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Hyo Gil Choi,Jae Han Lee,Byoung Yong Moon,Joon Kook Kwon,Gyeong Lee Choi,Seung Hwa Lee,Nam Jun Kang 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.4
This study was carried out to explore possibilities of cultivating horticultural crops in the air-dome greenhouse in comparison to the common iron-frame greenhouse as the standard. The levels of carbon dioxide and atmospheric pressure measured inside the air-dome greenhouse turned out to be higher than those measured inside the iron-frame greenhouse. Contrastingly, light intensity was relatively weaker inside the air-dome greenhouse due to the air-inflated double layers. Plants of melon and cherry tomato were cultivated from May 2 to August 12, 2016, respectively in the two greenhouses. For melon plants, growth in the air-dome greenhouse effectively increased fruit weight as well as trunk circumference compared to iron-frame greenhouse. Moreover, soluble sugar content of melon fruit was significantly higher when cultivated in the air-dome greenhouse. For cherry tomato plants, fruit yield of cherry tomato was significantly increased inside the air-dome greenhouse. Furthermore, it has been found that the air-dome greenhouse was considerably effective in shortening the growing period of melon and cherry tomato plants in comparison to the iron-frame greenhouse.
Hyo Gil Choi,Ho Jeong Jeong 한국원예학회 2020 원예과학기술지 Vol.38 No.1
The aim of this study was to evaluate growth response of two greenhouse-grown strawberry cultivars grown under two different relative humidity (RH) regimes using photo-physiological measurements, such as photosynthetic rate and photosynthesis efficiency (with the initial chlorophyll fluorescence curve part of 0 ‑ 30millisec (OJIP) transients). The two different RH regimes (< 40% and > 60% RH) were maintained during daylight hours from November 20, 2018 to December 20, 2018. After 15 days of controlled humidity treatment, we found significant differences in photosynthetic rates, stomatal conductance, energy flux trapped by one active photosystem II reaction center (TRo/RC), and rate of electron transport flux of photosystem II reaction center (ETo/RC) values relative to cultivar type and RH. However, after 30 days of humidity treatment, the significant differences in these photosynthesis related parameters were responses related to RH treatment effects regardless of the cultivars. Both ‘Arihyang’ and ‘Keumsil’ cultivars grown under > 60% RH (during the day) showed higher root activity, reflecting multiple turnover of QA reductions (Ss), TRo/RC, and ETo/RC values than when grown under < 40% RH. In addition, relative variable chlorophyll fluorescence at 2millisec (Vj) and relative variable chlorophyll fluorescence at 30millisec (Vi) values were higher in the ‘Arihyang’ cultivar (regardless of RH) than in the ‘Keumsil’ cultivar. We conclude that maintaining high relative humidity inside greenhouses during the cold season (when RH is naturally low) will optimize strawberry fruit yield by enhancing root activity and photosynthetic rates.
Hyo-Gil Choi,Nam-Jun Kang 경상대학교 농업생명과학연구원 2020 농업생명과학연구 Vol.54 No.6
In this study, we investigated the effects of the ripening level (50% and 100%), storage temperature (1°C and 10°C), and storage period (0, 7, and 14 days) on the fruit quality of the strawberry (Fragaria × ananassa Duch) cultivars “Arihyang” and “Kuemsil”, which are commonly grown for export in South Korea. Strawberry plants of each cultivar were grown in a plastic greenhouse, and fruit samples were harvested in January 2019 to evaluate the fruit hardness, gray mold rot, anthocyanin content, sugar content, and antioxidant activity. We found that “Arihyang” had a greater fruit hardness than “Kuemsil” across all storage periods excluding the day of harvest, and that fruit stored at 1°C had a greater hardness than fruit stored at room temperature (10 ± 2°C) for both cultivars. In incidence of gray mold rat, “Kuemsil” had a higher than “Arihyang”. The soluble solid content was highest at 7 days after harvest for both cultivars, with the exception of “Kuemsil” following storage at 1°C. The anthocyanin content was higher in “Arihyang” than in “Kuemsil” and was also greater in fruit that had been stored at room temperature due to the faster ripening time. Finally, the DPPH activity of fully ripened fruit tended to decrease as the storage period increased, while the ABTS activity was the same across all treatments. These findings demonstrate that “Arihyang” are more advantageous for long-term distribution as well as export than “Kuemsil”, and recommend that the two new cultivars of strawberry be cool stored at 100% ripening state and eaten within 7 days.