• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1991-1995
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• 2006

본 연구에서는 제반 수문학적 문제 해결을 위하여 강우사상에 대해 최대평균우량깊이-유역면적-지속기간 관계곡선의 항목 중 최대평균우량깊이를 가뭄심도의 항으로 대체한 가뭄심도-영향면적-지속기간 관계 곡선의 작성방법을 제시하고자 한다. 제주도를 포함한 우리나라 전역의 기상청 월강수량을 이용하여 SPI 가뭄지수를 산정하고 EOF 기법을 적용하여 공간정보로 축약하였다. 이후 Kriging 기법으로 $6km{\times}6km$의 해상도를 가진 SPI값으로 할당함으로써 격자기반의 가뭄지수 자료의 시간 및 공간특성을 고려할 수 있다. 이에 근거하여 주요 가뭄사상을 식별 및 분석하여 영향면적별 가뭄지수를 산정하고 이에 따라 가뭄심도-가뭄면적-가뭄지속기간 관계곡선을 도시하였다. 관계곡선 작성 결과 각 지속기간에 대하여 특정한 면적 이상에서 가뭄심도가 완만하게 감소하는 형태를 보여 공간적 국지성 및 시간적 단속성이 강한 홍수와는 시 공간적으로 다르게 거동되고 있었으며 가뭄심도의 면적에 따른 감소율은 가뭄분석시의 강우깊이의 면적에 따른 감소율과 비교하였을 때 훨씬 작은 것으로 분석되었다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.2
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• pp.174-182
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• 1993

Performance of 3 indica ${\times}$ japonica(Chilseungbyeo, Samgangbyeo, and Gayabyeo), 7 japonica(Yeongsanbyeo, Yeongdeugbyeo, Hwajinbyeo, Palgongbyeo, Seumjinbyeo, Tamjinbyeo, and Milyang 95), and 2 indica(Tebonnet and Lemont) rice varieties was tested at 1, 3, 5, and 7cm seeding depths in a growth chamber and field. In the growth chamber the number of days from seeding to seedling emergence increased as seeding depth increased, while percent germination and emergence and emergence / germination ratio decreased. However, in the field seedling emergence at 1em seeding depth delayed slightly compared to 3cm probably due to lack of soil moisture. The number of seedlings and maximum tillers at 1, 3, and 5cm seeding depths was similar, but it was higher compared to 7cm seeding depth. Yield and yield components were similar among the seeding depths when all the varieties averaged although 1,000-grain weight was slightly higher at 7cm deeding depth compared to others. At 1cm seeding depth the length of mesocotyl of all varieties was similar and ranged 0.1-0.2cm and that of coleptile ranged 0.8-1.1cm. As seeding depth increased up to 7cm Tebonnet which showed the highest percent emergence emerged by elongation of both mesocotyl and coleoptile, while the other varieties emerged largely by elongation of coleoptile.

• Journal of The Korean Society of Grassland and Forage Science
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• v.31 no.2
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• pp.127-134
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• 2011

This experiment was carried out to know the adaptability and forage production and quality of corn hybrid for silage at paddy field of Chungnam region from 2008 to 2009. Among agronomic characteristics, 'Kangdaok' and 'Kwangpyongok' hybrid were somewhat strong for waterlogging and good stay green, lodging, disease and insect resistance. The dry matter yield of 'Kangdaok' and 'Kwangpyongok' hybrid were the highest among korean corn hybrids. Among introduced hybrid, 'P32T83' hybrid was strong for lodging and insect resistance, and had lower ear height and high Brix ($B^o$, %). The dry matter yield of 'P32T83' and 'P32P75' hybrid were 20,150 kg/ha and 20,500 kg/ha, respectively. The 'P32P75' hybrid was high as 73% in vitro dry matter digestibility (IVDMD) and good stay green. The result of this study indicated that 'Kangdaok', 'Kwangpyongok', 'P32T83' and 'P32P75' hybrid could be recommended as having good characters according to production, waterlogging tolerance, stay green, disease and insect resistance at paddy field in the middle region of Korea.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.3
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• pp.340-346
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• 1985

Field experiments were carried out to investigate the effects of sowing dates, ferrilizer levels and clipping treatment of forage production and quality of barley and rye in paddy field. The field emergence rates in barley varieties was decreased rapidly at sowing after November. But in rye varieties, it was not decreased even in sowing until Nov. 3. Winter survival of barley and rye varieties were not affected by fertilizer levels. And winter survival decreased with delay in sowing dates in barley varieties, but, it was not influenced by sowing dates in rye varieties. The production of forage dry matter at heading stage was increased with fertilizer levels, and was decreased with delay in sowing dates. Content of crude protein and crude fat of dry forage at heading stage were increased with fertilizer levels. But, content of crude ash, crude fiber and TDN were not influenced by fertilizer levels. As increased fertilizer levels, NFE Content was decreased and TDN yield was increased with fertilizer levels. In comparisons of TDN yield between barley and rye varieties, TDN yield of rye were superior to those of barley. Clipping twice produced more forage yield than clipping once in both crops. However, optimum clipping interval was about 40 days between first and second clipping in rye but not determined in barley. The l2cm clipping height was the highest production in average total yield.

• Journal of Bio-Environment Control
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• v.21 no.3
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• pp.228-235
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• 2012

This study was carried out to investigate the effect of irrigation methods for reducing a drainage on the growth and yield in rockwool (Grodan co.) and cocopeat (chip : dust = 50 : 50 included fiber) culture. The nutrient solution was irrigated by $100J{\cdot}cm^{-2}$-100 mL, $50J{\cdot}cm^{-2}$-45 mL, $50J{\cdot}cm^{-2}$-40 mL, $50J{\cdot}cm^{-2}$-35 mL ($100{\sim}50J{\cdot}cm^{-2}$-100~35 mL, Nutrient solution 100~35 mL was irrigated per plant when the accumulated radiation was $100{\sim}50J{\cdot}cm^{-2}$). The drain rates per plant of 100-100, 50-45, 50-40, 50-35 were 26.3%, 8.8%, 6% 4.4% and 23.1%, 7.5%, 5% 3.4% in rockwool and cocopeat slabs. The water contents and EC of 100-100 and 50-45 were managed by the 55~70%, $3.0{\sim}5.0dS{\cdot}m^{-1}$ which were good condition for paprika culture in rockwool and cocopeat slabs, while those of 50-40 and 50-35 were managed by beyond 50%, $4.5{\sim}9.5dS{\cdot}m^{-1}$. The plant height, number of branches and leaf size of 100-100 and 50-45 were similarly increased while those of 50-40 and 50-35 were decreased. The fruit size and weight of 50-40 and 50-35 were small and light, while those of 100-100 and 50-45 were similarly big and heavy. The marketable fruits of 100-100 and 50-45 treatments were similarly more by 9.7~9.8 in rockwool and 8.8~8.9 in cocopeat, while the unmarketable fruits, the small and blossom end rot fruits were increased in 50-40 and 50-35 treatments. The yield of 100-100 and 50-45 treatments were similarly high.

• Korean Journal of Plant Resources
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• v.15 no.2
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• pp.159-163
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• 2002

This study was carried out to investigate change of growth and yield of top part by different harvest date and number in Saururus chinensis. Top part of the first harvest date showed the most effective growth on July 16 and July 31, and that of the second harvest date was greater than that of the as first harvest date. Harvest dates up to July 31 increased yield of marketable leaf and stem, but the later Harvest date decreased yield as low as 41％ .Percentage of dry mater was higher as the harvest date was delayed.

• Proceedings of the Korean Society of Organic Agriculture Conference
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• 2009.12a
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• pp.296-296
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• 2009

국제기준(Codex)에 부합하는 유기농산물의 생산을 위해서는 저항성 품종의 유기종자 사용을 원칙으로 규정하고 있으나, 현재까지 우리나라의 경우는 찰옥수수 등 주요 식량작물에 대한 유기채종기술이 거의 전무한 실정이다. 본 연구는 찰옥수수 유기채종기술 확립을 위한 기초 자료로 이용하고자 찰옥수수 유기 채종에 따른 파종기별 생육 및 수량특성에 대하여 검토하였다. 유기종자 생산을 위한 채종시험은 홍천군 남면에 위치한 농가 유기포장에서 수행되었으며, 시험품종은 옥수수시험장에서 육성 보급되고 있는 미백2호 및 미흑찰 원종종자를 이용하였다. 파종기는 4월 16일, 5월 4일, 5월 27일 등 3처리로 구분하여 모 부본 동시파종 하였다. 재식밀도는 80${\times}$25cm로 하여 점파하였고 모 부본의 재식비율은 2:1로 웅주간파 하였다. 잡초방제는 흑색 P.E. Film으로 멀칭 재배하였고, 유기질비료는 H사에서 생산된 혼합유박비료를 전량 기비로 시용하였다. 파종기별 출사일수는 미백2호의 경우 4월 파종에서 79일로 가장 길었고, 파종 시기가 늦을수록 출사일수는 짧아지는 경향을 보였다. 미흑찰의 경우에는 미백2호의 결과와 같은 경향으로 파종시기가 늦을수록 출사일수가 빨라지는 경향을 보였으며, 간장 및 착수고 또한 미백2호와 미흑찰 모두 4월 파종에서 가장 높았고, 파종기가 늦을수록 낮아지는 경향이었다. 이삭특성에 있어서 이삭장과 착립장은 미백2호 및 미흑찰 모두 4월 중순 및 5월 상순 파종간에 큰 차이가 없었으나, 5월 하순 파종에서 현저하게 짧아지는 경향을 보였다. 발아율의 경우 미백2호는 4월 중순 및 5월 상순 파종에서, 미흑찰은 5월 상순 파종에서 높게 나타났다. 종실중과 100립중은 미백2호 및 미흑찰 모두 4월 중순과 5월 상순 파종간에 큰 차이가 없었고, 5월 하순 파종에서 현저하게 감소하였다. 10a당 채종수량은 미백2호의 경우 4월 상순 파종에서 217㎏으로 가장 높았고, 미흑찰은 5월 상순 파종에서 164kg/10a으로 가장 많았으며, 두 품종 모두 5월 하순 파종에서 채종수량의 뚜렷한 감소가 나타났다. 따라서 찰옥수수 유기종자의 안정적 채종과 정상수량 확보를 위해서 미백2호는 4월 중순 파종시에 그리고 미흑찰은 5월 상순 파종시에 채종 안전성이 가장 우수한 것으로 판단되었고, 또한 채종수량에 직접적으로 영향을 미치는 1개 이삭당 종실중과 100립중도 크게 증가하는 것으로 나타났다.

• Journal of The Korean Society of Grassland and Forage Science
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• v.41 no.1
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• pp.1-9
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• 2021

In the winter forage study, Italian ryegrass(IRG) and barley were selected. In 2018, the dry matter yield of IRG was 16,915kg per ha under the Agrivoltaic System; this was a little more than 16,750kg per ha of outdoors. On the contrary, the dry matter yield of barley was slightly less under the Agrivoltaic System than that of outdoors. In 2019, the dry matter yield under the Agrivoltaic System was 12,062kg per ha for IRG and 12,195kg per ha for the barley; this was 5.4% and 11.5% less than that of outdoors, respectively. In the summer forage study, corn and sorghum×sudangrass were selected. In 2019, the dry matter yield of corn under the Agrivoltaic System was 13,133kg per ha which was 17% less than that of outdoors. The dry matter yield of sorghum×sudangrass was 12,450kg per ha, which was 82.5% of that of outdoors. In 2020, the dry matter yield of corn under the Agrivoltaic System was 8,033kg per ha which was 7.9% less than that of outdoors. The dry matter yield of sorghum×sudangrass was 5,651kg per ha, which was 11.4% less than that of outdoors.

• Journal of Life Science
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• v.21 no.12
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• pp.1710-1715
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• 2011

The bactericidal effect of nano plasma ion (NPi) which was generated by NPi was analyzed using different kinds of microorganisms, exposure times, chamber sizes, ion amounts and distance. As the result of Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus and Bacillus subtilis were shown different in decrement. Gram-negative bacteria E. coli showed the highest percentage (96.57%) and Gram-positive bacteria B. subtilis which produced spore has the lowest percentage (57.41%). From the exposure time of NPi most of the microorganisms were extinct at an early stage. According to the size of the chamber we compared the loss of E.coli and the experiment result shown, analyzed NPi using 5 chambers $0.005m^3$ to $30m^3$ for 2 hr, that when volume of the chamber increased, saturation ion and bactericidal effect was decreased. In addition, an NPi generator installed in the $1m^3$ chamber investigated the decrement of E. coli. Saturation ion concentration increased with decrement. Finally, E. coli showed a similar reduction according to the distance from NPi generator.

• Journal of the Korea Concrete Institute
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• v.23 no.1
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• pp.99-107
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• 2011

This study is to performed to find the optimum mix proportion of the high strength and self compacting concrete for the above-ground LNG storage tank construction and field application. If LNG storage tank wall thicknesscan be reduced, the construction cost and quality can be improved by using self-compacting high strength concrete with compressive strength 60~80 MPa. For this purpose, low heat cement (Type IV) and class F fly ash are used in concrete mix to control hydration heat, flowability, and viscosity. Mix design variables of unit water, fly ash replacement ratio, water-binder ratio, and fine aggregate ratio are selected and tested for material properties and manufacturing cost of the concrete. Also, fly ash replacement ratio is considered using confined water ratio test. The test results showed that the optimum mix proportion of the self-compacting high strength concrete characteristics are as follows. 1) In case of the concrete with specified compressive strength of 60 MPa, the optimum mix proportion is fly ash replacement ratio of 20% and water- binder ratio of 27~30%. 2) In case of the concrete with the strength of 80 MPa, the optimum mix proportion is fly ash replacement ratio of 10% and water-binder ratio 25%. But unit water and fine aggregate ratio are 165 $kg/m^3$ and $51{\pm}2%$, respectively, regardless of the traget concrete compressive strength range. Also, test results showed that concrete manufacturing cost of 60 MPa and 80 MPa concrete require additional costs of 14~22% and 33%, respectively, compared to the manufacturing cost of 40 MPa concrete. Therefore, application of the self-compacting high strength concrete has proven to be economical in the perspective of the material cost, quality control, and site management.