• Journal of Bio-Environment Control
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• v.25 no.1
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• pp.71-75
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• 2016

The experiment was carried out to examine the effects of planting date on the growth and marketable yield of bitter gourd grown in rain-shield plastic houses. Bitter gourd cv 'Dragon' seedlings were separately transplanted during the months of June, July and August, 2015. The training method of all plants was made with four lateral vines and pinching the main vine. Lateral length of plants exhibited no significant difference between each planting date. However, bitter gourd planted in June had significantly higher main stem diameter than those treatments planted on August. The application of planting date was found effective in increasing marketable yield and number of fruits. June, as a planting date, had the highest marketable yield (6,439kg/10a), whereas bitter gourd planted in August had the lowest yield (870kg/10a) which were also consistent in terms of the number of fruits. Fruit length and diameter had no significant differences as affected by treatments. Therefore, planting date of bitter gourd in June was effective in increasing yield of fruit in rain-shield plastic house conditions.

• Journal of Bio-Environment Control
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• v.23 no.1
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• pp.43-49
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• 2014

This study was designed to determine the effect of red LEDs during healing and acclimatization process on the survival rate and quality of grafted tomato seedlings. Red LEDs and no light (darkness) were used for treating three rootstock cultivars, which are 'B-Blocking', 'Kanbarune', 'High-power' in healing room. Results showed that survival rates of grafted seedlings in red LEDs were higher than those in no light treatment. Significant variation on survival rates of rootstock cultivars was observed in no light treatment but there was not significant variation in red LEDs treatment. Light treatment also reduced the percentage of infected plants, except for the 'Kanbarune' cultivar. Seedling quality in red LEDs was better than that in no light treatment by improving growth parameters such as plant height, leaf length, leaf width, leaf area, fresh and dry weight of shoot and root. Light treatments and rootstock cultivars did not affect number of leaves, leaf chlorophyll value and T/R ratio of seedlings, but seedlings in red LEDs were significantly more compact than those in no light treatment. Moreover, the root morphology of seedlings such as total root surface area, total root length, and number of toot tips in red LEDs was also greater than that in no light treatment.

• Journal of Bio-Environment Control
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• v.14 no.4
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• pp.245-253
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• 2005

This study was carried out to determine the optimum EC supply by accumulation amount of solar radiation in closed system. EC concentration of drainage was higher than that of supply. The higher EC concentration of supply was, the lower pH of drainage was. It was no difference in the quality of cut rose 'Nobles' (Rosa hybrida), stem length, stem diameter, leaf number, petal length, and petal diameter by EC treatment by season. The yield was higher about $6\%$ in treatment of EC $1.3dS{\cdot}m^{-1}$ in April and May, about $10\%$ in treatment of EC $10dS{\cdot}m^{-1}$ in June, July and August, and about $10\%$ in treatment of EC 1.0 or $1.3dS{\cdot}m^{-1}$ in September and October than the others. In general, the yield of the cut rose was higher in treatment of (B) EC 1.3 mS/cm in spring, EC $1.0dS{\cdot}m^{-1}$ in summer, EC $1.3dS{\cdot}m^{-1}$ in autumn, and EC$1.6dS{\cdot}m^{-1}$ in winter.

• 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).

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.26 no.2
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• pp.105-112
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• 2020

As sprout vegetables of interest growing, its maintaining the quality of the technology was needed to solve the problem of increasing growth and maintain quality after harvest. This experiment proved that the quality of radish sprout vegetable was affected by CO₂ treatment during cultivation. Thus, the effect of CO₂ treatment during cultivation on postharvest quality of radish sprout vegetable was investigated in terms of the quality changes in weight loss, gas partial pressure, SPAD, hue angle external appearance during storage at polypropylene film (thickness 30 ㎛) at 10℃. CO₂ treatment used the way to gas with 700 ppm or carbonated water with 700 ppm and 1,400 ppm. The study revealed that growths on CO₂ treated plant were more than those of non-treatment on stem length. After harvesting, the CO₂ treated plant and control growing little different characteristics on fresh weight, plant length and so on. However, there were no differences between the CO₂ treated plant and control on the Fv/Fm and SOD (superoxide dismutase). In gas partial pressure, the O₂ consumption and CO₂ accumulation of the CO₂ treated plant tended to be more than that of non-treated plant. This study also checked that after packaging, the effects of CO₂ treatment during cultivation on the quality of radish sprout vegetable was not significant. However, there were tended to CO₂ treatments were lower value compared to control on SPAD, hue angle and general appearance. CO₂ treatments of radish sprouting vegetable before harvest were improve growth of stem length, but ones were not improving the maintain of quality on radish sprout vegetable during shelf-life period. The results indicated that CO₂ treatment only affected stem elongation until radish sprout vegetable its growth.

• Journal of Bio-Environment Control
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• v.29 no.4
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• pp.313-319
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• 2020

This study was conducted to find proper material of brushing stimulation for height suppression of tomato plug seedlings. The tomato seeds were sown in 40-cell plug tray filled with commercial seedling medium and brushing stimulation was started at 18 days after sowing. Acrylic, polypropylene film, and weaving film were used by materials of brushing stimulation and, non-treatment and diniconazole treatment were used as the control. In acrylic treatment, the plant height was the shortest and the stem diameter was the thickest. Leaf growth was the lowest in diniconazole treatment. However, the SPAD value was the greatest in diniconazole treatment. The dwarf rate was the greatest in acrylic treatment. In acrylic treatment, the T/R ratio was the lowest and compactness was the greatest. In conclusion, use of the acrylic as material for brushing stimulation has higher dwarf rate than diniconazole treatment, and has advantages height suppression and seedling quality.

• Journal of the Korea Organic Resources Recycling Association
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• v.1 no.2
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• pp.237-258
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• 1993

Objectives in this study are to stabilize the organic sludges which were produced from papermill wastewater, nightsoil treatment facilities and utilized as foods for earthworm, to find the method for using the cast which was orginated by earthworm as fertilizer, and ultimately to develop the practical technique to solve the environmental problems by optimization of wastes treatment. The results of this study were summarized as follows. In the investigation for fertilizer effect of cast, germination rates of cucumber, tomato, and cabbage were investigated. The germination status of 3 types of plants was excellent as over 90% in the combination case of 30-45% cast. In the investigation for fertilizer effect of cast derived from nightsoil sludge, the growing status of cucumber, tomato, and cabbage was excellent in the combination case of 30-45% cast. In the experiment for fertilizer effect investigation of cast derived from papermill sludge, the growing status of cucumber, tomato, and cabbage was excellent in the combination case of 30-45% cast. Also, in the combination case of 60% cast, plants growth was not disturbed.

• Journal of Bio-Environment Control
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• v.7 no.1
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• pp.25-33
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• 1998

Root zone temperature have influenced on protected cultivation in winter season. Especially root zone temperature is acted on limiting factor in crop cultivation. This study was conducted to obtain optimum temperature of root zone in Protected cultivation Root zone was warmed by heated water($28^{\circ}C$) flowing through the PPC pipe(${\phi}15$) buried depth 40 cm. And the flowing water was heated by solar system. Minimum air temperature during night time was set at $14^{\circ}C$ and maximum air temperature during day time was set at $28~30^{\circ}C$ the growing period of cucumber was from Nov. 6, 1996 to Jan. 30, 1997. The results are summarized as follows. 1. Average soil temperature at 15~20 cm depth was $22^{\circ}C$ at warming plots, $17~18^{\circ}C$ at non-warming plots 2. Early growth in leaf length, stem diameter, number of leaves and leaf area for 30 days after planting were accelerated by root zone warming. Especially, the grawing rate of soil warming plots was higher 27% in leaf length, 51% in leaf number, 150% in leaf area than non-warming Plots. Above-ground and underground part of warming plots was higher 117%, 56% than non-warming plots. 3. In total yield analysis, number of fruits were 614 in soil warming and 313 in non-warming plots. In the result, total yield of soil warming plots was increased with 196% than non-warming plots. 3. In total yield analysis. number of fruits were 614 in soil warming and 313 in non-warming plots. In the result. total yield of soil warming plots was increased with 196% than non-warming plots.

• Proceedings of the Korean Society of Organic Agriculture Conference
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• 2009.12a
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• pp.288-288
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• 2009

WTO가 진행되고 한미 FTA 협상타결로 농업농촌이 어려움을 격고 있으며 EU, 중국, 인도 등과의 FTA 협상도 검토되고 있다. 또한 소득수준 향상으로 소비자들이 웰빙 건강식품에 대한 관심이 고조되면서 이제는 농산물의 안전성과 기능성, 맛 등이 우수한 고품질 안전농산물 생산이 농업의 핵심과제로 대두되고 있다. 이와 같이 급변하는 농업여건에 대응해 나가기 위해서는 농업정책의 최우선과제인 친환경농업에 적극 동참하여 안전하고 우수한 농산물을 생산해야 할 것이다. 잎들깨의 재배에 있어 주생산 요소의 한 가지는 영양생장을 잘 조절해야 하고 기비보다는 추비에 보다 많은 기술이 요구되고 있다. 이에 본 연구의 목적은 잎들깨 추비시용에 있어 화학비료를 대체 유기질 비료를 이용하여 추비수준별 생육 및 수량성을 구명 하는데 있다. 재배방법은 재식거리는 10 cm${\times}$7cm(137,500주/10a) 로 하였으며 기비는 유기질비료(N-P-K=3.2:4.2:1.1)를 N량 기준으로 5.2kg/10a 을 시용하였다. 추비시용 처리는 10a당 N 0kg, N1.2kg, N1.5kg, N 1.8kg 등 4처리를 두었으며, 추비는 유기질 비료 (N-P-K=4.0-2.0-1.5)를 N 기준으로 생육에 따라 매회 수확 후에 시용 하였으며, 시용 방법에 있어 관수는 1 회 급여시 유기질 비료를 10a당 물 5톤에 희석하여 총 5회를 주었으며 관수방법은 점적호스를 이용하여 저면 관수 하였다. 재배기간 중 10a당 T-N 시용량은 N 0kg 재배는 5.2kg, N 1.2kg 재배는 11.2kg, N 1.5kg재배는 12.7kg, N 1.8kg재배는 14.2kg을 시용하였다. 재배 후 처리별 N 흡수량은 N 1.8kg구 33.1kg, N 1.5kg구 30.0kg, N 1.2kg구 25.7kg, N 0kg구 18.1kg순으로 나타났다. 생육은 초장, 경경, 엽장, 엽폭, 엽중은 추비 시용량이 높을수록 향상되었고, 마디수 발생은 추비 수준 간 변동이 없었다. 병해충 발생정도는 병은 시들음병, 역병, 노균병 순으로 발생하였고, 충은 잎말이나방, 잿빛곰팡이, 진딧물 순으로 발생되었다. 수량성은 N 1.5kg 재배구가 N 1.2kg 대비 115%, N 0kg 대비 169%를 수확하여 타 처리에 비해 비교적 높게 나타났다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.15
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• pp.69-75
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• 1974

This experiment was conducted to investigate the influence of different amount of nitrogen and deficiency of soil moisture on yield components of soybean. Soybean were seeded on 1/2000a wagner pot. Deficiency of soil moisture was treated at each growth atage of soybean. 1.In case of deficiencyt of soil moisture at the flowering time in the plot of non-nitrogen(NO D3), the growth duration of soybean was shortened about three to four days. 2. The leaf area was greatly affected by the influence of both treatments till 49days after germinating. 3.The increase of stem height, stem doameter,number of branches and lengeh of the branches came to an end about 70 days after seeding. These growing condition of tje soybean were lowest the plot of No D$_1$,in which the frowth of the soybeans were poor at the early stage. 4.The number of pods was not increased by the increase of fertilizing nitrogenous fertilizer. The number of pods was much decreased by the influence of soil mousture deiciency, and under this condition, the proportion of main stem pods and two or three grain pods was high. 5.The 3rd and 4h nodes and the 10th to 12th nodes from bottom had more pods than the other nodes had, but of the plants had grown well, they had more pods on the 3rd and 4th nodes, but if the plants had grown poorly, they had more pods on the 10th to 12th nodes. 6.The content of protein in the soybean was low at the plit of N。D$_4$which had not heavy weight of 100 grains, and the content of oil in the soybean was low in the plot in which each plant had a small number of grains.