• The Journal of Natural Sciences
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• v.14 no.2
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• pp.103-114
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• 2004

This study aims at investigating the effect of soil moisture control and truss limited high density culture on the growth, fruit yield and quality of tomato. To minimize of loss yield of tomato, flower cluster in number was limited to two and three truss and planting density was raised. Soil moisture control was started from 40 days after anthesis and irrigation point was set in -30kPa and -50kPa, which were compared with -10kPa For high density culture, the planting number of truss limited high density culture was planted twice as many as control. Soil moisture repression reduced the growth of stem diameter, leaf and plant height. Leaf chlorophyll content was higher in -50kPa and -30kPa than control. No significant differences, however, shows in -10kPa. The occurrence rate of bloom-end rot and cracking was increased by growing of irrigation repression. Pinching three fruit truss was higher than pinching two fruit truss in the occurrence rate of them. Soil moisture repression resulted in the reduction of fruit weight and in special, truss limited high density was distinctly decreased in -50kPa. The number of fruit was not affected by soil moisture control, but 3rd flower cluster was lower than 2nd flower cluster in the number of fruits and 2nd one was lower than 1st one. Under irrigation repression, rate of dry matter tended to grow in -30kPa, -50kPa compared with control and pinching three fruit truss was higher than two truss. Marketable yield dropped to 36.7%m 46.3 in -30kPa, -50kPa on pinching two fruit truss and dropped to 27.3%, 32.3% in 3rd flower cluster compared with control.

• FLOWER RESEARCH JOURNAL
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• v.18 no.4
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• pp.251-255
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• 2010

This study was conducted to investigate the detrimental effects of decapping and emasculation on the postharvest quality and the vase life of cut Cymbidium flowers with or without 1-Methylcyclopropene (1-MCP) and Aminoethoxyvinylglycine (AVG) treatments. The vase life treated by 1-MCP 150 ppb for four hours regardless of decapping or emasculation was significantly prolonged 12 days more. Ethylene production in the treatment without 1-MCP began to be raised from 7days, 1-MCP treatments, regardless of the concentration of processing did not occur until 15days. Ethylene began to production when the lip began to coloration. Compared to the 1-MCP effect, the AVG treatment of 0.5 and 1mM for four hours prolonged the vase life about nine days more. Whereas, the only decapping or emasculation treatments were effective to more three days longer in the vase life of cut Cymbidium' Halleluiah' flowers. 1-MCP treatment was very beneficial for Cymbidium 'Halleluiah' cut flowers than AVG.

• FLOWER RESEARCH JOURNAL
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• v.16 no.4
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• pp.260-265
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• 2008

Studies were carried out to elucidate the effect of temperature, glasshouse forcing date and $GA_3$ on the growth and flowering of pot Hydrangea macrophylla Ser. The plant height was elongated in the $5^{\circ}C$ treatments as 38 cm compared with $20^{\circ}C$ treatment as 6.7 cm, and stem length showed the similar results. The leaf length and width was broadened in the lower temperature, and stem diameter showed the same tendency. The first flowering date in the $15^{\circ}C$ and $20^{\circ}C$ treatment shortened markedly than $5^{\circ}C$ treatment. Days to flowering date of $5^{\circ}C$ was 161 day, while it shortened as 88 day in the $15^{\circ}C$ treatment. The flowering rate was 75.8~90.7% in the temperature. The plant height was elongated in the late glasshouse forcing date, and the leaf length and width showed the similar tendency. The plant height increased in the higher concentration of $GA_3$ compared to the control, and leaf length and width showed the similar results. The first flowering day was advanced by 7 days in the $GA_3$ $50mg{\cdot}L^{-1}$ treatment which had been transferred to greenhouse on Dec. 30 compared with the control of which first flowering day was March 17, and the days to first flowering was conspicuously shortened in the late glasshouse forcing treatment. The width of flower cluster was increased in the $GA_3$ at Dec. 30 glasshouse forcing treatment. The flowering rate was markedly decreased as 62.3% in the control of Nov. 15 treatment, but was increased as 97.9% of $GA_3$ $50mg{\cdot}L^{-1}$ of Jan. 15 treatment.

• Journal of agriculture & life science
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• v.45 no.6
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• pp.73-80
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• 2011

To investigate the characteristics of plant growth and flower quality of gerbera 'Sunny Lemon' by amount of nutrient solution, young seedling plants, 'Sunny Lemon' were transplanted to rock-wool and medium of peat moss and perlite mixed with 1 to 2 and they were acclimatized in greenhouse during about 1 month. Nutrient solution supplied to the plants is sonneveld solution of 1/2 concentration and treatments launched June 24, 2010 when average plant height was $20{\pm}1cm$. Nutrient contents as a standard for starting point of irrigation by time domain reflectometry (TDR) were determined with 60-65%, 70-75%, and 80-85%. Results of growth during vegetative growth, plant height, leaf width and leaf number increased by 10% in rockwool, but they were not significantly different. As for plant growth depending on nutrient content, 80-85% treatment showed the highest values. Leaf number increased by 60%, and leaf width and plant height had a about 40% increase than initial growth. Effectiveness for flower quality, yield and days to flowering were superior when nutrient content of media was higher than in the others. Especially, average days to flowering in 80-85% content was advanced by 7-10 days compared to the day in 60-65% treatment. The total amount of nutrient supply per plant was higher in mixed medium than in rockwool, but change patterns of EC and pH were enhanced in rockwool. Based on our results, we recommended that growth, cut flower, and yield of gerbera 'Sunny Lemon' were more effective when nutrient content of mixed medium was maintained at 80-85%.

• Journal of Bio-Environment Control
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• v.27 no.2
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• pp.158-165
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• 2018

The effects of different kinds of supplementary lighting or heating lamps on the yield, cut flower life, and leaf color of cut rose were compared and analyzed. For this purpose, light emitting diode lamp (LED), metal halide lamps (MH), and high-pressure sodium lamps (HPS) as the supplementary lamps, and carbon fiber infrared lamp (NCFI) were installed on hydroponic cultivation bed in a cut rose farm. The yield of cut flower rose and the number of marketable flowers were greatly increased in spring and autumn by HPS treatment, but not in winter. The length of flower stalk was longer than that of control in the spring but decreased in winter. It seemed likely that the shorter flower stalk in winter was due to the shortened period of vegetative growth compared to the control because flowering was promoted by supplementary lighting. Vase life was not different among treatments in the autumn when the lighting time was short, but in winter, it was prolonged to 3 more days by only HPS, compared with the control. Leaf color was significantly affected by light treatment in winter rather than autumn. Leaf color was darkened in all supplementary lamps (LED, MH, HPS) treatment, whereas NCFI was similar to the control in leaf color. In conclusion, HPS is considered to be a very good supplementary lamp because it increases the length of flower stalk and the yield and prolongs vase life in cut roses. Even though NCFI could function as a heating lamp radiating a lot of heat, it was considered that the role as a supplementary light is unsatisfactory because the number of marketable flowers decreases and the quality index of cut rose deteriorates by NCFI.

• Journal of Plant Biotechnology
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• v.31 no.3
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• pp.209-217
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• 2004

The shoots of balloon flower (Platycodon grandiflorum A. DC.) in vitro germinated from seeds were cultured on MS basal medium containing 0.1 mg/L NAA under the various sucrose concentrations and with/without membrane filter (MF) on the lid of vessel. The growth responses were checked to obtain healthy plantlets. The $CO_2$ and $C_2$H$_4$ concentration in vessel without MF were higher than those with MF. The $CO_2$ concentration without MF was increased as days in culture went by whereas the $C_2$H$_4$ concentration was decreased. The plant growth with MF and high sucrose concentration was good. Fresh and dry weight of plantlets cultured in sucrose 4.5% with MF were higher than those in no sucrose without MF. Also the content of chlorophyll of plantlets cultured with MF was high and the content of sugar was shown a similar results and a remarkable difference between MF treatments, especially. Stomata cultured with MF was closer than that without MF and mesophyll of leaf were more developed with MF or in high sucrose concentration. When the plantlets were transplanted in the pot at 25$\pm$2$^{\circ}C$, 75% relative humidity and low PPFD (photosynthetic photon flux density), the percentage of survival after 13 days without MF was 0% but it was 100% with MF regardless of sucrose concentrations.

• Journal of People, Plants, and Environment
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• v.23 no.6
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• pp.655-665
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• 2020

Background and objective: This study was conducted to compare the cultivation environment, growth of cut flowers, and management performance of conventional farms and smart farms growing the standard cut chrysanthemum, 'Jinba'. Methods: Conventional and smart farms were selected, and facility information, cultivation environment, cut flower growth, and management performance were investigated. Results: The conventional and smart farms were located in Muan, Jeollanam-do, and conventional farming involved cultivating with soil culture in a plastic greenhouse, while the smart farm was cultivating with hydroponics in a plastic greenhouse. The conventional farm did not have sensors for environmental measurement such as light intensity and temperature and pH and EC sensors for fertigation, and all systems, including roof window, side window, thermal screen, and shading curtain, were operated manually. On the other hand, the smart farm was equipped with sensors for measuring the environment and nutrient solution, and was automatically controlled. The day and night mean temperatures, relative humidity, and solar radiation in the facilities of the conventional and the smart farm were managed similarly. But in the floral differentiation stage, the floral differentiation was delayed, as the night temperature of conventional farm was managed as low as 17.7℃ which was lower than smart farm. Accordingly, the harvest of cut flowers by the conventional farm was delayed to 35 days later than that of the smart farm. Also, soil moisture and EC of the conventional farm were unnecessarily kept higher than those of the smart farm in the early growth stage, and then were maintained relatively low during the period after floral differentiation, when a lot of water and nutrients were required. Therefore, growth of cut flower, cut flower length, number of leaves, flower diameter, and weight were poorer in the conventional farm than in the smart farm. In terms of management performance, yield and sales price were 10% and 38% higher for the smart farm than for the conventional farm, respectively. Also, the net income was 2,298 thousand won more for the smart farm than for the conventional farm. Conclusion: It was suggested that the improved growth of cut flowers and high management performance of the smart farm were due to precise environment management for growth by the automatic control and sensor.

• Journal of the Korean Society of Food Science and Nutrition
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• v.41 no.11
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• pp.1611-1618
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• 2012

Peeled balloon flower roots and parboiled bracken are pre-processed foodstuffs commonly used in the institutional food service. This study was conducted to establish the suitable manufacturing process for these foodstuffs and the optimal storage condition during distribution in the market. The most suitable manufacturing process was developed by surveying the manufacturing factories that produce these foodstuffs. Samples were collected by selecting a site among the surveyed manufacturing factories and storing them at different temperatures (4, 10, $20^{\circ}C$). The resulting changes in microbiological, physicochemical, and organoleptic qualities depending on the storage period (1, 2, 3, 4, 5, 7, 10 days) were investigated. The number of general bacteria in balloon flower roots at the beginning of the storage period was 5.26 log CFU/g and the number in the $4^{\circ}C$ storage group remained unchanged until the $3^{rd}$ day, but then increased to 7.63 log CFU/g at the $4^{th}$ day, and then gradually increased up to the $7^{th}$ day. However, in the 10 and $20^{\circ}C$ storage groups, the number was rapidly increased to 7.42 log CFU/g and 7.86 log CFU/g, respectively, at the $2^{nd}$ day. The parboiled bracken samples presented a similar trend. For physicochemical quality changes, the pH and hardness were rapidly decreased in the $20^{\circ}C$ storage group. The organoleptic quality was favorably evaluated (5~6 points out of 9 points) up to the $5^{th}$ day in the $4^{\circ}C$ storage group but the overall acceptability was rapidly decreased from the $2^{nd}$ day in the other storage temperature groups. These results confirmed the optimal storage condition for these pre-processed foodstuffs as being less than 3 days at $4^{\circ}C$.