• 한국작물학회지
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• 제60권1호
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• pp.85-90
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• 2015

바이오 디젤용 원료작물인 카멜리나를 중국 지역에서 대량 상용재배 하기 위해서 길림성 연길 지역에서 재식 밀도, 비료 시비, 파종 시기 등이 종자 생산량에 미치는 영향을 실험하였다. 재식 밀도와 증수량의 상관 관계를 알아보기 위해서 단위면적당 다른 두 가지의 파종량을 적용했다. 0.1 ha 당 카멜리나 종자 0.23 kg을 파종한 시험구가 0.56 kg을 파종한 시험구보다 60.6 g이 증대되는 결과를 보였다. 또한 비료 시비량과 증수량의 상관관계를 알아보기 위해서 0.1ha당 질소 1.97 kg과 인 12.3 kg을 시용한 시험구, 질소 2.8 kg과 인 17.5 kg을 시용한 시험구, 그리고 무시비구를 이용해서 증수량을 분석한 결과 재배지역에 따라 상이한 결과를 보였다. 다른 실험 결과와 비교하면 상당히 낮은 시비량에도 증수량이 포화되는 결과를 보이는 것으로 봐서 시험구 포장 자체가 상당한 양의 비료 성분을 포함하는 것으로 추정되며 통상적인 농경지 재배에서는 추가적인 시비 효과가 크지 않을 것으로 여겨진다. 파종 시기에 따른 종자수확량은 동일한 생육 기간을 거치더라도 5월 4일에 파종을 한 후 수확을 하는 것이 5월 29일 파종한 것보다 높은 생산량을 보였다. 이 결과는 빠른 파종 시기가 종자 생산량에 긍정적인 영향을 미친다는 것을 의미하므로 최대한 파종 시기를 앞당기는 것이 종자의 생산량을 늘리는데 도움이 될 것이라고 판단 된다.

• Journal of Biosystems Engineering
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• 제28권6호
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• pp.525-530
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• 2003

This study was carried out to develop a vacuum nozzle seeder for the automation of large seeds sowing of fruit vegetables and rootstocks. Moreover, the seeding efficiency was examined to find the optimum operating condition considering high precision seeding. The important operating factors for high seeding rate were typically nozzle diameter and absorbing vacuum pressure. The optimum nozzle diameters were found 1.5, 1.5 and 2.0 mm for Chambak, Tuktozwa and Hukjong while the optimum vacuum pressures were 8.0㎪, 10.6㎪ and 5.3㎪, respectively. Under the optimum operating condition, the results indicated that the maximum seeding rates were 97.6％, 98.8％ and 97.6％ respectively for Chambak Tuktozwa and Hukjong. The vibrating acceleration of the hopper did not make any significant effects on the seeding rate when the vacuum pressure reached 8.0㎪ and the sowing rate became higher with lighter seed. As the seed became heavier, the larger diameter of nozzle was recommended 1.5mm of the nozzle diameter was found to be applied for the experimental seeds. The vacuum pressure was also found 8.0㎪ - 13.3㎪ at that time.

• 한국초지조사료학회지
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• 제6권3호
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• pp.164-168
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• 1986

본 시험은 사초용(飼草用) 호밀의 파종기와 파종량이 사초(飼草)의 생육특성, 월동성 및 수량에 미치는 영향을 구명(究明)하기 위하여 서울대(大) 농대(農大) 사초시험포장(飼草試驗圃場)에서 수행되었다. 본 시험에서 호밀의 파종기(播種期)를 9월 8일, 9월28일, 10월18일로 하고 ha당 파종량(播種量)을 80, 130 및 180kg로 하여 9처리(處理) 3반복(反復) 난괴법으로 실시하였다. 호밀의 초장(草長)은 파종기(播種期)에 의하여 영향을 받지 않았으나 9월8일 파종구에서 가을에 수확을 하였을 때와 10월18일 파종구에서 파종량(播種量)이 증가됨에 따라 초장(草長)도 길어지는 경향을 보여주었다. 9월8일 파종구는 가을철 수확으로 인하여 월동률(越冬率)이 저하(低下)되었으나 총건물수량(總乾物收量)은 오히려 가을철 수확으로 증가(增加)되었다. 파종기에 따른 평균건물수량(平均乾物收量)은 9월8일 파종구가 ha당 5884kg, 9월28일 파종구가 4993kg, 10월18일 파종구가 3525kg였다. 호밀의 건물수량(乾物收量)은 파종기가 늦어짐에 따라 저하(低下)되었으나 파종량이 증가됨에 따라 증가(增加)되는 경향이었다. 특히 파종량에 따른 건물수량의 차이는 9월8일과 9월28일 파종구에서 보다는 10월18일 파종구에서 현저히 컸다. 본 시험결과를 종합할 때 우리나라의 중부지방에서 밭에 풋베기 호밀을 파종할 경우 조파(早播)하는 것이 수량(收量)이 많았으며 만파(晩播)할 경우 파종량(播種量)을 증가하는 것이 수량이 많았다.

• 한국초지조사료학회지
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• 제14권4호
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• pp.316-323
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• 1994

In order to reduce the problems from the presence of rye crop residues in maize establishment and yield, and also to improve the growth, productivity and nutritive value of rye(Seca1e cereal L.). an experiment was canied out to determine the variety effect of rye on the forage production system and the eft'ect of seeding and harvesting dates on the production and quality of rye. 'This experiment was conducted at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Heading date of an early maturing rye variety, Wintermore. was earlier 10 days than that of a late maturing rye variety, Kodiak. A 15-days delay in the seeding dates of early and late maturing varieties of rye tended to delay the heading dates of the rye varieties for 3 and 4 days, respectively. Dry matter and in vitro digestible dry matter yields were markedly increased with earlier seeding date. Before 20 April, the DM and IVDDM yeilds of an early maturing rye variety, Winterrnore. were higher than those of a late maturing rye variety, Kodiak. However, no such a trend was found between the early and late maturing varieties of rye after 27 April. Less than 35% of ADF was recorded until the harvesting dates of 13 and 27 p r i l for early and late maturing rye varieties, respectively, but less than 46% of NDF was maintained until the harvesting drtte of 13 April for botg varieties. Based on the results obtained from this experiment. it may be concluded that the most desirable forage production from corn-rye double cropping system is to advance the seeding time of rye toward the first 10 days of September as well as harvesting time toward the first heading stage with an early maturing rye variety.

• 한국표면공학회지
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• 제53권5호
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• pp.241-248
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• 2020

The change of the deposition behavior of diamond through a pretreatment process of the base metal prior to diamond deposition using HFCVD was investigated. To improve the specific surface area of the base material, sanding was performed using sandblasting first, and chemical etching treatment was performed to further improve the uniform specific surface area. Chemical etching was performed by immersing the base material in HCl solutions with various etching time. Thereafter, seeding was performed by immersing the sanded and etched base material in a diamond seeding solution. Diamond deposition according to all pretreatment conditions was performed under the same conditions. Methane was used as the carbon source and hydrogen was used as the reaction gas. The most optimal conditions were found by analyzing the improvement of the specific surface area and uniformity, and the optimal diamond seeding solution concentration and immersion time were also obtained for the diamond particle seeding method. As a result, the sandblasted base material was immersed in 20% HCl for 60 minutes at 100 ℃ and chemically etched, and then immersed in a diamond seeding solution of 5 g/L and seeded using ultrasonic waves for 30 minutes. It was possible to obtain optimized economical diamond film growth rates.

• Journal of Chest Surgery
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• 제26권2호
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• pp.80-85
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• 1993

Synthetic and biosynthetic vascular grafts of small diameter have long been considered to be prone to thrombosis, ultimately leading to the complete graft occlusion. Endothelial cell seeding onto synthetic blood-contacting surfaces has been suggested to be an ideal means to solve this problem. This study described a culture method of bovine endothelial cells and evaluated blood-compatibility and seeding efficiency of cultured endothelial cells. Bovine pulmonary artery endothelial cells were harvested enzymatically and grown to confluence on polystyrene culture flask surfaces using established techniques. The identification of endothelial cells was made through the demonstration of expression of factor VIII R:Ag by immunofluorescent technique. To quantitate the effect of improvement in blood-compatibility of viable endothelial cells, endothelial monolayers were exposed to blood containing $\^$111/In-oxine labeled platelets. Viable endothelial monolayers retained less labeled platelets than control surfaces. The Indium-labeled endothelial cells were seeded onto three different blood-contacting surfaces of Dacron vascular graft immobilized in specially equipped wells and incubated for specific time intervals (t=15, 30, 60, 120 minutes). Longer incubation times showed improved cell adherence in collagen-coated and fibrin-coated Dacron vascular graft groups. However in untreated Dacron grafts, no direct relationship was observed between incubation time and endothelial cell seeding efficiency. This may be due to leakage of endothelial cells through porosity of Dacron grafts in this in-vitro experimental condition.

• 한국환경과학회지
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• 제32권12호
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• pp.899-914
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• 2023

Various seeding materials for cloud seeding are being used, and sodium chloride powder is one of them, which is commonly used. This study analyzed the experimental results of multi-aircraft cloud seeding in connection with Republic of Korea Air Force (CN235) and KMA/NIMS(Korea Meteorological Administration/National Institute of Meteorological Sciences) Atmospheric Research Aircraft. Powdered sodium chloride was used in CN235 for the first time in South Korea. The analysis of the cloud particle size distributions and radar reflectivity before and after cloud seeding showed that the growth efficiency of powdery seeding material in the cloud is slightly higher than that of hygroscopic flare composition in the distribution of number concentrations by cloud aerosol particle diameter (10 ~ 1000 ㎛). Considering the radar reflectivity, precipitation, and numerical model simulation, the enhanced precipitation due to cloud seeding was calculated to be a maximum of 3.7 mm for 6 hours. The simulated seeding effect area was about 3,695 km², which corresponds to 13,634,550 tons of water. In the precipitation component analysis, as a direct verification method, the ion equivalent concentrations (Na⁺, Cl^-, Ca²⁺) of the seeding material at the Bukgangneung site were found to be about 1000 times higher than those of other non-affected areas between about 1 and 2 hours after seeding. This study suggests the possibility of continuous multi-aircraft cloud seeding experiments to accumulate and increase the amount of precipitation enhancement.

• 한국토양비료학회지
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• 제46권6호
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• pp.606-609
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• 2013

To investigate the effect of partial tillage seeding of hairy vetch on green manure biomass and rice yield, on-farm experiment was conducted at eco-friendly hairy vetch cultivation area located in Yesan-gun, Chungcheongnam-do. Seeding methods of hairy vetch consisted of partial tillage seeding (PTS) and broadcasting before rice harvesting (BBRH). Hairy vetch was incorporated into soil on May 18 and rice seedling was transplanted on May 26. The growths of hairy vetch before overwintering were investigated on November 11. Plant height of BBRH plot was longer than that of PTS plot, but somewhat larger number of seedling stand was found in PTS. Biomass and N production of hairy vetch were investigated on May 18. Results of the investigation showed no difference between two seeding methods. Although the seeding time was 21 days late in PTS, the biomass of hairy vetch and rice yield were equivalent to those of BBRH seeding, so we conclude that PTS could improve overwintering survival of hairy vetch in rice cropping system.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.258-258
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• 2017

We received 73 wheat resources from CIMMYT for analysis of agricultural characteristics and qualities of them. We sowed 73 lines and 4 Korean varieties in fall and spring to compare differences of wheat traits between fall and spring seeding. The heading and maturity date of fall seeding lines has coming faster average 18 days than spring seeding lines. Fall seeding lines have more number of spike per $m^2$ and grain number of spike. Spike and awn length of spring seeding lines were shorter than fall seeding lines and stem length was variable to varieties in both condition. Protein contents of five of 73 lines, Jokyoung and Jopoom varieties decreased but the others increased. The sedimentation values of 34 lines include Jokyoung and falling number (F/N) of 44 lines include two varieties, Keumkang and Jokyoung, decreased but the others increased, respectively. Particle size was presented that most spring seeding lines were bigger. However, when it sowed in fall, the lightness (L) of wheat flour was lighter. Consequently, we confirmed when it was sowed in spring, agricultural traits and qualities of wheat got weak.

• 한국잡초학회지
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• 제17권2호
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• pp.169-175
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• 1997

벼 직파(直播) 및 어린모 재배조건(栽培條件)에서 제초제(除草劑) 약효(藥效) 약해(藥害)에 영향(影響)을 마칠 수 있는 경작지(耕作地)의 토양(土壤) 조건(條件)에 대한 벼와 피의 반응(反應)을 실험(實驗)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 건답직파(乾畓直播) 재배조건(栽培條件)에서 토양수분함량별(土壤水分含量別) 벼와 피의 생장(生長)은 토양수분(土壤水分)이 40%일 때 가장 컸으며, 제초제(除草劑)에 대한 벼의 생육억제(生育抑制)는 토양수분(土壤水分) 50% 에서 가장 심하였다. 2. 파종심도별(播種深度別) 벼와 피의 초장(草長) 및 근장(根長)은 3cm 파종심도(播種深度)에서 가장 길었으며, 제초제(除草劑)에 대한 벼의 생육(生育)은 1cm 파종심도(播種深度)에서 억제(抑制)되었으나 피의 경우에는 전파종심도(全播種深度)에서 심하게 억제(抑制)되었다. 3. 벼의 초엽(coleoptile)장(長) 및 피의 중배축(中胚軸)(mesocotyl)장(長)은 파종(播種)깊이가 깊을수록 길었고, 제초제(除草劑) 처리시(處理時) 1cm 파종(播種)깊이에서 생육억제(生育抑制)가 가장 켰다. 4. 담수(湛水) 표면산파재배(表面散播栽培)에서 제초제처리후(除草劑處理後) 누수(漏水) 시기별(時期別) 벼의 생육억제(生育抑制)는 누수(漏水)가 지연(遲延)될수록 심하였으며, 5. 이앙심도별(移秧深度別) 제초제처리시기(除草劑處理時期)에 따른 벼의 생육(生育)은 이앙심도(移快深度)가 얕고 약제처리시기(藥劑處理時期)가 빠를수록 억제정도(抑制程度)가 컸다.