• Korean Journal of Plant Resources
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• v.20 no.2
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• pp.145-149
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• 2007

Shape of soybean sprouts affects their marketability. This study was carried out to understand the effects of pressure in both overspraying and underwatering cultivation methods on growth and morphological characteristics of soybean sprouts. Pressing treatments were done by continuous pressing by laying a plastic culture box over another with growing the sprouts, their alteration every day, or no pressing in overspraying method, and by continuous pressing, pressing after the 4th day cultivation with 30 kg steel case, or no pressing in underwatering method. The soybean (cv. Junjery) seeds were soaked in 2 ppm BA solution for 5 hours and then aerated for 3 hours immediately before 6 day culture. Lateral roots, hypocotyl and root lengths, hypocotyl diameters, fresh and dry weights were measured. Lateral roots per sprout were decreased with stronger pressing regardless of watering methods. In overspraying method, continuous pressing treatment resulted in shortest hypocotyl, but no and ones did the longest root. In underwatering method, however, no pressing one showed the longest hypocotyl but continuous pressing did the shortest hypocotyl. Regardless of watering methods, middle part of hypocotyl was more thickened with stronger pressing although hook diameters of the 3 treatments were not affected. In overspraying method. total fresh weight per sprout was the least in no pressing but the greatest in continuous pressing. In underwatering method, however, there was no significant difference between the treatments.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.3
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• pp.348-353
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• 1996

Mutation tachniques inducing more useful mutations and reducing somatic effects need to be improved for crop breeding. Seeds of barley varieties ; Dema, Grosso were treated with two types of mutagens ; 1) chemical treatment: single treatment or double treatment of two mutagens (N-nitroso-N-methylurea ; MNH, Sodium Azide; NaN$_3$) 2) gamma ray irradiation treatment. After treatment, half of seeds were used for germination test and half of seeds were sown to the field. With the higher dose of mutagen both chemical and gamma ray were plants treated, the higher rate of growth reduction rate was in M$_1$ seedling. In chemical treatment, germination rate of seeds, growth rate of coleoptile and root in double treatment of chemical mutagens were better than single treatments, especially in same dose. Growth inhibition rate of plant in double treatment of 1.0mM MNH(0.5mM MNH + 0.5mM MNH), for example, were less than one of plants of single treatment of 1.0mM MNH in pot and petri dish test. Growth reduction rate of culm and fertility rate in M$_1$ plants double treated in same dose of single treatment were also less than single one. With the higher dose of mutagen both chemical and gamma ray were plants treated, the higher frequency of chlorophyll mutants was in M$_2$ seedling. The rate of chlorophyll mutants in double treatment of chemical mutagens were higher than single treatment. Double treatment methods can be a improved method for induction of new good mutants, which were induced more useful mutations and reduced harmful somatic effects.

• Horticultural Science & Technology
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• v.29 no.2
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• pp.102-109
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• 2011

This research was conducted to establish efficient methods to control root-zone temperature of tomato plant when cultivated in perlite bag during the summer season. Tomato plants were grown with four selected treatments; covering irrigation pipe by aluminum insulation material (Insulate), discarding nutrient solution inside the irrigation line before each irrigation (Discard), skipping irrigation for two hours from 13:00 to 15:00 (Skip), or no treatment as a control (Non). Based on the analysis of plant development index, all plants with selected treatments grew more vigorous and vegetative in similar growth patterns. The discard treatment exhibited the best root-zone temperature control among the treatments. The discard treatment also resulted in the best root growth and above-ground growth, followed by skip, Insulate and Non. The total yields were obtained by the order of Insulate, Discard, Non and Skip. However the marketable yield was obtained by the order of Discard, Insulate, Skip and Non. The net incomes treated with Discard and Insulate were 9,687,600 and 9,396,000 Korean won per hectare, respectively, exhibiting higher incomes than that of Non. Therefore, it was concluded that insulation of the irrigation pipe and discarding nutrient solution inside the pipe before each irrigation were the most desirable and economical methods in terms of costs and yields.

• Journal of Korean Society of Forest Science
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• v.104 no.4
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• pp.649-656
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• 2015

The objective of this study was to analyze the optimal thinning regimes for timber or carbon managements in Cryptomeria japonica stands of Hannam Experimental Forest, Korea Forest Research Institute. In solving the problem, PATH algorithm, developed by Paderes and Brodie, was used as the decision-making tool and the individual-tree/distance-free stand growth simulator for the species, developed by Kwon et al., was used to predict the stand growth associated with density control by thinning regimes and mortality. The results of this study indicate that the timber management for maximum net present value (NPV) needs less number of but higher intensity thinnings than the carbon management for maximum carbon absorption does. In case of carbon management, the amount of carbon absorption is bigger than that of timber management by about 6% but NPV is reduced by about 3.2%. On the other hand, intensive forest managements with thinning regimes promotes net income and carbon absorption by about 60% compared with those of the do-nothing option.

• Journal of fish pathology
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• v.26 no.2
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• pp.77-88
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• 2013

Starry flounder, Platichthys stellatus (body length $4.4{\pm}0.51cm$) that became sick during an outbreak of disease at mariculture facilities at Ulsan, Korea in August of 2012, were examined to identify the cause of the disease. Diseased fish didn't show a unique sign, but the oxidase-positive and gram negative rod was isolated from moribund fish. The bacterium was revealed as Photobacterium damselae subsp. piscicida by biochemical analysis and sequence analysis of the 16S rRNA and capsular polysaccharide (CPS) genes. The isolates (AD5) was carrying susceptible to ofloxacin and gentamycin and showed high growth value at $18^{\circ}C$ and $25^{\circ}C$ compared to four other P. damsela strains.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2006.05a
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• pp.173-178
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• 2006

• Journal of The Korean Society of Agricultural Engineers
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• v.52 no.6
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• pp.101-110
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• 2010

This study was performed to evaluate the void ratio and strength of porous polymer concrete used coarse aggregates and unsaturated polyester resin to find optimum mix design of porous polymer concrete for planting block. Also, this study was performed to evaluate the planting properties of herbaceous plant and cool-season grass in porous polymer blocks based on the experimental results of porous polymer concrete to develop environmentally friendly planting blocks. Tests for the void ratio and compressive strength of porous polymer concrete were performed at the curing age 7 days. Also, kinds of plants such as Tall fescue, Perennial ryegrass, Lespedeza and Alfalfa for planting were applied to porous polymer blocks. Within 6 weeks after seed, initial germination ratio, cover view and growth length for planting blocks were estimated by various methods.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.224-224
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• 2020

새롭게 개발된 미생물의 부산물인 바이오 폴리머는 토양의 강도를 높이고, 식물의 생장을 촉진시킨다. 본 연구에서는 실규모 수리 실험을 수행하여 바이오 폴리머를 이용한 호안 공법의 침식 저항 성능을 평가하였다. 실험을 위하여 다수의 호안 공법 시험체를 제작하였고, 이 시험체를 실 규모 실험수로에 설치하고 수리 실험을 통해 토양 손실과 이에 따른 한계 소류력을 결정하였다. 실험에는 일반 흙을 피복한 시험체, 바이오 폴리머와 혼합한 흙을 피복한 시험체, 식생매트와 바이오 폴리머 혼합토를 결합한 시험체 등이 사용되었다. 실험결과 재료나 식생의 활착도에 따른 차이는 있었으나 바이오 폴리머를 이용한 시험체의 침식 저항 성능이 바이오 폴리머를 이용하지 않은 시험체에 비해 높게 나타나는 것은 일관되게 확인 할 수 있었다. 이러한 결과는 바이오 폴리머를 이용한 호안공법이 기존 호안 공법의 침식 저항성능을 향상 시킬 수 있음을 보여준다. 바이오 폴리머를 제방 호안 시공에 활용한다면 홍수로 인한 제방의 유실이나 파괴를 상당 부분 예방할 수 있을 것이다.

• Journal of the Korean Wood Science and Technology
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• v.44 no.5
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• pp.767-775
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• 2016

Wood properties are affected by environmental factors such as soil, topography, rainfall, and climate change. The physical and mechanical properties of Quercus glauca were analyzed in order to investigate the relationship between wood properties and forest stand characteristics related to regions and forest origins. Physical and mechanical properties of wood were influenced by region. And no significant difference was observed between natural and artificial forests with respect to wood quality properties. Therefore, these findings are expected to be useful as fundamental data for silviculture practices of these species for wood quality.

• Journal of Sericultural and Entomological Science
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• v.30 no.2
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• pp.75-83
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• 1988

These experiments were carried out to define the rest period of mulberry by treating growth regulators in Taegu, Korea. Results obtained were as follows: It was recognized that the depth of rest in Taegu, Korea, was not deeper than that in Tokyo and Kagoshima, Japan. The rest of mulberry was begun at the end of September, subsequently became deeper through the first October into the late October and then turned gradually into quiescence by the beginning of November. Buds sprayed by gibberellic acid ($GA_3$) 10ppm and urea 0.5% were promoted to sprout, while naphthalene acetic acid (NAA) 0.02% inhibited strongly bud sprouting and abscisic acid (ABA) 20ppm had no effect on the rest of mulberry. Gibberellic acid 10ppm enhanced the rate of green color of bud after incubation for 10 days at $30^{\circ}C$. By the portion of mulberry stems, the depth of rest was different that the middle buds were less dormant than those lower. The optimal time required for the mulberry winter bud break is 15 days incubation at $30^{\circ}C$ as treated with $GA_3$.