• 수산해양기술연구
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• 제59권2호
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• pp.164-171
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• 2023

This study analyzed the flow inside floating seedling equipment for Scapharca subcrenata. Due to the aging society of fishing villages, it is impossible to continuously input the labor force. Therefore, it is necessary to improve efficiency. Scapharca subcrenata has high per capita consumption. It serves as an important aquatic food resource. Scapharca subcrenata culture tends to be highly dependent on the natural environment. Production of Scapharca subcrenata is difficult to predict with low stability. In the past, manpower directly installed bamboo nets in mudflats. The seedling equipment devised in this study is a floating type and can be freely moved on the sea according to the prediction of Scapharca subcrenata generation. The flow around the floating seedling equipment was analyzed by numerical analysis. The physical phenomena of the flow around the net inside the floating seedling equipment were visualized. As a result, the space between the floating seedling equipment and the bottom net and the space between the net groups showed a lower flow rate than the inlet flow rate. It is expected that the low flow rate of the floating seedling equipment will have a positive effect on the attachment of Scapharca subcrenata.

• 한국연초학회지
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• 제19권1호
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• pp.18-23
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• 1997

The study was carried out to clarify reasonable production of healthy seedling, optimal Pot depth, and appropriate transplanting time, which can be deduced from understanding of seedling quality. Seedling quality results from growth of root and shoot, morphology and distribution of root system under influence of Pot depth during seedling growing period. Stem height, shoot dry weight, leaf area and leaf number were increased in proportion to depth of pots. Growth of shoot and root during seedling growing period showed the most dramatic development between 20th and 25th day after temporary planting. Root number increased as pot depth decrease and total root length and dry weight increased as pot depth increase. In 5cm pot, relative multiplication rate was higher and mean extension rate was lower than other depth of Pot. The limitation of pot volume in which rhizosphere was located enhance the development of roots of second and third order. At 20th days after temporary Planting root distribution was relatively uniform in length and development of adventitious root on stem base was poor as Pot depth decreased.

• 한국작물학회지
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• 제52권3호
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• pp.249-258
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• 2007

Experiments were conducted with aims to (1) estimate the biomass yield potential, (2) characterize the biomass and digestible dry matter production, and (3) reveal the characteristic seedling establishment of a whole crop rice variety, Nogyangbyeo, in dry- and wet-seeded rice. Maximum aboveground total biomass of Nogyangbyeo was 18 t $ha^{-1}$ in dry-seeded rice and 20 t $ha^{-1}$ in wet-seeded rice. Biomass yield potential of Nogyangbyeo was lower than that of Dasanbyeo. Comparatively, Nogyangbyeo was straw-dependent and Dasanbyeo was grain-dependent for biomass accumulation. Percentage of digestible dry matter (DDM) was higher in panicles than straw. Digestible dry matter yield was determined mainly by biomass yield rather than DDM percentage. Number of seedling establishment in Nogyangbyeo was $73m^{-2}$ in dry-seeded rice and $109m^{-2}$ in wet-seeded rice. Poor seedling establishment of dry-seeded Nogyangbyeo in the field condition was the result of low seed germination under low temperature and poor seedling emergence by deep sowing. Low seedling emergence rate of Nogyangbyeo was attributed mainly to slow elongation growth by slow leaf development and partly to mesocotyl and 1st internode lengths, not to genetically defined leaf length. The slow elongation growth of Nogyangbyeo was the same even in the high daily mean temperature of $24^{\circ}C$. Results suggest DDM yield in rice can be improved simply by increasing biomass and whole crop rice varieties should be adaptable to direct-seeding.

• 한국작물학회지
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• 제43권2호
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• pp.95-100
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• 1998

Seedling establishment of soybean [Glycine mar (L.) Mer-rill] is an important factor for soybean production in the field. The objective of this study was to determine the distribution of chemical composition in the emerging organs during seedling development in soybeans. Three soybean cultivars (Hill, Paldalkong, and Jangyeobkong) were planted at the Research Farm of College of Natural Resources, Korea University, on May 26, June 5, and June 14. Protein, oil, sugar, and starch contents were measured in each organ at each developing stage. Mean dry weight of three soybean cultivars decreased until VE stage and increased after this stage. Protein content of whole seedling did not change significantly during the seedling growth stage, but the amount in cotyledons markedly decreased with each growth stage increment. About 88% of the cotyledon protein was translocated to the other parts of the seedling at the V2 stage. Oil content of cotyledons sharply decreased until the V1 stage. Sugar content of the seedling was not detected at VE stage and starch content of seedlings increased slightly at VE and VC stages. For the changes of each metabolic component, the amount for whole plants decreased until the V1 stage and started to increase after this stage. The results of this study provide evidence for the breakdown of carbohydrates and oil at the initial stage of seedling growth.

• 한국작물학회지
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• 제48권2호
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• pp.89-95
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• 2003

The study of this experiment is focused on labor saving of healthy rice seedling production using PSF (polypropylene spunbonded fabrics) as thermal protection material. Several factors such as different compositions of nursery soil and PSF materials were tested to produce healthy rice seedlings. The inner thermal protection material in PE film (polyethylene film) showed $0.9-1.7^{\circ}C$ higher than that of PSF 40-100 $\textrm{gm}^{-2}$. The light transmittance-ratio also showed similar trends. It is considered that the appropriate PSF material density was 40 gm$\textrm{gm}^{-2}$ in accordance with economic values and healthy rice seedlings. Plant height and dry weight according to various nursery soil showed the rang-es of 8.5-14.2cm and 5.5-10.0mg, respectively. In composition of nursery soil, artificial soil combined with paddy soil was effective in producing healthy seedling for rice seedling production. The total sugar content also showed the difference between PSF 40, 60 $\textrm{gm}^{-2}$ PE film (0.43-0.52mg FW $\textrm{g}^{-1}$) and PSF 80, 100 $\textrm{gm}^{-2}$ (0.28-0.35mg FW $\textrm{g}^{-1}$) and it showed the same tendency among varieties as well as various nursery soil. These results demonstrate that PSF 40 $\textrm{gm}^{-2}$ economically affordable, and can be recommended as thermal protection material for producing good healthy rice seedling.

• 한국자원식물학회지
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• 제17권3호
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• pp.219-226
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• 2004

양파의 생력재배를 위한 플러그 육묘시 성묘율 향상에 필요한 정보를 제공하고자 농우대고와 창녕 대고를 공시 품종으로 종자의 선종, priming, GA$_3$, 저온, 건조, 건조 중 광질의 개 별 처리가 발아율에 미치는 영향과 최적 개별처리를 조합한 종자처리가 유묘출현율에 미치는 영향을 추적하고자 본 연구를 실시하였던 결과 양파 종자에 처리를 가하기 전 선종이 발아율을 향상시키는 것으로 조사되었으며, 양파 종자의 발아율에 대한 priming과 GA$_3$처리 효과는 아주 미미하였던 반면, 저온처리 효과는 아주 큰 것으로 나타났다. 이러한 저온처리는 품종간 약간의 차이를 보일지라도 3일간 처리할 경우 발아율이 가장 양호하였다. 처리 종자의 건조방법으로는 건조하지 않는 것보다는 건조하는 것이, 건조할 경우 적색광을 조사하는 것이 발아율이 높았다. 유묘출현율은 선종된 종자를 저온처리를 가하지 않고 건조하는 것보다는 3-5일간 저온처리를 가한 후 적색광을 조사하면서 건조할 경우 높은 것으로 조사되었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.102-102
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• 2022

More than 74% of forage crops in Korea are cultivated in winter rice fields. Italian ryegrass (IRG) can be said to be a representative forage crop, but over 70% of its seeds are dependent on imports. In addition, there are concerns that the stable supply of research fees may be disrupted due to the effects of climate change, war, and other factors. Therefore, it is necessary to secure a large production area for stable supply. Korea's reclaimed land area is 135,000 ha and its agricultural area is 112,000 ha. Therefore, this study attempted to apply IRG to the domestic IRG seed industry through stable cultivation techniques on reclaimed land. In this study, IRG 'Kowiearly' varsity was cultivated in late October 2020 and early October 2021 in the Saemangeum reclaimed land. The seeding methods were conventional drill sowing seeding, new technology spot seedling (30 × 18 cm) and new technology drill sowing seeding. The amount of sowing was conventional drill sowing seeding 2.0(kg/10a), new technology spot seedling 1.5(kg/10a), and new technology drill sowing seeding 1.5(kg/10a). Fertilizer application amount is conventional drill sowing seeding(N-P₂O₅-K₂O) 9.0-12-12(kg/10a), and new technology spot seedling and drill sowing seeding were(N-P₂O₅-K₂O) 4.5-12-12(kg/10a) respectively. Fertilizer was applied accordingly. After that, in February, the conventional drill sowing seeding, new technology drill sowing seeding and spot seedling applied 4.0 and 2.2(kg/10a) of nitrogen supplement fertilizer, respectively. Before wintering, plant length was higher in 2022 than in 2021, but leaf number was higher in 2021. Heading time was April 30, 2021 and April 25, 2022. In heading time, plant length was 74 cm in 2021 and 67 cm in 2022, lower than in 2021. On the other hand, There was no difference in the number of panicle and the number of seeds in the 2021 harvester in all treatment plots, and, thus seed yield was no differ. However, the drill sowing seeding and spot seedling of the new technology were somewhat higher than the conventional drill sowing seeding. On the other hand, seed yield was decreased in all treatment plots compared to 2022 because of raifall deficiency in 2021.

• Journal of Ginseng Research
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• 제9권2호
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• pp.146-153
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• 1985

This study was conducted to know the effect of vinyl mulching from the sowing to germination on the seedbed for germination and production of seedling. Embryo growth was restrained with decreasing the water content in seed and stopped below 10% water content. Germination was possible over 55% water content but radicle growth was stopped at 55% water content. Ratioes of embryo / emdosperm length were about 50% at seeding time, and about 80% at just before freeing season, and the ratio was increased from the thawing season again. Vinyl mulching increased the soil water content and soil temperature. Germination rate and number of available seedling in vinyl mulching were increased 10% and 12%, respectively.

• 한국산림과학회지
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• 제112권2호
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• pp.136-144
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• 2023

본 연구는 헛개나무(Hovenia dulcis Thunb.) 묘목 생산을 위한 적정 시비수준을 밝히고자 수행되었다. 헛개나무 1년생 용기묘를 대상으로 6가지 시비수준(대조구, 0.5, 1.0, 1.5, 2.0, 2.5 g·L^-1)에 따른 용기묘의 간장, 근원경, 물질생산량, 묘목품질지수, 엽록소 함량 등을 조사하였다. 연구 결과, 헛개나무 용기묘는 시비수준이 높아짐에 따라 간장 및 근원경 생장과 건중량이 증가하였으나, 1.5 g·L^-1 이상의 처리구에서는 큰 차이가 없었으며, 간장 생장의 경우 2.5 g·L^-1 시비처리구에서 유의적으로 낮은 값을 나타냈다. 묘목품질지수는 1.5 g·L^-1 이상 처리시, 처리구간 유의적 차이가 없는 높은 값을 보였으며, 엽록소 함량은 1.5 g·L^-1 처리구에서 가장 높은 값을 나타냈다. 시비처리에 따른 환경적, 비용적 측면을 고려 하였을 때, 우량 헛개나무 용기묘 생산을 위하여 요구되는 적절한 시비수준은 1.5 g·L^-1이며, 최소한의 묘목규격을 충족시키기 위해서는 적어도 0.5 g·L^-1의 시비처리가 필요할 것으로 판단된다. 본 연구의 결과는 약용 및 밀원자원으로 이용되는 헛개나무의 효율적인 묘목 생산체계 구축 및 안정적인 묘목 공급을 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• 한국작물학회지
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• 제46권2호
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• pp.125-129
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• 2001

Eight vermiculite-based root media prepared with addition of complete fertilizer (2 g/L; N-$P_2$$O_5$-$K_2$O, 10-10-14) for potatoes (Solanum tuberosum L.) and a commercial root medium were evaluated in 2000 to develop the root media suitable for potato plug seedling production. The eight media consisted of various ratios of vermiculite, perlite, peatmoss, and compost. In addition, four rates (0, 1, 2, or 4 g/L) of the complex fertilizer for potato were added to a root medium (70% vermiculite, 10% perlite, 10% peat moss, and 10% compost by volume) to determine the optimum addition rate of the complex fertilizer for plug seedlings. Compost addition to the media increased plant height, the number of leaves per plant, and top and root fresh weight of 15-day old plug seedlings. The seedlings raised in root media containing compost produced significantly higher total tuber yield. Addition of the complex fertilizer to root media enhanced seedling growth and increased the number of tubers per plant and tuber yields. The results suggest that root media containing 50% vermiculite, 0 to 20% peat moss, 10% perlite, 20 to 40% compost, and 2 g/L complex fertilizer for potato appear suitable for potato plug seedling production.