• Korean Journal of Organic Agriculture
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• v.7 no.1
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• pp.105-113
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• 1998

This study was conducted to clarify the effects of various rhizobacteria in the root zone in terms of Azospirillum sp., Rhodopseudomonas sp., Pseudomonas sp., fusant of Bacillus sp. and Corynebacterium glutamicum on the growth of hydroponically grown cucumber plants. Densities in bacterial cells of fusant of Bacillus sp. and Corynebacterium glutamicum at different substrates were in the order of cocopeat > rockwool > nutrient solutions at 4 days after bacterialization. Plant growth promoting effects of the various rhizobacteria on the growth of hydroponically grown cucumber plants were in the order of Azospirillum sp. > Rhodopseudomonas sp. $\ge$ fusant of Bacillus sp. and Corynebacterium glutamicum > Pseudomonas sp. > control.

• Journal of Ginseng Research
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• v.36 no.4
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• pp.425-429
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• 2012

In this study, hydroponically-cultivated ginseng leaves, fruits, and roots were respectively extracted with ethanol. The contents of 12 ginsenosides and three phenolics in the extracts were quantitatively analyzed and the free radical scavenging activities were measured and compared. Hydroponically-cultivated ginseng leaves contained higher levels of gensenosides (Rg1, Rg2+Rh1, Rd, and Rg3) and p-coumaric acid than the other parts of the ginseng plants. The 2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid radical scavenging activities of leaves were also the highest. Accordingly, hydroponically-grown ginseng leaves were shown to hold promise for use as an environmentally-friendly natural anti-oxidant.

• Korean journal of food and cookery science
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• v.17 no.5
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• pp.510-516
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• 2001

Hydroponic cultivation is a technology of raising crops without use of soil. Generally farmers use the method of DFT(deep flow technology)to grow leafy or fruity vegetables; however, systematic and scientific researches are insufficient on this matter. This study investigated the possibility of cultivating Chinese cabbage steadily year long by using the method of DFT. Chinese cabbage was cultivated hydroponically with and without Ge addition, used to prepare kimchi, and the chemical and microbiological characteristics of kimchi were compared. The basic hydroponic cultivation condition was as follows: 30 days after seeding, the raised seeds were moved to a hydroponic bed and given underground water for 3 days so the roots grow normally Standard nutrient solution was provided and the early electric conductivity concentration was maintained between 1.5∼2.5 thickness. The temperature of the solution was maintained between 10 ∼25$^{\circ}C$ to allow the growth of Chinese cabbage. When soil-cultivated, organically cultivated and hydroponically cultivated Chinese cabbages were compared, hydroponically cultivated cabbages were smaller in size and showed less ability to build up and fold leaves into a head, but showed better quality than organically cultivated cabbages. The contents of protein and fat showed no significant differences. The contents of water. Ca, P, Fe, Vitamin A and Niacin were higher in control and Ge-added cabbages compared with soil-grown cabbage. There was no difference between soil-cultivated Chinese cabbage kimchi and hydroponically cultivated Chinese cabbage kimchi.

• Journal of Bio-Environment Control
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• v.4 no.2
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• pp.159-166
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• 1995

This experiment was aimed to investigate the growth and yield responses of hydroponically grown cucumber as affected by cultural containers and substrates using perlite and mixtures with perlite. Containers used in this experiment were bed and box made of styrofoam, PE film and Wagner pot and substrates used were perlite, peatmoss, rice hull and carbonized rice hull. The results obtained were as follows : Based on the growth and yield responses determined from the leaf area and total fruit weight, bed and box made of styrofoam was considered the best containers among tested for cucumber hydroponics. Recommendable substrates for hydroponically grown cucumber using perlite were evaluated in the order of perlite, perlite with rice hull and perlite with carbonized rice hull in styrofoam bed and box. Increase in marketable yield and decrease in abnormal fruits was observed in the mixed substrates with rice hull or carbonized rice hull when compared to perlite single media.

• Journal of Bio-Environment Control
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• v.14 no.1
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• pp.63-67
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• 2005

This study was conducted to investigate the effect of remained leaf number on leaf, stem and root growth of leaf lettuce (Lactuca sativa L. var. Chungchima). Plants were grown hydroponically in $0.45\pm0.15\pm3.0m$ growth channels using a recirculating DFT (Deep Flow Technique) system. The growth response to remained leaf number was evident in leaf and stem than root of leaf lettuce. Leaf fresh weight increased and leaf quality was lowered with increasing of remained leaf number. Results indicate that 4 to 6 leaves could be optimum remained leaf number of hydroponically grown leaf lettuce.

• Journal of Bio-Environment Control
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• v.8 no.4
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• pp.265-274
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• 1999

This experiment was carried out to investigate the effect of container size and substrate volume on the growth and fruit yield of hydroponically grown cucumber(Cucumis sativus L.) plants. Seeds were sown in plug tray filled with coir dust on Feb. 13, 1998. Seedlings with 5 to 6 true leaves were transplanted in $2{\ell},\;4{\ell},\;6{\ell},\;8{\ell}\;and\;10{\ell}$ plastic pots filled with perlite. Cucumber fruits were harvested with 1 to 2 days interval, and fresh weight, number of normal and malformed fruit were recorded. Plant height, stem diameter, number of leaves and leaf area were highly depended on the container size. Total fresh weight and the number of fruit were increased with increasing container size. NAR(net assimilation rate) and CGR(crop growth rate) increased also with increasing the container size. Optimum container size for hydroponically grown cucumber plant using perlite was recommended as $8{\ell}$ per plant.

• Journal of Bio-Environment Control
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• v.5 no.1
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• pp.65-70
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• 1996

Water potential which is an physical chemistry and thermodynamic indicator expressed water status of plant root, stem and fruit could be use as a useful indicator for growth control of hydroponically grown muskmelon plant. Linear relationship was observed between EC and water potential of nutrient solution, consequently increment of EC related to the decreasing water potential and resulted with the alteration of water potential and solute potential of upper leaves. Rapid reduction in growth was observed in over 5${\mu}{\textrm}{m}$ of Cu concentration in the media and same tendency was recorded in the shoot fresh weight, root dry weight and chlorophyll content. Increment of Cu concentration in the nutrient solution leads to lower the growth rate and then the water potential of upper leaves. Turgor pressure was not affected the growth of hydroponically grown muskmelon and also Cu concentration of nutrient solution was not recognized the direct relationship to the growth characteristics of muskmelon. These results demonstrated that water potential of nutrient solution can be use as an useful indicator for water physiological comparison of plant growth in hydroponically grown muskmelon.

• Journal of Bio-Environment Control
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• v.13 no.3
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• pp.130-134
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• 2004

Experiments were conducted to evaluate quality and vase life of cut rose ‘Rote Rose’ cultivated either in soil or hydroponically in rockwool. Rose stems were put in four different preservative solutions, 0.5% chrysal RVB, BS (2% sucrose + 200 mg. L$^{-1}$ 8HQS + 0.3% Chrysal RVB), Sonk1 (BS + 0.1 mM ethionine), and double distilled $H_2O$. Flower stems were displayed at $20\pm1^{\circ}C$, RH 60%, and light intensity of $8.1\mu$mol.$m^{-2}$ .$s^{-1}$ provided by fluorescent lamps for 16 hㆍ$d^{-1}$ Fresh weight and flower diameter during vase life were affected by cultivation method and were greater in hydroponically-grown roses than in soil-grown roses. Among preservative solutions, BS and Sonkl were superior to Chrysal RVB in terms of extending vase life. Vase life of cut rose in Chrysal RVB, BS, and Sonkl over the control was prolonged by about one day.

• Korean Journal of Organic Agriculture
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• v.7 no.1
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• pp.129-135
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• 1998

This study was conducted to clarify the plant growth promoting effects of the various rhizobacteria on the growth of hydroponically grown tomatoes in rockwool, perlite and cocopeat cultures. Strains in terms of $Azospirilham\;sp.(4.5{\times}10^7cells/g),\;Rhodopseudomonas\;sp.(5.8{\times}10^5cells/g),\;Pseudomonas\;sp.(6.1{\times}10^6cells/g$), fusant of $Bacillus\;sp.\;and\;Corynebacterium\;glutamicum(9.1{\times}10^5cells/g$) was bacterialized into the root zone of tomatoes before sowing. Overall growth of tomato plants was promoted by bacterialization of the various rhizobacteria. Strains which showed the highest plan growth promoting effects of hydroponically grown tomatoes was Azospirillum sp., and optimum cultural substrates for the plant growth promotion by rhizobactera were in the order of cocopeat > perlite = rockwool cultures.

• FLOWER RESEARCH JOURNAL
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• v.17 no.3
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• pp.172-178
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• 2009

This experiment was conducted to elucidate the proper suppling frequency of nutrient solution for grafted cactus Gymnocalycium mihanovichii var. friedrichii grown hydroponically without medium. Grafted cactus seedlings were planted onto the cultivation bed without medium, using labor-saving tray. The treatments like 1, 3, 5 and 7 times of nutrient solution supply per day and continuous soaking of plant root in the nutrient solution during the daytime were tested in summer and winter season. The growth of grafted cactus was worst in the treatment of one time supply of nutrient solution per day, and there were not significant difference in growth of grafted cactus among other treatments both in summer and winter season. 17.6% of grafted cactus seedlings failed to rooting in the treatment of one time supply of nutrient solution per day in winter season. The proper suppling frequency of nutrient solution, for the grafted cactus Gymnocalycium mihanovichii var. friedrichii grown hydroponically without medium, was three times supply of nutrient solution per day both in summer and winter seasons considering growth and rooting of plants.