• 지질공학
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• 제24권4호
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• pp.463-471
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• 2014

This paper considers the effect of rainfall on non-point source (NPS) pollutant loads. The impact of runoff on the occurrence of NPS pollutants was found to be influenced by rainfall amount, rainfall intensity, and the number of antecedent dry days (ADD), both independently and in combination. The close correlation ($R^2$ = 0.9920) between rainfall and runoff amounts was demonstrated at the study site (a flower farm) over the period between January 2011 and December 2013. The relationships among pollutant levels, runoff, and rainfall was not satisfactory results except for the Biochemical Oxygen Demand ($BOD_5$). The correlation coefficients between $BOD_5$, and both runoff and rainfall, were greater than 0.92. However, the relationships of other pollutants, such as Suspended Solid (SS), Chemical Oxygen Demand ($COD_{Mn}$), Total Nitrogen (TN), and Total Phosphorus (TP), with runoff and rainfall had correlation coefficients of less than 0.70. The roles of rainfall was different from rainfall categories on the occurrence of runoff. Instantaneous rainfall intensity was a principle factor on the occurrence of runoff following light rainfall events (total ${\leq}30mm$). For rainfall of intermediate intensity (total precipitation 31-50 mm), the combined effect of both average rainfall intensity and ADD was found to influence runoff generation. We conclude that the control of NPS pollutants with the reflection of the climate change that makes the remarkable effect of amounts and forms on the rainfall and runoff.

• 원예과학기술지
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• 제17권2호
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• pp.134-135
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• 1999

온시디움 'Aloha'에 $GA_3$를 비롯하여 cytokinin류인 BA, zeatin 및 kinetin을 농도별로 2회(6월1일과 6월 15일) 엽면 살포한 결과 화경수, 소화경수, 소화수 등이 뚜렷하게 증가되었을 뿐만 아니라 개화도 촉진되었다. 특히 BA처리는 꽃대의 수와 소화경수를 가장 많이 증가시켰으며 소화수와 크기는 50mg/L 처리구에서 현저하게 증가되었고 개화소요일수는 무처리구에 비해 100mg/L 처리구에서 26일이나 단축되었다.

• 한국연초학회지
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• 제18권2호
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• pp.126-131
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• 1996

In this study effects of isolation distance, transplanting time of maternal plants, and bagging of flower head with the gauze-cloth bag on the outcrossing of burley tobacco (Nicotiana tabacum L.) were investigated. Also the effect of fertilizer level and control of the number of capsules per plant on seed production and quality were examined. A male sterile line. produced 0.3 to 3.8 capsules Per plant when it was Planted with normally flowering tobacco with the average outcrossing of 7.2 plants, ranging from 2 to 18 out of 20 plants. With the farther the isolation distance between maternal plants and pollen donor plant, the lower the outcrossing occurred. Outcrossing occurred even at the isolation distance of 312 m. When the maternal plants were transplanted 35 days after transplanting the pollen donor ones, the outcrossed plants were not decreased significantly. The bagging of the flower head with the gauze-cloth bas (#0.9∼ 1.0 mm) decreased the outcrossed plants significantly, but couldn't prevent the outcrossing completely. The seed amount per plant was higher in the highly fertilized cultivation. The number of seed capsules per plant affected significantly on seed yield and quality. When the seed capsules was controlled by 30 or 50 capsules per plant, the weight of 1,000 seeds and germination rate were higher than those with 70 or 90 capsules per plant. Key words : Nicotiana tabacum, outcrossing, bagging.

• 농업과학연구
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• 제50권3호
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• pp.497-505
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• 2023

This study evaluated the impact of rain shelters made of plastic film on spring frost damage and fruit quality in Asian pears ('Niitaka') over two years. In 2021, during the coldest spring days (between 0:00 am and 7:00 am), temperatures dropped to -1.20 - 0.43℃ at 120 cm and -1.33 - 0.57℃ at 200 cm above ground level in the control. Conversely, the rain shelter treatment maintained higher temperatures, -0.40 - 0.87℃ at 120 cm and -0.43 - 0.77℃ at 200 cm. Flower damage was significantly lower in the rain-sheltered group, with incidences of 1.3 and 6.9% at 120 and 200 cm, respectively, compared with 18.1 and 22.6% in the control group. Visual observations verified the prevention of frost adhesion on flower organs in the sheltered group, compared with noticeable pistil death and petal browning in the control group. In 2022, when temperatures remained above 0℃, fruitlet stalk length was 5 - 6 mm longer in the sheltered group. The cumulative impact of rain shelters was evident in the improved fruit quality over the two years. This study suggests resilient cultivation strategies in the face of climate change to reduce frost damage, increase productivity, improve fruit quality, and potentially increase incomes of the farmers.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.367-367
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• 2017

Crimson clover, a legume crop, is a landscape crop and green manure crop that can be sowing in spring and autumn. Its red flower blooms in May, and serves various roles such as landscape composition, weeds suppressing, prevention of soil loss and nutrient on sloping land and supplying nitrogen and organic matter in soil. Thus, in order to utilize this crop in agriculture land, we evaluated the growth characteristics of crimson clover cultivated in four different soil textures, sand, sandy loam, loam, and clay loam. The nitrogen content of crimson clover was 15.8 g kg-1 and C/N rate was 20.3. Its growth was good in sandy loam and loam. Its plant height was 42.5 cm in sandy loam and 49.5 cm in loamy, respectively, which are approximately 20 cm longer than the sand and clay loam. The crimson clover in sandy loam and loam bloomed about seven days earlier than those in sand and clay loam. Regarding number of flower per hill and flower length, there were no difference between soil textures. Dry weight of crimson clover was 2.5 Mg ha-1, 2.3 Mg ha-1 each in sandy loam and loam. Therefore, it was approximately 0.8 ~ 1.1 Mg ha-1 higher than dry weight of sand and sandy loam. Plant height and dry weight of crimson clover was increased late harvest time. Nitrogen contribution were higher in loam and clay loam, when it was respectively 51.3 kg ha-1, 53.5 kg ha-1. Therefore, according to flowering properties and dry weight, the growth and development of crimson clover was finest in sandy loam and loam.

• 한국잠사곤충학회지
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• 제30권1호
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• pp.1-7
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• 1988

뽕나무의 화아의 기내배양을 실시할 경우 배지종류 및 생장조절물질의 농도가 각 기관의 생장 및 분화에 미치는 영향을 조사한 결과를 요약하면 다음과 같다. 1. Murashige and Skoog 배지는 Greshoff and Doy 및 Wolter and Skoog 배지에 비하여 자웅화아의 생장에 양호한 결과를 나타내었으며 자화의 성장은 2.0ppm BAP 농도에서 양호하였다. 2. 자화 및 웅화의 화아를 가지고 있는 삽수를 7일간 삽목하여 발아시킨 후 배양한 구가 삽목을 하지 않고 직접 치상한 구보다 화아의 발육이 양호하였다. 3. 고농도 Kinetin과 저농도 IAA를 혼용 첨가한 M.S. 배지에서 생장이 양호하여 발화되었고 건전한 주두 및 약을 얻을 수 있었다.

• 한국자원식물학회지
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• 제23권1호
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• pp.47-53
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• 2010

Dendranthema속의 산국, 감국 및 울릉국화의 꽃과 잎줄기(Shoot)를 80% 에탄올을 용매로 환류냉각추출하여 페놀성물질 함량, DPPH radical과 ABTS radical 소거능, ferrous ion chelating 효과 및 linoleic acid에 대한 지질 과산화 억제활성을 측정하였다. 연구의 결과, 총 폴리페놀 및 플라보노이드 물질 함량은 울릉국화에서 가장 높았으며 특히, 울릉국화 꽃에서 함량이 높았다. DPPH radical과 ABTS radical 소거능 또한 울릉국화 꽃에서 가장 우수하였으며, 울릉국화의 잎줄기에서도 소거능이 높게 나타났다. 그러나 ferrous ion chelating 효과는 산국 꽃에서 가장 높았으며, 울릉국화 꽃에서 가장 낮았다. 지질과산화 억제활성은 울릉국화 잎줄기에서 가장 높았으며, 반응 32일 이후에도 41.01%의 높은 억제활성을 보여 합성 항산화제인 BHT보다 지질산패 억제효과가 우수하였다. 연구의 결과, 울릉국화 꽃 및 잎줄기는 항산화물질함량이 높고 항산화활성이 우수하므로 천연 항산화소재로 적합하였다. 또한 동일한 식물도 부위에 따라 항산화효과가 다른 것을 확인 하였으며, 항산화효과의 종류에 따라 우수한 활성을 보이는 식물종이 각기 다르므로 사용 목적에 따라 식물종을 선택적으로 사용해야 할 것으로 생각되었다.

• 한국육종학회지
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• 제41권4호
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• pp.616-619
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• 2009

절화장미 "레드참" 품종은 전라남도농업기술원에서 육성한 적색 스탠다드 품종으로 수세가 강하고 동계생산성이 높은 적색 "First Red"를 모본으로, 적색이며 화형이 예쁜 "Cardinal" 를 부본으로 하여 2003년에 인공교배하였다. 화형과 화색이 예쁘고 수량성이 우수하며 가시가 적은 1계통을 최종 선발하였다. 2007년부터 2008년까지 3회에 거쳐 특성 및 생산력검정을 실시하여 스탠다드 대형계 품종으로 화색이 적색이며 가시가 적고 흰가루병에 강한 특성을 가지고 있으며 꽃크기가 10.3 cm, 절화장이 70.7 cm, 절화수명이 9.8일로 수명이 길며 절화수량은 3회 검정결과 115.2본/$m^2$/년으로 대비품종 "레드벨벳"(105.8본/$m^2$/년)에 비해 8.9% 증대되었다.

• Journal of Ginseng Research
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• 제33권1호
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• pp.65-71
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• 2009

This experiment was done to determine the optimum conditions for the induction of tetraploidy in Panax ginseng C. A. Meyer using bud length, temperature and plant growth regulator pretreatments. Highest callus formation was obtained when the medium was inoculated with flower bud in the size of 2-3 mm in length. The optimum temperature for the callus formation was high when treated at $4^{\circ}C$ for 4-5 days. Among the treatments of growth regulators and different concentration, highest callus formation was observed in combination of 5 mg/L 2,4-D and 1 mg/L kinetin for P. ginseng. As a result of flow cytometer analysis, all 7 adventitious roots were confirmed as tetraploidys. Cytological analysis revealed that the chromosome number of tetraploid roots was 96, while that of diploid roots was 48. Tetraploid ginseng roots were inoculated to flower bud size of 2-3 mm in length. The callus formation was optimum when treated with 1 mg/L 2,4-D at $4^{\circ}C$ for 5 days. Compared with control roots, tetraploid roots were thicker and longer and had few lateral branches. Fresh weight of tetraploid roots was relatively higher than the control roots.

• 한국작물학회지
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• 제26권3호
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• pp.269-272
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• 1981

유채의 개화습성을 용당품종을 공시하여 분석한 결과를 다음과 같이 요약할 수 있다. 1. 개체당 총개화수는 1,400～l,500개이었고 개화는 4월13일에 시작하였으며, 개체당 개화소요 일수는 30일이었다. 2. 개체당 협수는 560～630게 정도이었고 개체당 1차 분지는 18～20개이었다. 3. 협을 형성하는데 평균 5일이 소요되있고 분지의 부위에 따른 개화속도는 차이가 없었다. 4. 분지별 개화기간은 상부분지로 갈수록 0.45일씩 단축되었고 분지부위가 상위로 갈수록 협수는 1개 정도씩 감소했다. 5. 유분함량은 하부와 상부분지에서 높고 중부분지에서는 유의하게 낮았다.