• 한국작물학회지
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• 제37권1호
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• pp.59-67
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• 1992

벼 기계이앙을 위한 어린모 육묘에 이앙 가능한 최단기 육묘일수와 맷트형성기간을 구명하기 위하여 육묘온도와 깔판재료를 달리하여 그 효과를 조사하였던 바 다음과 같은 결과를 얻었다. 1. 육모온도가 높을수록, 또 육묘기간이 길어질수록 어린모의 맷트형성이 양호하였으며, Metalaxyl(25% 수화제, 1,000 배액) 종자침종처리는 무처리에 비하여 맷트형성 기간이 단축되었다. 2. Metalaxyl 침종처리는 무처리에 비하여 어린모의 초장신장 효과가 있었고, 경엽중과 근중도 무거웠으며, 입고병과 뜸묘의 발생을 방지하였다. 3. 어린모의 맷트형성 촉진 보조재로서 흡수지깔판(키친타올 1컵)의 효과가 인정되었으며, ＆apos;Metalaxyl 침종＋비닐＋흡수지＆apos;처리는 다른 처리에 비하여 맷트형성 기간을 1～2일 단축시켰다. 4. 어린모의 최소 육묘일수는 파종 후 5일이였다. 육묘조건은 종자를 Metalaxyl 1,000배액에 24시간 침종한 후 비닐＋흡수지 깔판에 파종하여 30/2$0^{\circ}C$(획 / 야) 온도에서 육묘한다. 5. 일반농가 비닐하우스에서 어린모 육묘시(중부지방)에는 5월의 하우스내 온도를 야간 11～16$^{\circ}C$, 획간 28～32$^{\circ}C$ 정도로 볼 때, 산파상자를 사용할 경우에는 ＆apos;Metalaxyl 침종＋비닐깔판＆apos;처리로, 또 어린모 전용 육묘상자를 사용할 경우에는 ＆apos;Metalaxyl 침종＆apos;처리로 육묘하면 파종 후 6일에 안전 이앙이 가능한 것으로 판단된다.

• 한국작물학회지
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• 제38권6호
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• pp.545-553
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• 1993

벼 기계이앙을 위한 어린모 육묘에서 뿌리엉킴촉진에 탁원한 효과가 있는 metalaxyl의 묘 뿌리분화 및 신장생장에 관한 일부 생리적 기작을 밝히고자 metalaxyl 침지처리에 따른 어린모의 근활력, 발근력, 아미노산 함량 변화, 광합성 및 엽록소함량등을 조사ㆍ분석한 결과는 다음과 같다. 1. metalaxyl(25%, 수화제) 200ppm에 침지처리한 어린모는 무처리에 비하여 전육묘기간중에 근활력이 높았으며 특히 파종후 10～13일에 현저하게 높았다. 2. metalaxyl 200ppm에 종자를 침지처리한 어린모에서 재발생된 관근의 길이는 무처리보다 유의적으로 길었으며, 뿌리의 신장을 촉진시켰다. 3. metalaxyl 200ppm에 종자를 침지처리한 어린모에서 재발생된 관근의 수는 무처리와 비슷한였으나, 관근에서 발생된 분지근(측근)의 수는 2～3배 증가되어 분기근의 분화를 촉진시켰다. 4. 어린모 뿌리의 alanine함량은 metalaxyl처리에 의하여 현저히 증가되었으며, alanine 함량과 근활력, 또 metalaxyl 농도와 분지근수 간에는 정의 상관관계가 있었다. 5. metalaxyl 침지처리는 어린모 뿌리에서 거의 모든 종류의 아니노산 함량을 증가시켰다. 6. metalaxyl처리는 어린모 체내의 엽록소 및 전질소 함량을 높이고, 광합성량을 증가시켰다.

• The Plant Pathology Journal
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• 제22권1호
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• pp.11-15
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• 2006

Five seed samples of carrot were tested to detect Alternaria spp. by blotter method. A. alternata and A. radicina were detected from all the seed samples as high as $25.8-70.5\%$ and $37.5-63.5\%$, respectively. A. dauci was detected from four seed samples as low as $0.5-7.5\%$. The three Alternaria spp. were detected from the pericarp and the seed coat and endosperm of the carrot seeds but not from the embryo by component plating test. A. alternata and A. radicina were much more detected from the pericarp than the seed coat and endosperm. A. dauci was detected from the pericarp and the seed coat and endosperm at similar rate. The seed sample which was most severely infected with A. radicina showed the lowest rate of germination in the test on top of paper (TP). In the TP test, differences in total infection rate of A. radicina and A. dauci of the seed samples were very closely correlated with those in incidence of seedling rot on the seed samples. However, there was no correlation between infection rate of A. alternata and rate of germination or seedling rot of the seed samples. Soil test for seedling growth revealed that there was no correlation between differences in total infection rate of A. radicina and A. dauci and those in rate of normal seedlings of the seed samples.

• 한국작물학회지
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• 제50권3호
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• pp.175-178
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• 2005

국제미작연구소(IRRI)의 IRGC와 INGER유전자원에 대한 직파적성을 평가하기 위하여 다양한 직파조건으로 처리된 20개 시험에서 공통으로 공시된 대비품종군(8개 품종) 직파조건에 대한 입모반응을 검토하여 품종들의 유전적 특성으로 평가하고자 시험한 결과를 요약하면; 1. 직파조건에 따른 입모율의 품종, 파종시기, 이들의 상호작용 및 모든 처리간에 통계적인 유의성이 인정되었다. 2. 직파양식, 복토깊이, 파종기 등의 직파조건별 대비품종군의 품종간 입모반응은 거의 같은 경향으로 나타나서 품종의 특성으로 분류할 수 있었다. 3. 직파조건에 따른 평균 입모율의 품종간 차이는 ASD1 > IR50 > IR72 > Taothabi > Uplri5 > CO25 > Dula > Moroberakan순으로 높게 나타났다. 4. 건답직파(파종깊이 25mm, 50mm)에서 파종시기에 따른 입모율의 품종 간 차이는 ASD1과 Moroberakan 품종 간에는 모든 직파조건에서 유의한 차이를 보였으나 다른 품종들은 직파조건에 따라서 유의성 정도가 다소 상이하여 평균 입모율의 순서와 같은 경향이었다.

• Journal of Ginseng Research
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• 제8권1호
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• pp.65-74
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• 1984

This experiment was carried out to study the effects of light intensity and soil water regimes on the growth of ginseng seedling. The results were as follows: 1. The maximum light intensity and optimum temperature in 1,le photosynthesis of ginseng seedling were 10,000 lux and 23 $^{\circ}C$. Respiration rate was increased at high temperature. 2. Air and soil temperature under the shading were increased as the increase of light intensity but soil water contents were decreased as the increase of light intensity, whereas air and soil temperature were decreased as the increase of precipitation under the shade b5: soil water contents were increased as the increase of precipitation under the shade. 3. The higher the transmittance of the shade, the greater the specific leaf weight (S.L.W.) and stomatal density. In contrast, however, the contents of total chlorophyll, chlorophyll a and b, and stomatal length was decreased. There was no any significant difference light intensity of the a/b ratio of chlorophyll. 4. The highest photosynthesis was occurred in ginseng leaves grown under the shade 5% L.T.R. and net photosynthesis rates increased with increasing soil water contents. 5. Optimum condition for usable seedling yield were 5% L.T.R. and 3.3% precipitation under the shade. Useless seedling increased with increasing precipitation under the shade.

• 한국연초학회지
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• 제19권2호
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• pp.102-106
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• 1997

The inluence of styrofoam-panel thickness of floating frame on the seedling growth of flue-cured tobacco(Nicotiana tabacum L.) in the newly developed direct-seed float system was investigated . Floating frame used instead of styrofoam-tray consisted of styrofoam-panel (106×108cm) for floating, eight holes(1.Sx2S.0 cm) to uniform the water, and nutrition supply far seedling and water and nutrition absorption cloth placed on the styrofoam-panel. Each floating-frame may lay eight plastic-trays on it. Eight grades of styrofoam-panel thickness from 26 mm to 46mm and two kinds of media were used in the greenhouse system. Dry cells were found from the styrofoam-panel thickness of 43mm in carbonized chaff, compost and original soil rate of L3-3(v/v) media, and of 37mm in peat and perlite rate of 8-2(v/v) media. The thinner styrofoam-panel produced more tender and succulent seedling with the more trunk and the less root weight. When considering the appearance of dry cell, seedling growth, producing healthy tobacco seedlings, and utilization of styrofoam-panel for two kinds of medias the ideal styrofoam-panel thickness were suggested to be around 34mm for flue-cured tobacco reeling production in the newly developed direct-seeding float system. Key words : tobacco seedlings, float system, medium, styrofoam pannel, dry cell.

• Journal of Ecology and Environment
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• 제35권2호
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• pp.73-78
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• 2012

$Calotropis$ $procera$ L. is a perennial shrub distributed in saline areas of deserts of South Asia. Salt stress is a very challenging subject in arid and semi-arid areas. Germination stage is very sensitive and many plants do not germinate in saline soil. The objective of this study was identifying the salinity effect on seed germination of $Calotropis$ $procera$ L. The experimental design was a complete randomized block design with NaCl and $CaCl_2$ at five levels of isobar concentrations: 0.0, -0.01, -0.05, -0.1, and -0.15 MPa. Osmotic potential had significant effects ($P$ < 0.01) on germination percentage, germination rate, shoot length, root length, and seedling dry weight. All seedling characteristics decreased with decrease in osmotic potential. Shoot length and root length decreased more than the seedling characteristics. Germination was completely inhibited in -0.1 Mpa. Priming with NaCl and $CaCl_2$ (-0.1 MPa) for four days had significant effects ($P$ < 0.01) on the germination percentages. Priming improved the seedling characteristics in all samples, especially in -0.05 Mpa, but a decrease with decrease in osmotic potential.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.103-103
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• 2017

Vigorous root growth at the seedling stage in dry direct-seeded conditions is considered as a critical trait because it is involved in seedling emergence, early vegetative vigour, nutrient uptake as well as drought tolerance. In this study, we performed QTL mapping using the recombinant inbred lines obtained from the cross between Tongil-type Dasan and temperate japonica TR22183 (DT-RILs) to identify QTL underlying early root development. TR22183, which was previously reported to have high nitrogen utility and cold tolerance, showed vigorous root growth at the seedling stage in semi-drought conditions. Root length, fresh weight and dry weight of TR22183 were significantly higher than in Dasan. By QTL analysis with genotyping-by-sequencing method, we identified two QTLs for root fresh weight (RFW) in chromosome 7 and root dry weight (RDW) in chromosome 8, explaining phenotypic variances of 13.5% and 10.6%, respectively. These QTLs would be used to develop rice varieties adapted to direct-seeded cultivating system.

• 한국작물학회지
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• 제24권2호
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• pp.57-63
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• 1979

본 시험은 수도 만식재배에 있어 m^2당 재식밀도나 주상묘수를 달리 하였을때 수량구성 요소 및 수량에 미치는 영향을 구명코져 실시하였든바 그 결과를 요약하면 다음과 같다. 1 . 재식밀도의 증가와 주당묘수의 증가는 단위면적당 수수와 영화수를 증가시켜 수량의 증대를 가져왔다. 2 재식밀도의 증가, 주당묘수의 증가는 단위면적당 엽신장과 엽신의 건물중을 높여 영화수를 증가시켰다. 3. 재식밀도의 증가는 단위면적당 엽면적과 건물중을 높여 수량을 증대시키는 요인이 되고 있다. 4. 밀양2001의 만식기는 m^2당 재식밀도는 28~33주, 주당묘수는 6본식으로 하는 것이 유리할 것으로 본다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.850-858
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• 1993

Germinatin and early growth of tobacco seedlings in trays containing many cells is increasing in popularity . Since 100 % germination is not likely , a major problem is to locate and replace the content of those cells which contain either no seedling or a stunted seedling with a plug containing a viable seedling. Empty cells and seedlings of poor quality take up valuable space in a greenhouse. They may also cause difficulty when transplanting seedlings into the field. Robotic technology, including the implementation of computer vision, appears to be an attractive alternative to the use of manual labor for accomplishing this task. Operating AGBOT, short for Agricultural ROBOT, involved four steps : (1) capturing the image, (2) processing the image, (3) moving the manipulator, (4) working the gripper. This research seedlings within a cell-grown environment. the configuration of the cell-grown seedling environment dictated the design of a Cartesian robot suitable for working ov r a flat plane. Experiments of AGBOT performance in transferring large seedlings produced trays which were more than 98% survived one week after transfer. In general , the system generated much better than expected.