• Korean Journal of Weed Science
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• v.30 no.4
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• pp.371-379
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• 2010

Crimson clover (Trifolium incarnatum), hairy vetch (Vicia villosa) and rye (Secale cereale) are common leguminous cover crops. Because they contain water-soluble allelopathic substances that show a variable level in tissue depending on growth stage of the plants, the weed inhibition effects are dependent on the growth stage of cover crops. This study investigated the allelopathic effects of crimson clover, hairy vetch and rye on soybean, radish, oilseed rape and lettuce seeds germination and seedling growth. We used extract that were prepared from the shoots of crimson clover, hairy vetch and rye at different growth stages, vegetative growth stage, flowering stage, and fruiting stage. Applications of aqueous extracts from three growth stage of cover crops strongly affected to oilseed rape and lettuce seeds germination but the treatment resulted in a slight inhibition of the germination in soybean and radish. Radical length was more sensitive to aqueous extracts than seed germination rate. Especially, three cover crops extracts at vegetative growth stage highly inhibited seedling root growth of oilseed rape and lettuce by over 80% and 90% respectively. Furthermore, the $GR_{50}$ values were lowest in the treatment of extracts from vegetative growth stage and the level of phenolics was decreased by the order of vegetative growth stage, flowering stage and fruiting stage.

• Agrochemical news magazine
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• v.14 no.3 s.114
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• pp.68-71
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• 1993

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.23-23
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• 2020

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.s01
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• pp.1-3
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• 1989

• Journal of Korea Society of Industrial Information Systems
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• v.28 no.5
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• pp.1-14
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• 2023

Soybeans are one of the world's top five staple crops and a major source of plant-based protein. Due to their susceptibility to climate change, which can significantly impact grain production, the National Agricultural Science Institute is conducting research on crop phenotypes through growth analysis of various soybean varieties. While the process of capturing growth progression photos of soybeans is automated, the verification, recording, and analysis of growth stages are currently done manually. In this paper, we designed and trained a YOLOv5s model to detect soybean leaf objects from image data of soybean plants and a Convolution Neural Network (CNN) model to judgement the unfolding status of the detected soybean leaves. We combined these two models and implemented an algorithm that distinguishes layers based on the coordinates of detected soybean leaves. As a result, we developed a program that takes time-series data of soybeans as input and performs growth analysis. The program can accurately determine the growth stages of soybeans up to the second or third compound leaves.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2023.04a
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• pp.64-64
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• 2023

콩은 중요한 식량 작물로 단백질, 기름 및 이차대사산물인 이소플라본을 다량으로 함유하고 있다. 이소플라본은 폴리페놀의 일종으로 일부 암을 예방하며 심혈관 질환을 완화하는 데에도 도움을 준다고 알려져 있다. 콩에 인위적으로 식물호르몬인 ABA를 처리할 때 이차대사산물인 kaempferol의 함량이 증가한다고 보고 되었다. 따라서 이 연구는 식물 생장조정제 처리가 콩잎의 이소플라본 함량에 미치는 영향을 알아보기 위해 수행되었다. 연구는 밀양 남부작물부 유리온실에서 수행되었으며, 콩(품종:선풍)은 와그너포트 1/2000에 1주 2본 파종하여 재배하였다. Ethephone(500, 1000, 2000 ppm)과 ABA(100, 200, 400 ppm)를 사용하였으며 각각 R2, R5, R7기에 처리하였다. 처리 후 잎을 5일 간격으로 3회 채취하여 이소플라본 6종과 쿠메스트롤의 함량을 분석하였다. 초고성능 액체 크로마토그래피(Acquity UPLC H-Class system, Waters)를 사용하여 분석하였다. 이소플라본 함량은 R5 단계에서 전반적으로 높게 나타났으며, R2 및 R7 단계에서는 무처리와 유사한 수준을 보였다. ABA를 처리하였을 때 생장조정제 간의 차이가 에테폰보다 더 큰 것으로 나타났다. 쿠메스트롤 함량은 처리시간에 따라 R7, R5, R2 순으로 높은 것으로 확인되었으며, 처리시간이 지날수록 함량이 증가함을 알 수 있었다. 생장조정제 처리에 쿠메스트롤 함량은 ABA보다 에세폰 처리 시 더 높은 경향을 보였다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1999.07a
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• pp.171-176
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• 1999

작물의 생육장해 진단은 식물체의 계측에 의해 수행되는데, 이러한 계측은 생육 중인 작물을 대상으로 할 경우, 작물의 잎이나 줄기의 비파괴적 생체(in-vivo)계측을 필요로 하며 비접촉이면 더욱 바람직하다. 그리고 식물체의 건강상태를 좀더 신속하고 정확히 파악하기 위해서는 가능한 다양한 항목을 측정 대상으로 하여 관찰하는 것이 요구될 뿐만 아니라 많은 경우 그 관찰은 미소한 생장반응 및 생장량을 측정하여야 하므로 상당히 높은 정확도의 전문 센서가 필요하다. (중략)

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1209-1211
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• 2012

최근 들어 모바일 단말기의 보급이 확대되면서 스마트 워크, NFC, USN등 사회 전반적으로 많은 분야에서 활용도가 높아지고 있다. 이에 본 논문에서는 모바일 단말기를 활용하여 농가에서 시설 원예작물의 생장 및 생산량을 예측하고 데이터를 관리하기 위한 연구를 진행하여 농가에서의 모바일 단말기 활용을 돕고 시설 원예작물의 재배에 도움이 되고자 한다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.5
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• pp.594-599
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• 1995

Generally, excessive soil water stress in vegetative growth stage inhibits the growth of soybeans. Leaf area expansion of the plant during excessive soil water stress was only half and the respiration of roots was much diminished compared with the plant none water stress. When excessive soil water stress to the soybeans was continued for 7 days, outer epidermis and vascular system of tap root were severely cracked, more than thirty-five percent of nodule was died and the bacteroid layers of alive nodule were disintegrated.

• Journal of Bio-Environment Control
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• v.18 no.4
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• pp.303-308
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• 2009

This study was conducted to analyze the feasibility of plant growth under low pressure and to investigate the effect of pressure on plant growth. Three levels of pressures (25, 50, and 101.3 kPa (control)) were provided to analyze the growth of Lettuce (Lactuca sativa L.) as affected by low pressure. Photoperiod, air temperature, and photosynthetic photon flux were set at 16/8 h, 26/$18^{\circ}C$, and $240{\mu}mol{\cdot}m^{-2}s^{-1}$, respectively. Growth characteristics of lettuce were measured on 7 days and 14 days after experiment. Leaf length, leaf width, leaf area, and root dry weight of lettuce measured on 7 days under 25 and 50 kPa were significant as compared to the control. Leaf length, top dry matter and root dry matter of lettuce measured on 14 days were significantly different under 25 and 50 kPa. From these results, we confirmed that lettuce could be grown under low pressure. However high relative humidity by evapotranspiration from leaves and growing beds under low pressure caused the condensation on the inner surface of the chamber. Therefore in a low pressure chamber, humidity control is required to maintain the relative humidity at a proper level.