• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.2
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• pp.192-197
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• 1981

Alfalfa (Medicago sativa L. cv. Luna) seeded in agar was inoculated with two strains of Rhizobium meliloti isolated from root nodules of alfalfa for assessment of nodulation. The seedling growth after six weeks was remarkably increased by adding each rhizobia strains into agar media and also by nitrate application (70ug N/ml), but there was no significant difference among them. Nodulations started one week after inoculation and increased its numbers and sizes as seedling grew. Therefore, the two strains isolated from alfalfa root were concluded to be effective strains. For determining seed inoculation method the same cultivar was inoculated with both rhizobia strains using different inoculation methods such as broth-vacuum, peat-adhesive, peat & lime pelleting. They were seeded in pots of river sand and supplied with culture solution excluded nitrogen. The peat & lime pelleting was recognized the best method in both of nodulation and seedling growth after eight weeks growth. There were significant correlations between the weight of nodules and the shoot or root dry weight of alfalfa in both rhizobia strains.

• The Korean Journal of Pesticide Science
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• v.6 no.3
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• pp.202-208
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• 2002

A phytotoxin was purified by repeated chromatography from liquid cultures of Fusarium oxysporum BG isolated from barnyardgrass. Its chemical structure was determined to be dehydrofusaric acid by mass and NMR spectral analyses. The substance showed a potent phytotoxic activity against growth of duckweed with a $EC_{50}$ value of $1.5{\mu}g/ml$. It also inhibited the root growth of barnyard millet, cress, barnyard grass, and rice cultivar 'Dongjin'. However, it had no inhibitory activity against seed germination of barnyard millet and cress, and the shoot growth of the four plant species.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.84-84
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• 2022

백리향(Thymus quinquecostatus)은 꿀풀과의 낙엽반관목으로 국내에서 자생하는 허브 식물 중 하나이다. 백리향은 특유의 좋은 향기 및 항산화, 항염증, 항균, 미백 등의 효능을 가지는 각종 폴리페놀 성분을 함유하고 있어 의약품이나 기능성 식품, 화장품의 천연 소재 원료로 활용되고 있다. 국내에서 백리향은 재배 환경에 맞추어 주로 고산지대의 노지에서 재배되고 있다. 노지 재배는 지역, 시기, 기후 등의 외부환경에 영향을 받아서 백리향의 유효성분, 품질 및 생산성을 안정적으로 유지하기 어렵다는 한계를 가지고 있다. 따라서 본 연구에서는 스마트팜 시스템을 활용하여 백리향의 유효 성분 등을 안정적으로 얻기 위한 생장조건을 탐색하기 위해 4종의 Light Emitting Diode(LED) 광원과 4종의 토양 조성에 따라서 백리향의 생육조건을 수행하였다. LED는 white, purple, RGB1, RGB2를 사용하였으며, 토양은 상토:펄라이트 비율(상토, 5:1, 3:1, 1:1)로 조성하여 백리향 묘목을 이식한 뒤 생장과 개화시기를 분석하였다. 재배환경은 백리향 재배지의 기상 데이터를 참고하여 동일하게 설정하였으며, 총 8주 동안 생육상태를 관찰하였다. 연구 결과 백리향 재배 4주차에 일부 개체에서 봉오리가 올라오며 개화를 시작하였으며, 8주차에는 대부분의 조건에서 개화를 관찰할 수 있었다. 백리향의 지상부 면적을 비교한 결과 가장 우수한 생장을 보이는 조건은 토양은 3(상토):1(펄라이트) 비율로 분석되었다. 따라서 이번 연구 결과를 바탕으로 백리향 재배에 스마트팜 농업 기술을 활용한다면 기존 노지 재배 한계를 보완하여 안정적이고 지속적인 백리향을 생산할 수 있을것으로 기대된다.

• Korean Journal of Plant Resources
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• v.10 no.2
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• pp.165-168
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• 1997

To establish the culture practices for mass propagation of Epimedium koreanum, root propagules were preserved with different methods. Bud emergence rate and number of multiple buds were the highest in root segments obtained from roots with buds which were preserved in open-burial. Plant height, leaf area, and number of new buds were the highest in root segments obtained from roots preserved with stratification.

• Journal of Plant Biology
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• v.35 no.4
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• pp.359-364
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• 1992

The vascular cambium in Ginkgo biloba seedling began to differentiate in the cotyledonary node, and then the differentiation proceeded bidirectionally from the cotyledonary node toward the stem and root. In tangential view, procambium at the early developmental stage was a homogeneous structure consisted of almost similar cells in shape, and at the later stage the procambium became a heterogeneous one consisted of long cells and short cells. Such a differentiation pattern in the cotyledonary node was similar to that in the stem. However, it was different from that in the root. Fusiform initials and ray initials consisting the vascular cambium were originated from the long cells and the short cells, respectively. The long cells and the fusiform initials in the cotyledonary node were shorter and wider than those in the first internode.ernode.

• Journal of The Korean Society of Grassland and Forage Science
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• v.17 no.4
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• pp.345-350
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• 1997

Using modified Lincoln solution, hydroponic system was developed to compare simultaneously a range of pasture species in terms of relative growth rate(RGR), rate of roots to shoots, and relative root volume and root area. Modified Lincoln solution achieved optimum growth of nineteen forage species tested, and was proved to be a good method for studying plant root characteristics. RGR was measured sucesshlly showing reasonably consistant values over time. There was a much differences in rootkhoot ratio between species within groups as between groups. Root tissue density was lower in grasses than legume or herb group. Root area index was very high for grasses and herbs, and this index should be useful for evaluating the comparative root system of different species.

• Korean Journal of Plant Resources
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• v.15 no.1
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• pp.57-61
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• 2002

This study was conducted to investigate the effect of activated charcoal on growth and yield of medicinal plants in different degree of activated charcoal concentration. The results obtained are summarized as follows. Stem length was shown the longest in activated charcoal of 20%, but shorter in control. Also stem diameter was shown the thickest in activated charcoal of 20%, but thinner in control. Length and thickness of main root and thickness of main root were good in activated charcoal of 20%. Quality and yield of medicinal plants were the highest in activated charcoal of 20%. Therefore, optimum consistency of activated charcoal was 20%.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.507-507
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• 2022

작물 재배에서 정밀 관개 및 물관리를 위해 토양수분 모니터링이 필수적이며, 최근 이상기후에 따른 가뭄 빈도가 증가함에 따라 토양수분 변동에 따른 적절한 대응이 필요한 실정이다. 특히, 국산밀 생장기의 토양수분 및 관개는 생산성에 중요한 영향을 미치고 있으나, 빈번한 봄가뭄의 영향으로 작물 생산 및 품질 관리의 어려움을 겪고 있다. 따라서 국산밀의 안정적 생산을 위한 토양수분 및 양분 관리에 대한 연구가 필요하다. 본 연구에서는 ICT 기반의 토양 층위별 모니터링 시스템을 구축하여 물관리에 따른 국산밀의 안정적 생산성을 분석하고자 한다. 대상지역은 전라북도 남원시 운봉읍에 위치한 국립식량과학원 운봉시험지이며, 시험포장은 수분처리 조건에 따라 총 4개(A: 한발조건, B: 적정수분, C: 무처리) 처리구로 3개 블록을 구분하여 4반복으로 구성하였다. ICT 기반 10개 토양수분 및 EC (Electrical conductivity) 관측 장비를 통해 실시간으로 자료 수집하였으며, 밀 생육조사는 생육단계별 초장, LAI, 지상부 및 지중 생체중 등 자료를 수집하였다. 수집된 자료는 처리구별 물관리에 따른 토양수분과 생육지표의 상관관계 분석을 통해 가뭄에 따른 생육 영향과 적정 관개용수의 공급시기 및 공급량을 분석하였다. 본 연구는 밀 생장기의 봄가뭄에 대응하기 위한 물관리 기초자료로 활용하고자 하며, ICT 기반의 스마트관리 플랫폼을 개발하여 밀 작황 진단 및 예측을 통해 국산밀의 안정적 생산성에 기여하고자 한다.

• Horticultural Science & Technology
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• v.33 no.4
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• pp.518-524
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• 2015

The objective of this research was to investigate the influence of various depths of expanded rice hull (ERH) medium and fixation dates of runner plantlets of 'Seolhyang' strawberry on the growths in nursery field and in plastic house soil after transplanting. The five treatments in medium depths (30, 50, 70, 90, and 110 mm) and four treatments in fixation dates (1st and 15th July and 1st and 15th August) were tested. The growths of runner plantlets were investigated before transplanting to plastic house soil. The early growth and inflorescence rates of crops after transplant to plastic house soil were also investigated. The plant height and fresh weight of runner plantlets were the highest in the medium depths of 50, 70, and 90 mm. The medium depth of 30 mm had higher numbers of first roots, but lower root fresh weight compared to those of 70, 90, and 110 mm. The treatment of 30 mm in medium depth showed poorer growth in all indexes except root length and root weight compared to those of 70, 90, and 110 mm. The runner plantlets fixed on July 1 and July 15 showed good root growth and the weights of ERH adhered to form root balls were 18.3 g and 13.9 g, respectively. The detached amount of ERH was less than 40% in the two treatments when root balls were shaken by a vibratory sieve shaker. The plant growth at 45 days after transplanting to plastic house soil were not significantly different when the runner plantlets were fixed in the period from July 1 to Aug. 1. The inflorescence rates of the first cluster were 93 to 100% when runner plantlets were fixed in the period from July 1 to Aug. 1. By contrast the runner plantlets fixed on the Aug. 15 had a 67% in florescence rate for the first cluster. These results indicate that optimum depth of ERH medium was 7 cm and the ranges of optimum fixation dates are from July 20 to 25.

• The Korean Journal of Ecology
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• v.25 no.5
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• pp.315-320
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• 2002

Phytoremediation of soil contaminated with cadmium was studied using Indian mallow (Abutilon avicennae) in columns packed with 80 mg Cd/kg soil. At 90 days after transplat, root biomass of the exposed plants was 4 times more inhibited compared to the control. Also, shoot length of the exposed plants was 3 times more inhibited than that of control plants. Accumulation of cadmium into tissues was in the order roots> stems> leaves during the 50 days, but the order was roots> stems> seeds> leaves during the 90 days after transplant. Regardless of cadmium contaminations, microbial activities were significantly greater in soil with plants than without plants. In soil column, cadmium was not transferred toward the lower part. Uptake of Cd by plant tissues was about 3.5% of the initial bioavailable cadmium for leaves, stems, and roots during the 90 days after transplant.