• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1997.05a
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• pp.5-10
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• 1997

본 실험은 온실멜론을 암면재배하여 수분전후 21일간 질소공급제한이 생육, 품질 및 양분흡수에 미치는 영향을 조사하였다 가을과 겨울재배에서는 상당히 고농도의 양분을 흡수하는 시기이기 때문에 시즈오카대 처방(NO$_3$-N = 8me/$\ell$)을 이용하여 재배하고 양분도 제한했기 때문에 식물체는 양분부족 현상을 야기하였다. 교배 후 양분흡수를 제한하는 경우 상위엽의 과잉비대를 방지하였으나 초장과 과실의 생체증은 양분공급을 제한하지 않는 경우에 크게 나타났다. 그 원인은 양분공급을 제한하는 기간 및 시기와 시용배양액 농도 차이에 따른 양분흡수량의 차이라고 생각되었다. 이상으로부터 수분기에는 양분흡수량이 많기 때문에 양분공급을 제한하지 않고 양분공급을 증가시키는 편이 과실의 외관, 품질향상 및 과실의 당도향상에 상당히 기여할 것으로 생각되었다.

• Journal of Bio-Environment Control
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• v.13 no.2
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• pp.81-89
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• 2004

This study was conducted in a commercial plug glasshouse in Sacheon to examine the possibility of producing tomato plug seedlings using various growing media containing cellular glass foam (CGF)and carbonized chestnut woodchips (CCW) as medium components. Plug seedlings of 'Seogun' tomato were grown in media containing 50% CCW＋50% peatmoss, 33% CGF＋67% peatmoss, and 50% peatmoss＋50% granular rockwool. A commercial plug medium (Tosilee) was used as the control. All seeds were sown in 200 cell plug trays on November 28, 2001. Seedling growth was measured at 31 days after sowing. Each treatment showed a similar growth result as compared to the control. Plant height, root grade, fresh weight, and air space and bulk density of the medium were significantly greater in the 33% CGF＋67% peatmoss treatment than those in the other media. However, growth was slightly suppressed in the 50% CCW＋50% peatmoss. pH and EC of the media were the highest in the control treatment, although no toxicity symptoms had been observed. The results suggest that perlite can be replaced with a new material such as CGF in the commercial scale production of plug seedlings of 'Seogun' tomato.

• Journal of Bio-Environment Control
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• v.11 no.4
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• pp.199-204
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• 2002

To overcome a decrease of Korean ginseng production caused by successive cropping, we have tried to develop a nutrient culture system for Korean ginseng production. For determining the optimal substrate, mixture of sand and TKS-2 (S＋T), peatmoss (P), reused rockwool (RR), and granular rockwool (GR) were investigated. The overall physico-chemical properties of RR fell into the reported optimal range for the ginseng cultivation. However, bulk density of S＋T was a little higher than that of soil in Korean ginseng fields. The top fresh weight of the ginseng was high in RR and S＋T substrates. The root fresh and dry weights in the RR were remarkably greater than that in the conventional soil (CS) of Korean ginseng fields. In terms of ginseng quality, the vitamin C content of ginseng root in nutrient culture was higher than that in CS. However, the contents of crude saponin and total ginsenosides in ginseng between in the nutrient culture and in the soil culture did not show any significant differences.

• Journal of Bio-Environment Control
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• v.27 no.1
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• pp.13-19
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• 2018

This study was conducted to examine the germination and growth during seedling period of Codonopsis lanceolata and Astragalus membranaceus as affected by different media. The seeds were sown in commercial medium (Tosilee), coir, rockwool, and urethane sponge. The seeds were germinated for 22 days in a closed-type plant production system, and seedlings were grown for 35 days after sowing in the venlo-type glasshouse located on Gyeongsang National University. Nutrient solution was supplied by the sub-irrigation as EC $1.0dS{\cdot}m^{-1}$ and pH 6.5 every second day. Final germination of Codonopsis lanceolata was the significantly highest in the coir and rockwool media as 68.5% and 67.9%, respectively. Mean daily germination was also the highest in the coir and rockwool media as 4.2 and 4.1, respectively. The germination rate of Astragalus membranaceus was not significantly difference in the media types. Plant height and leaf area of Codonopsis lanceolata were the significantly highest in the rockwool medium as 11.5 cm and $11.3cm^2$, respectively. Longest root length and fresh weight of root were the greatest in the coir medium as 5.8 cm and 0.07 g, respectively. Plant height and leaf area of Astragalus membranaceus were the significantly highest in the coir medium as 14.0 cm and $16.9cm^2$, respectively, and fresh and dry weights of root were the highest in the urethane sponge medium as 0.34 g and 0.03 g, respectively. Therefore, these result suggest that the rockwool and coir media were suitable for the germination and growth during seedling period of Codonopsis lanceolata and Astraglus membranaceus.

• Korean Journal of Environmental Agriculture
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• v.9 no.1
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• pp.53-59
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• 1990

Root zone environments in hydroponics are very important factors in crop growth, development and quality. In Korea, improvement of root zone temperature is required because of the continental climate. Therefore, this investigation was carried out to clarify the difference of root zone environments in different hydroponic systems under different climates. Tomato plants were grown in nutrient solutions at Seoul City University and Allen Cooper's. Hydroponic systems in this experiment were aeroponics, nutrient film technique(NFT), rockwool culture, sand culture and smoked rice hull culture(SRH). The decrease in temperature rapidly occured in sand culture while slowly in rockwool culture in low air temperature periods. The internal temperature of substrates of hydroponic bed were slightly changed in rockwool culture under high air temperature periods, while the duration of high temperature was longest in NFT. Electrical conductivity and pH of nutrient solution showed great changes in rockwool and aeroponics. Along the bed, the content of dissolved oxygen in nutrient solution had a tendency to decrease in NFT and DFT(Deep flow technique), while didn`t a change with aeroponics. Root activity measured by triphenyl tetrazolium chloride (TTC) was highest with aeroponics, followed by rockwool culture and NFT.

• Journal of Bio-Environment Control
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• v.15 no.3
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• pp.239-243
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• 2006

This research compared growth and flowering of potted $Viola{\times}wittrockiana$ 'Majestic GT Scarlet Shadow' in various mixtures of recycled perlite and cellular glass foam (CGF). The crop was cultured in a mat subirrigation system. Numbers of leaves, opened flowers, flower buds, and branches, fresh and dry weights of shoot, leaf area, and total chlorophyll concentration were the greatest in plants grown in the medium of used perlite + granular rockwool+ peatmoss (25:50:25, v/v/v). Plant height and length of the longest root were the highest and longest, respectively, in plants grown in the medium of CGF+peatmoss (25:75, v/v). The medium of CGF+peatmoss (25:75, v/v) was better than the medium of used perlite+peatmoss (25:75, v/v) in plant growth. The medium of CGF + granular rockwool (25:75, v/v) was poorer than the medium of recycled perlite + granular rockwool (25:75, v/v).

• Journal of Bio-Environment Control
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• v.16 no.1
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• pp.40-46
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• 2007

This study was conducted to clarify the effects of the different substrates in terms of perlite (100%), peat moss (100%), granular rock wool (100%) and mixing perlite (50%) with peat moss (50%) on the growth responses and mineral contents of hydroponically grown Plantago asiatic in aggregate culture. Overall early plant growth such as plant height, stem diameter, number of leaves, root length, fresh and dry weight of shoot and root were increased in the order of that miked perlite and peat moss (50%:50%, v/v)>peat moss (100%)>granular rock wool (100%)>perlite (100%). Ca and Mg contents in plants became highest in the plants grown in the peat moss, however, Mg and Na in the granular rock wool. $P_2O_5$ content in plants were most increased in proportion to the plant growth increment in the peat moss (100%) and the mixing substrates of perlite and peat moss (50:50, v/v).

• Journal of Bio-Environment Control
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• v.29 no.3
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• pp.245-251
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• 2020

This study was conducted to investigate the seedling qualities and growth of paprika according to various irrigation points (IPs) (30, 40, 50, 60 or 70%) compared to the weight of rockwool cube with 100% water content for raising seedlings of paprika. Growth degree of paprika seedlings was positively correlate with various irrigation points. In particular, paprika seedlings with IP 30-40% and IP 50-70% treatments were significantly higher than those with other treatments. Leaf area of seedlings was 50-100% wider in those with IP 50% and IP 40% treatments than those with other treatments, therefore dry weight was heavier in IP 30-60% treatments. The dry weight of more than IP 50% treatments had no significant differences. Leaf area (Y₁) had a significant relation with the irrigation point (x) as Y₁ = 48.311x + 133.7 (R² = 0.9116^⁎⁎). Also dry weight (Y₂) of the seedlings showed a linear regression equation as Y₂ = 0.1584x + 0.8616 (R² = 0.8853^⁎). Considering the leaf area and the dry weight of irrigation points for rising seedlings of paprika in this study, the optimum range of the irrigation points in the water contents of rockwool cube is IP 50%.

• Journal of Bio-Environment Control
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• v.20 no.4
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• pp.320-325
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• 2011

This experiment was conducted to study the effects of germination condition, nursery media and nutrient concentration in plant factory on the growth characteristics of pak-choi and lettuce seedlings. The results showed that temperature (15, 20, $25^{\circ}C$) and light conditions (lighting and no lighting) had no significant effect on germination rate of pak-choi and lettuce, whereas the interaction of growing media (rockwool and urethane sponge) and moisture management before and after sowing had significant effect on germination percentage. In case of no moisture management before and after sowing, germination percentage was much higher in rockwool medium than urethane sponge medium. But germination percentage of urethane sponge was higher than that of rockwool with applying moisture before and after sowing. At the nutrient concentration of EC $1.0dS{\cdot}m^{-1}$ the fresh weight of pak-choi was heavier than in EC 1.5 and $0.5dS{\cdot}m^{-1}$ by 1.8 and 6.0 times, respectively. At the nutrient concentration of EC $1.0dS{\cdot}m^{-1}$ the fresh weight of lettuce was also heavier than in EC 1.5 and $0.5dS{\cdot}m^{-1}$ by 1.7 and 3.5 times, respectively.

• Proceedings of the Korean Society of Crop Science Conference
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• 1992.05a
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• pp.80-81
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• 1992