• Journal of Bio-Environment Control
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• v.18 no.3
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• pp.258-265
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• 2009

This research was conducted to compare drymatter production and yield pattern between commercial glasshouse (G) and plastic greenhouse (PG) in Korea. In both greenhouses sawing and plating of sweet pepper was 28 August and 27 September, 2007. Destructive measurement and yield of sweet pepper, cv. 'Derby', was obtained from January to May, 2008. Averaged light transmissivity over 20 times observed 65% in G and 51 % in PG. The averaged daily radiation sum of greenhouses during whole growing period was $9.03MJ/m^2/day$ for G and $7.37MJ/m^2/day$ for PG Leaf area index (LAI) in G crop was 36% higher than the crop in PG at the end of experiment (247days after planting: DAP), whereas there was no significantly difference for 212 DAP in both greenhouses. Total dry matter production was $1759.9g{\cdot}m^{-2}$ for G and $1308.5g{\cdot}m^{-2}$ for PG Fruit production observed $14.1kg{\cdot}m^{-2}$ in G and $7.8kg{\cdot}m^{-2}$ in PG. There was slightly difference measurement of dry matter distribution of generative or vegetative parts to total dry matter between G and PG.

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.335-341
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• 2021

In this study, experiments were conducted to investigate the effects of high- temperature stress on paprika in a semi-closed greenhouse where cooling is available and a normal plastic greenhouse. Paprika grown in a semi-closed greenhouse in which geothermal cooling is provided showed a significantly higher speed of photosynthesis than paprika grown in a 3-layer plastic greenhouse in which there is no cooling system. It suggests that the photosynthesis speed of paprika in a plastic house decreases owing to high temperature stress. Plant height increased by 13cm more in the semi-closed greenhouse, and the size of leaf showed similar growth speed until the 2nd week after transplanting, however, after 3 weeks, the semi-closed greenhouse showed a big difference by 47% compared with the plastic greenhouse. In terms of the fruit count, the semi-closed greenhouse had 10.6 fruits/plant and the plastic greenhouse had 4.6 fruits/plant, indicating that the semi-closed greenhouse had a higher number of fruits by 130% than the plastic greenhouse. The fruit weight also presented a difference between the semi-closed greenhouse and the plastic greenhouse by 46%, which is 566.7g/plant and 387g/plant, respectively. According to the above mentioned results, it was validated that when paprika is cultivated in a semi-closed greenhouse where a cooling system is applied, photosynthesis and growth were better than in the normal plastic greenhouse. Thus, if the hot summer season is overcome by applying the elemental technologies for the cooling system to the normal plastic greenhouse, farm income may increase through improvement in the yield and quality.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.39 no.6
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• pp.41-46
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• 2010

시설 재배용 온실에 적용된 냉온수 축열이 결합된 지열 히트펌프시스템에 대하여 설치사례를 소개하였다.

• Journal of Practical Agriculture & Fisheries Research
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• v.23 no.1
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• pp.59-66
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• 2021

This study aimed to a basic research for the development of dye-sensitized solar cells that the wavelength band required for crop growth is passed, and the wavelength band that is not necessary for crop growth can be used for the generation of electricity. The transmissivity according to the illuminance was about 10% higher in the Blue filter and the Green filter than in the Red filter, but the transmissivity according to the PPFD was about 10% higher in the Red filter and the Blue filter than in the Green filter. In addition, the greenhouse attached with 30% infrared blocking filter was predicted to have a lower air temperature than other greenhouses, but it was investigated that there was no significant difference. Therefore, it was investigated that the application of the infrared cut filter would not be appropriate in a greenhouse that controls the temperature by opening a window. As a result of investigating, it was found that the Green and Blue filter greenhouses had the severe overgrowth and the stems grew weaker. The fresh weight of paprika in the infrared blocking filter greenhouse was the highest at 678.9g, and the growth of Red filter and the control greenhouses was relatively poor. Photosynthetic rate, amount of transpiration, and stomatal conductivity were the infrared blocking filter and control greenhouse higher than others. On the other hand, the water use efficiency did not show a big difference.

• Journal of Bio-Environment Control
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• v.18 no.3
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• pp.253-257
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• 2009

To analysis effect of environment factors on productivity of sweet pepper according to greenhouse covering material (glass, plastic film), this was investigated. In glasshouse, outside light was positively correlated with yield as that $100MJ{\cdot}m^{-2}$ of outside light increased $300{\sim}500g{\cdot}m^{-2}$, also cumulative temperature was same tendency. On possibility of model development for yield estimate cumulative temperature was high than outside light. According to covering material, leaf photosynthesis, productivity per out-side light and term in glasshouse was more high 13%, 46%, and 47% compared with plastic film house, respectively. Result of analysis of effect of light, temperature, and $CO_2$ on yield, relative yield coefficient, yield increment coefficient, and yield reduction coefficient in glasshouse were more high 25%, 73%, and 34% compared with plastic film house, respectively. Hence, sweet pepper's growing in glasshouse compare with plastic film house had more productivity, but that had more sensitivity to charge of environment factors.

• Journal of Bio-Environment Control
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• v.23 no.2
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• pp.139-143
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• 2014

This study was conducted to investigate the effect of cultivation period and rockwool block size on the growth and early yield of paprika transplants grown in a closed transplant production system. Paprika seeds were sown and germinated in three different size of rockwool blocks ($45{\times}40{\times}35$, $70{\times}70{\times}60$, $100{\times}100{\times}65mm$) and cultivated in a closed transplant production system for 23, 30, and 37 days after sowing. Paprika transplants were cultivated using $100{\times}100{\times}65mm$ rockwool blocks in a greenhouse following a conventional and typical production method for comparing with the growth of paprika transplants grown in a closed transplant production system. Also, we transplanted paprika transplants grown for 23, 30, and 37 days in a closed transplant production system and greenhouse to rockwool slabs and investigated fresh weight of fruits and yield 125 days after sowing. The growth of paprika transplants grown in $70{\times}70{\times}60mm$ rockwool blocks in a closed transplant production system was highest, and the quality of paprika transplant grown in a closed transplant production system was better than in a greenhouse. Rockwool block size and cultivation period in a closed transplant production system did not affect fresh weight of fruits, however, yield was largest when paprika transplants were cultivated using $70{\times}70{\times}60$ and $100{\times}100{\times}65mm$ rockwool blocks for 23 days in a closed transplant production system. These results suggest that decreasing rockwool block size and cultivation period can be strategically used to enhance transplant quality and yield of paprika, as paprika transplants were cultivated in a closed transplant production system.

• Journal of Bio-Environment Control
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• v.22 no.3
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• pp.234-240
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• 2013

The purpose of this study was to provide basic data used in greenhouse design, and for this purpose, the crop loads of tomato and paprika which have high crop load among crops cultivated in greenhouse were measured. The maximum differences in lowest and mean temperatures between cultivation year and normal years for winter season were -5.6 and $-4.9^{\circ}C$, respectively and those for summer season were 3.0 and $1.5^{\circ}C$, respectively. The calibration of push & pull gauge indicated approximate 0.99 of coefficient of determination, representing very high association. The planting densities of paprika and tomato were 3.43, 3.56 and $2.13plants{\cdot}m^{-2}$, respectively. The yields were 4.1, 4.3 and $16.2kg{\cdot}plant^{-1}$, corresponding to 14.1, 15.2 and $34.5kg{\cdot}m^{-2}$ of yield per unit area. The maximum loads were 1.3, 1.5 and $3.3kg{\cdot}plant^{-1}$, respectively. When the paprika were hanged on cross beam, the total crop load applied to it was estimated to be $15.3{\sim}15.9kg{\cdot}m^{-2}$, and when the weights of gutters supporting the cultivation beds, the total weights were $26.0{\sim}26.9kg{\cdot}m^{-2}$.

• The Korean Journal of Mycology
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• v.44 no.3
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• pp.127-131
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• 2016

Unusual mushrooms were observed in strawberry and sweet pepper greenhouses in the Hwasun area of Korea in September 2015. The mushrooms usually grew on beds in the greenhouses, frequently along with vegetables. The identity of the mushrooms in the greenhouses and effects of the mushrooms on the growth and quality of vegetables were investigated. Mushroom specimens collected were identified based on their morphological and molecular characteristics. The mushroom specimens collected from the strawberry greenhouse were identified as Leucocoprinus birnbaumii and L. ianthinus, and those from the sweet pepper greenhouse as Gymnopilus lepidotus. These were the first observations of L. ianthinus and G. lepidotus in Korea. The results revealed that the mushrooms originated from coco peat media used for the beds in the greenhouses. The mushrooms did not affect the growth and quality of the two vegetables.

• Korean journal of applied entomology
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• v.55 no.4
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• pp.405-412
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• 2016

Infestation of adults and pupae of sweetpotato whitefly, Bemisia tabaci, on paprika (Capsicum annuum var. angulosum) grown in greenhouses in Jinju, Gyeongnam province during 2014was determined by counts of the number of target stage of B. tabaci per leaflet. Binomial sampling plans were developed based on the relationship between the mean density per leaflet (m) and the proportion of leaflets infested with less than T whiteflies ($P_T$), according to the empirical model $(({\ln}(m)={\alpha}+{\beta}({\ln}(-{\ln}(1-P_T))))$. T was defined as the tally threshold, and set to 1, 2, 3, 4, 5 (adults) and 1, 3, 5, 7 (pupae) per leaflet in this study. Increasing the sample size, regardless of tally threshold, had little effect on the precision of the binomial sampling plan. Based on the precision of the model, T = 1 was chosen as the best tally threshold for estimating densities of B. tabaci adults and T = 3 was best tally threshold in B. tabaci pupae. Using the results obtained in the greenhouse, a simulated validation of the developed sampling plan by RVSP (Resampling Validation for Sampling Plan) demonstrated the plan's validity. Above all, the binomial model with T = 1 and T = 3 provided reliable predictions of the mean densities of B. tabaci adults and pupae on greenhouse paprika.

• Horticultural Science & Technology
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• v.34 no.3
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• pp.424-432
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• 2016

This experiment was carried out to compare growth and fruit setting characteristics in ten winter-planted paprika (Capsicim annuum L.) cultivars. Five red line paprika cultivars ('Maduro', 'Maranello', 'Nagano', 'Sirocco' and 'Special') and five yellow line paprika cultivars ('Coletti', 'Sven', 'Thialf', 'Volante' and 'Zagato') were used for this study. The experiment was performed for 42 weeks, from winter of 2013 to autumn of 2014. Based on the growth stages of paprika, growth characteristics were investigated six times, and each investigation was categorized from group 1 through group 6. The relative internode ratio showed a normal range at the early growth stage, but tended to gradually decline as growth progressed. This trend was greater in red line paprika than in yellow line paprika. Among the cultivars used for this experiment, 'Special' and 'Zagato' showed growth inhibition, whereas 'Maranello' and 'Volante' kept a balanced growth during summer cultivation. The fruit set percentage in yellow paprika was 10.8% higher than in red paprika, while the number of branches in yellow paprika was 4.1% less than in red paprika. When measured after the full fruiting age, from June to July, the number of fruit set in group 4 was much lower in 'Sirocco' and 'Coletti' than in any of the other cultivars, indicating that they were more sensitive to the growth environment during the rainy season. These findings suggest that 'Maranello', 'Nagano', 'Sven', 'Thialf', and 'Volante' could be effectively used for summer cultivation in a high-plastic-film greenhouse, and 'Maranello', 'Special', 'Volante', and 'Zagato' could be good candidates for a low-plastic-film greenhouse.