• 한국작물학회:학술대회논문집
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• 한국작물학회 1986년도 춘계 학술대회지
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• pp.38-39
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• 1986

• 한국작물학회:학술대회논문집
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• 한국작물학회 2000년도 춘계 학술대회지
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• pp.202-203
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• 2000

• Journal of Ginseng Research
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• 제5권2호
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• pp.85-91
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• 1981

Ginseng seeds were gathered from 3,4,5 and 6 years of age and were classified into four qroups (below 4mm, 4∼5mm, 5∼6mm and above 6mm in across sieve). They were sown in seedling bed and some characters were investigated in each qroup of seed size. 1. The distribution of seed size of below 4mm, 4-5mm, 5-6mm and 6mm were 23.7%, 60.8%, 12.4% and 4.5%, respectively. 2. The ratio of seed coat dehiscence was not affected by seed size but emergence ratio and emerging vigor were superior in large seed. 3. The large seed showed superiority in stem length, stem diameter, leat and also in root length, root diameter and root weight. but diseased root was not affected by seed size. The effect of age(seed harvest) was not significant on all those characters.

• Plant Resources
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• 제8권3호
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• pp.286-292
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• 2005

Shoot induction system was developed in the recalcitrant plant species, Brassica rapa ssp. rapifera by using optimum selection of profit organ, phytohormone combination, seedling age and kind of culture container. Out of in vitro cultured leaf segment, petiole, hypocotyl, and cotyledon with petiole, only cotyledon with petiole derived from 4 day-old seedlings induced multiple shoot. The optimum combination of auxin and cytokinin for the multiple shoot induction was MS medium containing 5mg/L BA and 0.5mg/L NAA. The major factors for multiple shoot propagation were part of plant organ, age of seedling, and ratio of auxin and cytokinin. In addition, shoot regeneration was promoted in the 100ml Erlenmeyer flask compared with the $90mm{\times}20mm$ Petri-dish. The induced shoots formed roots easy on MS medium containing 0.1mg/L IBA and the whole plants were successfully cultivated in soil.

• 한국작물학회지
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• 제44권2호
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• pp.122-128
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• 1999

Three rice cultivars, Namweonbyeo (early maturing), Hwaseongbyeo (medium maturing) and Dongjinbyeo (medium-late maturing) were trans-planted with 3 different seedling ages to investigate their growth habits and to improve the cultural method in paddy fields in the southern plain area of the Honam region in 1993. The 10-day old seedlings had more vigorous elongation of plant height and higher tillering ability but lower effective tiller rate, when compared with 35-day or 40-day old seedlings. Leaf area index and top dry weight were lower in 10-day old seedlings up to 40 days after transplanting but thereafter, were not different among seedlings ages. CGR was later in 10-day old seedlings, up to 30 days after transplanting, but in 30 to 40 days after transplanting, it was reversed. RGR was the highest in infant seedlings to 40 days after trans-planting, while in 50 days after transplanting, it was reversed. Panicle number and spikelet number per square meter were the highest in 40-day old seedlings, next highest in 35-day old seedlings and the lowest and in adult seedlings up to 40 days after transplanting, while spikelet number per panicle was vice versa. Milled rice yield did not vary significantly by seedling ages, but among the varieties, it was less in Hwaseongbyeo compared with Naweonbyeo and Dongjnbyeo.

• 한국초지조사료학회지
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• 제14권4호
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• pp.288-294
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• 1994

Birdsfoot trefoil(MO-20)과 tetraploid narrowleaf trefoil(PI302921)및 이들 종간 잡종의 유식물 확력을 건물축적량 광합성율 생장분석 등을 통하여 비교검토하였다. 일반적으로 종간 잡종의 표현형은 그 들 부모의 중간 특성을 나타내었으며, 암호흡, 광합성 및 휴식물생육은 이 들 모계 계통인 MO-20 birdsfoot trefoil과 유사하였다. 중간잡종은 birdsfoot trefoil 보다 빨리 자랐으나 통계적인 유의성은 없었다. 또한 교잡종은 narrowleaf trefoil보다 유식물 활력이 더 우수하였는데 그것은 낮은 암호흡율과 높은 상대성장율에 기인되었다. 앞으로 birdsfoot trefoil의 유식물 활력의 유전적인 개량은 새로운 분야로서 개량의 여지가 많음을 보여 주었다.

• Journal of Biosystems Engineering
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• 제26권5호
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• pp.415-422
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• 2001

A seedling pick-up device for vegetable transplanters was developed and its work performance was evaluated at the laboratory. The pick-up device extracts seedlings from a 200-cell tray of seedlings and transfers them to the place where they are to be transplanted into the soil. The device consists of a path generator, pick-up pins and a pin driver. The path generator is a five-bar mechanism comprised of a fixed link, a driving link, a driven link, a connecting link and a slider. The slider is constrained to move along the driven link and a fixed slot of combined straight-line and circular paths. The connecting link joins the driving link and the slider. When the slider moves along the straight-line path of the slot it takes seedlings out from the cell and transfers them to the transplanting hopper when moving along the circular path. A proto-type of the pick-up device was built and tested under the various operational conditions such as age of seedling, approach direction and penetration depth of pins to the cell, holding method of seedling and extracting velocity. The device extracted 30 seedlings per minute with the maximum success ratio of 97% using the seedlings of 23 days old. Some design details were also discussed and suggested to enhance the performance of the device.

• Journal of Biosystems Engineering
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• 제4권1호
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• pp.48-57
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• 1979

In order to obtain a standard reference for designing an adequate power rice transplanter, the cutting forces depending upon variety of seedling, sowing density, seedling age and soil moisture content of mat-type seedling were measured by the rice transplanter installed with force measuring device of dynamic strain gage system in the laboratory. The result of this study are summarized as follows : 1. Cutting velocity and acceleration transplanting hoe obtained from jinematic analysis of planting mechanism was 1.32m/sec and 81.5m/$sec^2$ when planting crank-shaft rpm was 160. 2. Little difference between cutting forces on 30-days old seelings of japonica and Indica type was observed, as the cutting forces determined were 2.0kg per hill for Japonica type and 2.1kg per hill for Indica type. 3. Cutting forces determined on 40-days old seedlings were 2.5kg, 2.3kg, 3.1kg and 2.9kg per hill for Milyang No.15, Tongil, Akibare and Milyang No.23 compared to the other varieties. 4. The cutting force was not greatly affected by the sowing densities , only five percent of differences were observed epending upon the sowing densities. 5. Cutting forces were 2.7kg and 2.0kg per hill on 40-days old seedlings and 30-days old seedlings respectively. About 38 percent of more forces was required in cutting 40-days old seedling than in cutting 30-days old seedlings. 6. More cutting forces were required as soil moisture content of mat-type seedling was decreased. 7. Root length after cutting by the planting hoe and their relationships with soil moisture content on 30-days old seedlings, are as follows ; $y=4.147-11.384x+ 28.854x^2$ where , $y$=root length after cutting. (cm) , $x$=soil ture content of mat type seedlings.(%, d.b.) 8. Cutting forces were varied with the width of cuttings ; those on 40-days old mat type seedlings were 2.7kg and 2.2kg per hill when cutting with 14 mm and 10mm of width respectively, about 32 percent of more forces was required when cuting with 14mm of width compared to 10mm of width.

• 한국잡초학회지
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• 제10권4호
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• pp.248-254
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• 1990

동일(同一) 포장(圃場)에 벼를 묘령별(苗令別)(8일묘(日苗), 20일묘(日苗), 35일묘(日苗))로 재식(栽植)한 후(後) butachlor, dithiopyr, pyrazolate 등의 각단제(各單劑) (pyrazolate는 8일묘(日苗)에만 사용(使用)) 및 dithiopyr+pyrazolate, dithiopyr+benzulfuron - methyl, butachlor+beansulfuron methyl(20일묘(日苗) 및 35일묘(日苗))에만 사용(使用)등의 제초제(除草劑)를 처리(處理)하여 초기약해(初期藥害) 및 생육(生育), 수량(收量)등을 조사(調査)한 결과(結果)는 다음과 같다. 1. 묘령별(苗令別)로 각(各) 실행구(實行區)의 생육(生育), 수량구성요소수량(收量構成要素收量), 비교조사(比較調査)한 바 유의차(有意差)가 없었다. 단(但) 출수일자(出穗日字)는 8일묘(日苗)가 20일묘(日苗) 보다 2일(日) 늦고 35일묘(日苗) 보다는 6일(日) 늦었다. 2. 각(各) 묘령구(苗令區) 모두 공시제초제(供試除草劑)에 대하여 약해(藥害)는 동일(同一)하게 경미(輕微)하였고, 그후의 초장(草長), 분얼수(分蘖數) 모두 실행구(實行區) 대비(對比)(56 DAT시(時)) 유의차(有意差)가 없었다. 3. 제초효과(除草效果)는 공시제초제(供試除草劑) 모두 우수 하였다. 4. 각(各) 수량구성요소(收量構成要素), 수량(收量) 모두 각(各) 묘령별(苗齡別)의 실행구(實行區)에 비(比)하여 유의차(有意差)가 없었다.

• 한국산림과학회지
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• 제102권4호
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• pp.537-542
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• 2013

본 연구는 백합나무 5년생의 실생묘와 체세포묘 간 생리적 요인, 기공 특성 및 DNA 함량 비교를 위해 수행되었다. 광합성율 비교의 경우 실생묘는 $10.67{\mu}mol$ $CO_2m^{-2}s^{-1}$, 체세포묘는 $9.04{\mu}mol$ $CO_2m^{-2}s^{-1}$, 기공전도율의 경우 실생묘가 0.2 mol $H_2Om^{-2}s^{-1}$, 체세포묘가 0.166 mol $H_2Om^{-2}s^{-1}$, 또한 증발산율 비교에서는 실생묘가 1.71 mmol $H_2Om^{-2}s^{-1}$, 체세포묘는 1.513 mmol $H_2Om^{-2}s^{-1}$로 각각 나타나 별 차이가 없었다. 기공밀도(실생묘, 23.33개/$mm^2$; 체세포묘, 22.43개/$mm^2$), 기공길이(실생묘, $25.83{\mu}m$; 체세포묘, $23.46{\mu}m$) 및 기공 폭(실생묘, $15.87{\mu}m$; 체세포묘, $15.3{\mu}m$)비교에서는 모든 실생묘가 체세포묘 보다 수치가 다소 높게 나타났다. Flow cytometry를 이용한 엽조직의 DNA함량 비교에서도 실생묘와 체세포묘간에는 차이가 없었다.