• Korean Journal of Plant Resources
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• v.34 no.5
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• pp.470-477
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• 2021

Amsonia ellipotica (Thumb.) Roem. & Schult. has less than 10 native places nationwide and is evaluated as an endangered species (EN) on the Korean Red List, so systematic breeding and cultivation methods are required. This study was carried out to establish an effective method for seedling production in A. elliopotica that can be developed as a genetic resource conservation and new ornamental material. This experiment was performed by varying the seedling production container (72, 105 and 128 cell trays), number of seeds sown in a cell (1, 2, and 4 per cell), soil type [horticultural soil and neutralized peat-moss: perlite mixed in 3:1, 4:1 (v:v)], additional fertilizer concentrations (0, 250, 500 and 1000 mg/L) and shading degrees (0, 55 and 75%). As a result of the study, growth increased with the increased in measuring capacity per cell of sowing container. According to number of seeding growth, sowing one seed per cell was the best. Seedling growth increased as the treatment concentrations increased, higher growth was in 1000 mg/L. On the other hand, during the shading treatment, growth significantly decreased regardless of shading degrees.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.36-36
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• 2019

정향풀[Amsonia ellipotica (Thumb.) Roem. & Schult.]은 5월에 백색의 취산꽃차례로 개화하여 관상가치가 높다고 판단되나, 전국에 자생지가 10곳 미만이며 한국적색목록에 위기종(EN)으로 평가되어 체계적인 번식 및 재배법 개발이 요구된다. 본 연구는 유전자원보전 및 신 관상소재로 개발 가능한 정향풀의 효과적인 육묘법을 확립하고자 수행되었다. 실험재료는 유용식물증식센터에서 분양받은 종자를 사용하였으며, 파종용기(72, 105 및 128구 트레이), 파종립수(셀 당 1, 2 및 4립), 토양종류(원예상토 단용 및 중화 피트모스와 펄라이트를 3:1 또는 4:1로 혼용), Hyponex[미분(6.5-6-19)] 추비농도(0, 250, 500 및 $1000mg{\cdot}L^{-1}$) 및 차광정도(0, 55 및 75%)를 달리하여 2019년 4월 20일부터 8주 동안 육묘하였다. 연구의 공통사항으로 종자를 $500mg{\cdot}L^{-1}$ $GA_3$에24시간 침지한 다음 원예상토를 충진한 105구 트레이에 셀 당 1립씩 파종하였으며, 이후 2, 4주차에 $500mg{\cdot}L^{-1}$ Hyponex를 엽면시비하였다. 연구의 결과, 파종용기는 셀 당 용적량이 많을수록 초장, 경직경, 엽수, 지상부 및 지하부 생체중이 증가하는 경향이었다. 파종립수에 따른 생육은 1립 파종 시 가장 우수하였으나, 2립 파종한 묘의 개체 당 생체중이 비교적 양호함에 따라 트레이 상 풍성한 볼륨감을 나타내었다. 추비처리의 농도가 증가할수록 유묘의 생육이 증가하는 경향이었으며, $1000mg{\cdot}L^{-1}$ 처리구에서 초장, 경직경, 엽수 및 생체중이 유의적으로 높았다. 한편 차광처리 시 차광정도에 관계없이 경직경, 엽수, 마디수 및 지상부 생체중이 유의적으로 감소하였다. 따라서 정향풀은 용적량이 큰 72구 트레이에 원예상토를 충진한 다음 셀 당 2립씩 파종하여 차광하지 않은 양지에서 Hyponex $1000mg{\cdot}L^{-1}$로 추비하는 것이 관상목적으로 육묘하기 위한 효과적인 재배법으로 판단된다.

• Horticultural Science & Technology
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• v.19 no.3
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• pp.329-333
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• 2001

The study was performed to investigate the effect of a plug culture method in the early stage of a potato breeding program. The 105, 200 and 288-cell plug trays were used for raising potato seedlings. The % germination in plug trays ranged between 94 and 96%. Percent tuberization measured at 50 and 60, and 70 days after sowing was the greatest in 105-cell and 200-cell trays, respectively. However, tuberization was most delayed in 288-cell trays. Thus, it is considered that 105-cell tray is the most effective for the selection of early maturing plants. Plant maturity was determined by the morphological characteristics at the seedling stage of stolons cultured in plug trays. Most of seedlings with shorter stolons at seedling stage (1st generation) were the early-maturing, while most of seedlings with longer stolons were the late-maturing at the clonal stage (2nd generation). These results mean that the plant maturity in the early potato breeding program can be effectively grouped by observing the morphological characteristics of stolons after plug culture.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.3
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• pp.205-208
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• 2003

This study was conducted to develop a technology for raising rice hydroponically seedlings using the bed in which the seedlings grew in nutrient solution without soil. In Hydroponic rice seedlings, two nutrient solutions (Yashida and Wonsi) were evaluated with four supplying methods $[$3 times (2 days, 8 days and 12 days after seeding), 2 times (5 days and 10 days after seeding), and 1 time (5 days and 10 days after seeding)$]$1, Seedling growth was not different between the two solutions. However, tensile strength of root-mat was higher in Yoshida solution than in Wonsi solution. The more frequent supply of solution resulted in the better seedling growth but in the weaker root mat. Utilization efficiency of the solution minerals was not different in N content regardless of supplying frequencies, but higher in r, K, Ca and Mg when supplied only once on the 5 days after seeding.

• Korean Journal of Environmental Agriculture
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• v.17 no.4
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• pp.358-361
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• 1998

This study was carried out to develop a short term hardening method of tree seedlings of Rhus chinensis Mill., Evodia daniellii Hemsley and Parthenocissus tricuspidata(Sieb. et Zucc.) Planck for afforestation on a concave and a crack of cut-rock slope. The seedlings were grown in a cylinder shaped pot made of polyvinyl net with the soil media of peatmoss, vermiculite, clay, compost, fertilizer, and absorbant(40:25:19:15:1:0.1, v:v). They were cultivated in a greenhouse for four months and in field condition for two months. During the last three months of the growing period the seedlings were hardened by periodic desiccation and irrigation in 4 to 10 days interval. The hardened seedlings showed lower leaf water potential, higher leaf osmotic pressure, and lower T/R ratio than those before the hardening. The hardened seedlings survived well on the soil medium in the concave of cut-rock slope.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.3
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• pp.200-204
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• 2003

This study was conducted to develop a technology for raising seedlings hydroponically using the bed in which the seedlings grew in nutrient solution without soil. In order to establish the optimum EC value of nutrient solution, six initial EC values (1, 2, 3, 4, 5 dS/m and control) of Yoshida's hydroponic solution were examined. Seedling height and dry weight increased with increasing below EC up to 3.0 dS/m, but showed no significant increase at higher than EC 3.0 dS/m. Nutrient solution with initial EC of 3.0 dS/m was good to be dropped down nearly to 1 dS/m after 15-day seedling culture. But those with initial EC of 4.0 and 5.0 dS/m were judged not appropriate because of high EC value in waste nutrient solution. Utilization efficiency of minerals of nutrient solution and rice endosperm was higher on the whole at initial EC of 2.0-3.0 dS/m. Considering seedling growth and utilization efficiency of supplied nutrient solution, initial EC is judged to be suitable at 3.0 dS/m.

• Korean Journal of Soil Science and Fertilizer
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• v.4 no.1
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• pp.79-85
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• 1971

The rice variety, Kwanok, was reared in the water, land and salty beds and transplanted to the reclaimed soil area having an average of 0.48% salt concentration 0.67% at the end of April Two levels of $NH_3$-N and urea-N with 6 treatments were used. The effect of each treatment was observed. The plant height of the land bed seedlings at transplanting stage was short but the dry-weight/plant-height ratio was large, and the rooting ability vigorous remarkably after transplantation in the salty area. The total carbohydrate content of the stem part was markedly larger in the land bed seedlings than the others and the C/N ratio was accordingly greater. This tendency was observed through the last rooting stage. In the salty nutrient solution, the roots of salty bed seedlings showed high respiratory activity. The activity of the land bed seedlings did not decreased in the hypertonic solution as much as the water bed seedlings. There was no difference in the effect of fertilization on the rough rice yield between ammonium sulphate and urea. The cultural practices with the land and salty bed seedlings increased the rough rice yields by 33% and 22% respectively, compared with the yields of the water bed Seedlings. The number of panicles, panicle weight and the number of grains per panicle were much greater from the rice plant grown by the land bed seedlings than from the other bed seedlings.