• Horticultural Science & Technology
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• v.18 no.1
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• pp.9-13
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• 2000

Cultivation of onions in Korean peninsula is so restricted to Southern region, mainly due to inadequate air temperature for the growth of onions in this region. This sometimes resulted in unstable supply of onions. The fluctuation of market prices mainly results from the limited production of onions in such restricted areas. Onions are usually transplanted at the end of fall and cultivated until the beginning of next summer. This study was designed to examine the possibility of extending production region of onions by adopting the plug seedling system, and the effects of plug seedling age, transplanting date, plug cell volume, and variety on the yield of onions were investigated. Transplanting date (Mar. 15 or Apr. 15) did not affect the yield of onions. However, 60-day-old seedlings produced significantly greater bulb yield (107.2 ton/ha) than those of 30- or 90- day-old seedlings. Bulb yields of seedlings raised in 128 and 72 cell trays were 125.0 and 120.8 ton/ha, which were significantly greater than those in other cell trays. Yield of seedlings raised in 406 cell trays was the lowest. Seedlings of mid-late 'Chenjuwhang' yielded 130.5 Ton/ha, which was significantly higher than those of other varieties. Considering the rainy season during early summer, we suggest that seedlings of onions raised for 60 days and transplanted on Mar. 15 should be advantageous in producing of marketable bulbs and that an early 'Yongbongwhang' should be the best variety.

• Food Science and Preservation
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• v.14 no.2
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• pp.124-130
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• 2007

Lettuce (Lactuca Sativa L.) is the most popular salad vegetable crop The purpose of this study was to analyze the quality of lettuce, and residual pesticides in this vegetable, during growth after transplanting. The eatable weight was 40% of the total weight at the commencement of transplanting, but had doubted at harvest after transplanting. As lettuce grew after transplanting, the pH, the sugar level, and the moisture content increased slightly, and the color tended towards yellow rather than greenThe SPDA chlorophyll measurement was 16.84 at 42 day post-ransplantation, and increased to 26.44 at 67 day after transplanting. The contents of vitamin C were 2.5mg/100g wet weight at 60 d after transplantation, but decreased to 2.2mg/100g wet weight 67 day post-transplantation. Mineral (Ca, Fe, K, Mg, and Na) levels rose after transplantation, and attained their highest levels 60 day post-transplantation. The lettuce crop was analyzed for residues of each of 48 pesticides nt 54 after transplantation, and the only such chemical detected was chlorthalonil(0.03 0.25mg/kg wet weight).

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.251-256
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• 2021

This study aimed to compare the growth and production of paprika (Capsicum annuum) planted directly on a coir substrate slab according to the bending methods. The existing root direction was bent to 0° (I-type), 90° (L-type), and 180° (U-type), respectively. The weekly average growth such as stem length, diameter, and leaf area tended to be the highest in the I-type bending, but there was no statistical difference. Root weight at 46 weeks after planting was also about 1.3 to 1.7 times heavier in the I-type than the L- and U-type bending. As the yield produced by 330 plants by bending methods, the initial yield was the highest in the U-bending, but then the highest in the I-bending. Accordingly, the total yield was the highest in I-bending. Consequently, when planting on coir substrates directly in paprika cultivation, the I-type bending should be considered most suitable for securing root and plant vigor in the early stages of planting and for enhancing fruiting stability.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.59-59
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• 2019

벼룩이울타리(Arenaria juncea M.Bieb.)는 7~8월에 백색의 꽃이 취산화서로 아름답게 피며, 산지, 산비탈 또는 메마른 초지에 자생한다. 청열 및 양혈의 효능이 있고, 은시호의 대용으로 쓰이며, 뿌리에는 triterpenoid saponins과 sapogenin이 함유되어 있다. 본 연구는 분화용 식물로 벼룩이울타리를 활용하기 위한 효율적인 포트 정식방법을 개발하기 위하여 수행되었다. 실험은 2018년 선행연구에서 생산된 유묘를 7월 2일에 정식하여 10월 15일까지 약 15주 동안 재배하였다. 대조구는 플라스틱 화분 10호($9{\times}9cm$)에 원예상토를 충진하고 200구 트레이에 셀 당 4립씩 파종하여 생산된 1셀을 정식하였다. 재배 실험은 용기종류[비닐포트(3, 4치), 플라스틱 포트(8, 10, 12호)], 토양 종류[원예상토, 중화 피트모스:펄라이트(3:1, 4:1), 마사토:중화 피트모스(2:1, 3:1)], 묘의 소질[파종 립수(1, 2, 4, 6립), 파종 용기(162, 200, 288구 트레이)] 등을 달리하여 진행하였다. 연구의 결과, 벼룩이울타리는 토양의 양이 많을수록 생육이 양호한 결과를 보여, 플라스틱 12호에 재배하는 것이 분화용으로 가장 효과적이었다. 한편, 비닐 4치와 플라스틱 10호의 경우, 플라스틱 12호와 생육에 큰 차이가 없어 경제적인 것으로 판단된다. 벼룩이울타리는 원예상토에서 재배하는 것이 전반적으로 생육이 우수하였으며, 다음으로 마사토와 피트모스 혼용토 순이었다. 그러나 피트모스와 펄라이트 혼용토는 비율과 관계없이 생육이 감소하며, 잎에 황백화 현상이 나타났다. 셀당 파종량을 달리하여 육묘한 후 정식한 결과, 전반적인 생육은 1립 파종묘에서 양호하였으나, 2, 4, 6립 파종묘가 1립 처리구에 비해 포트당 엽수가 약 1.35, 1.44, 2.01배 증가하는 경향을 보였다. 그러므로 유묘 생산시 셀당 파종량을 늘려 재배하는 것이 분화용으로 효과적일 것으로 판단된다. 파종용기별 유묘의 생육은 162, 200, 288구 트레이 순이었으나, 정식 후 약 15주 동안 재배한 결과, 162, 200구에서 생산된 유묘를 정식하는 것이 288구보다 양호하였다. 따라서, 육묘 단계에서 토양 및 공간을 절약할 수 있는 200구에 파종하여 재배하는 것이 효율적인 방법으로 생각된다. 결론적으로, 벼룩이울타리의 분화용 재배는 플라스틱포트 12호에 원예상토를 충진하고 200구 트레이에 4립 또는 6립을 파종하여 육묘한 묘를 정식하는 것이 가장 효과적이다. 한편, 경제적인 측면을 고려할 때, 재배면적을 적게 차지하는 비닐포트 4치 또는 플라스틱 포트 10호에 마사토와 중화 피트모스를 혼용하여 충진한 다음 유묘를 이식하는 것도 하나의 방법으로 판단된다.

• Journal of agriculture & life science
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• v.51 no.1
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• pp.187-192
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• 2017

In various crops, seedlings are preferred to seeds for faster and more effective growth, so transplanters are used for them. This 2-row transplanter was developed to promote the mechanization of vegetable transplanting work which depends on human power. and it can automatically supply seedling tray and transport picked up seedling to the planting hopper. Also, we judged performance of transplanter with comparing seedling missing plant ration according to two types of pick-up method. Result of experiment, in finger-type picking up of 265 seedlings, missing plant ratio was 13.7% with 17 failures of pick-up and 15 collapse of bed soil. and In fork-type picking up of 200 seedlings, failure of pick-up was not appeared and missing plant ratio was low as 4% with 6 dropped during transfer. Therefore for 2-row automatic transplanter, fork-type pick-up device was found to be compatible.

• Horticultural Science & Technology
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• v.18 no.5
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• pp.591-593
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• 2000

This study was conducted to investigate the effect of training time on the growth and yield of 'Sinsakigake-2' pepper (Capsicum annuum L.). Plants were either left untrained as control or trained at the third node leaving four shoots per plant. Plants were traind at 20, 45, 70, or 95 days after transplanting (DAT). The earlier the training time, the more the branch number of the plant. Fruit weight was not affected by training time. However, the percentage of marketable fruits and the number of marketable fruits per plant were the highest in plants trained at 70 DAT, and the lowest in the control. Early marketable yield was the highest in the control, and the lowest in plants trained at 45 DAT.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.219-222
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• 2020

웹툰 시장의 성장에 따라, 웹툰을 주제로 다양한 연구가 진행되고 있다. 그러나 웹툰의 댓글을 분석한 연구는 특정 웹툰에 한정된 연구가 많아 일반적인 웹툰 독자의 댓글 특징을 보기에는 한계가 있다. 또한 웹툰의 흥행과 관련하여, 흥행에 성공한 웹툰과 그렇지 못한 웹툰의 독자 반응을 파악하는 연구는 부족한 실정이다. 따라서 본 연구는 웹툰의 흥행에 주목하여, 흥행의 지표를 웹툰 플랫폼 정식연재로 판단하고, 정식연재가 된 웹툰과 되지 못한 웹툰의 댓글을 비교 분석하였다. 분석 결과, 정식연재가 된 웹툰은 긍정적인 감상평 외에 2차적 저작물을 언급하고 등장인물의 이름 언급이 높았으나 정식연재가 되지 못한 웹툰은 부정적인 감상평 외에, 웹툰 요소에 대한 부정적 언급과 웹툰 장르와 다른 장르의 언급이 나타나 웹툰에 대한 독자의 불만족 요인을 파악할 수 있었다.

• Current Research on Agriculture and Life Sciences
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• v.15
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• pp.109-114
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• 1997

This studies were conducted to improve the root formation of plantlet derived from shoot tip culture and to evaluate the optium transplanting date of Cnidium officinale Makino in field. The rooting rate of shoot-tip derived plantlets was 81% on media containing 1.0 mg/L IBA and 0.05 mg/L BA within 30 days after culture. Upon transfer into potting soil, the seedling grown well under 75% shading. Optimal transplanting date on taking roots and rhizome growth was May 5 in field.

• Journal of Bio-Environment Control
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• v.10 no.4
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• pp.219-224
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• 2001

This experiment was conducted to evaluate net mineralization and nitrification in rain shelter soil incorporated with wine sludge. Net mineralization and nitrification rates varied among treatments during pepper growing periods. In general, net mineralization increased up to 90 days after transplanting before its decrease during the rest growing periods. Maximum net mineralization and nitrification in upper 0-15 cm layer soil were observed in T4 at 90 days after transplanting. The greatest amount of mineralization in upper layer soil was 272.5 mg.kg$^{-1}$ at 30 days in the control and 843.3 mg.kg$^{-1}$ at 90 days after transplanting in T4. Overall, both net mineralization and net nitrification were greater in the upper layer soil than in the lower 15-30 cm layer soil.

• Journal of Bio-Environment Control
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• v.19 no.1
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• pp.31-35
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• 2010

In this experiment, the effects on the growth and the quality of cut flowers of chrysanthemum 'Jinba' were mainly concerned depending on cultural methods between the pinching and the non-pinching. According to the results, the sufficient period of the vegetative growth was necessary to enter the flower bud differentiation in case of the non-pinching cultivation whereas it was not the case on the pinching. As compared with the pinching, the non-pinching showed 10% higher in the flowering ratio after flower bud differentiation. The flowering ratio of the non-pinching exceeded more than 95% but the pinching showed below 95% of the flowering ratio after flower bud differentiation. Comparing the number of cutting flowers between pinching and non-pinching, it was the non-pinching that showed the production of the first grade cutting flowers about 5 weeks faster than that of the pinching. It seem to be possible that harvesting time and growing period could be shortened. In the non-pinching growing region, above third-grading marketable cut flowers was 100% regardless of planting time. On the contrary, the pinching method showed 84.7% of marketable cutting flowers at first week from the planting, followed by 64.3% at second week, 18.8% at third week, and 2.6% at fourth week. Marketability of cutting flowers indicates that were planted by the pinching is very poor. When draw a comparison between the fourth-week planting of the non-pinching with the first-week planting of the pinching, the non-pinching could cut the growing period 38 days shorter than the pinching and the marketability was better. These results indicate that the non-pinching method can shorten the growing period and harvesting time compared to the pinching and it also resulted in reduction of cost and rapid production of the cutting flowers.