• Horticultural Science & Technology
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• v.16 no.3
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• pp.364-365
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• 1998

The present study was conducted to develop a more accurate and efficient measure than any other quantifying measures of the leaf variegation when influenced by changes in certain physical and environmental factors. Through this computer quantification for two Tradescantia cultivars, it was ascertained that total leaf area decreased and extent of the leaf variegation increased as light intensity increased. According to this result to determine the brightness of the leaf, using the same aforementioned measurement, the leaf color was brightest in the sun and it become darker as light intensity decreased. High correlation was found between total leaf and leaf variegation area measured by leaf area meter and the pixel of computer graphic file through scanning. Thus, the leaf area and leaf variegation area measurement using computer graphic will be used very efficiently.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2001.11a
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• pp.178-180
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• 2001

작물의 엽면적 등 다양한 생육정보를 간편하고 비파괴적으로 추정할 수 있다면 작물의 생리 생태학적 모델에의 적용을 통하여 다양한 작물 연구에 중요한 공헌을 할 수 있다. 본 연구에서는 오이 개개 잎의 형태정보를 이용하여 오이의 개개 엽면적, 생체중 및 건물중 예측하는 것을 목적으로 하였고, 이를 위하여 엽면적은 5가지 모델을 사용하였고, 생체중 및 건물중은 6가지의 모델을 사용하여 분석하였다. 또한 신경회로망은 3 layer의 back propagation method를 사용하여 분석하였다. 각 모델들은 독립변수로는 Robinson ＆ Pharr이 사용한 개개 잎의 폭 및 길이를 사용하였다. 회귀모델에 의한 추정 결과, 모델의 정확성 및 정밀성은 엽면적 > 생체중 > 건물중 순 이었지만, 특히 건물중의 경우는 상대적으로 낮은 상관관계를 가지는 것으로 나타났다. 회귀모델을 사용하여 건물중 추정하는 것에는 한계가 있는 것으로 생각되며, 신경회로망도 이와 유사한 관계를 나타냈지만 다양한 변수 수정을 통하여 상관계수를 증가시킬 수 있을 것이라고 생각된다.

• Journal of Sericultural and Entomological Science
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• v.8
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• pp.27-34
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• 1968

상수의 엽면적은 상엽의 수획량 즉 수량과 높은 상관관계가 있고 그의 간이측정법은 매우 의의 깊은 일이므로 상전에서 생체대로 엽면적을 측정할 수 있도록 간이측정법을 고안하였다. 우리나리 상수의 주요품종인 개량서반, 일지뢰, 노상 그리고 수원 제4호의 4개품종을 재료로 절위별로, 지조별로 엽면적과 엽장, 최대엽폭과의 관계를 조사 실험하였으며 공시 엽수는 개량서반 741문, 일지뢰 853문, 노상 507문, 수원제4호 441문, 도합 2,542문이었다. 5개열엽으로 엽형이 비슷한 개량서반과 일지뢰의 2개품종의 엽면적은 (엽장$\times$최대엽폭)$\times$0,643, 단엽인 노상과 수원제4호의 2개품종의 엽면적은 (엽장$\times$최대엽폭)$\times$0,735에 의해서 구할 수 있음을 알았다. 즉 개량서반과 일지뢰는 엽장에 최대엽폭을 곱한 적에 계수 0.634를 곱함으로써 전처리엽에서 planimeter에 의한 엽면적과 높은 상관관계를 보였고 이때의 상관계수의 평균을 개량서반에 있어서는 r=0.931, 일지뢰에 있어서는 r=0.960이었다. 노상과 수원상4호는 엽장에 최대엽폭을 곱한 적에 계수 0.735를 곱함으로써 전처리엽에서 planimeter에 의한 엽면적과 또한 높은 상관관계를 보였고 이때의 상관계수의 평균을 개량서반에 있어서는 r=0.931, 일지뢰에 있어서는 r=0.960이었다. 노상과 수원상 4호는 엽장에 최대엽폭을 곱한 적에 계수 0.735를 곱함으로써 전처리엽에서 planimeter에 의한 엽면적과 또한 높은 상관관계를 보였고 이 때의 상관계수 r의 평균을 노상에 있어서는 r=0.999, 수원상 4호에 있어서는 r=0.996이었다. 이 방법에 의하면 시간과 노력을 크게 절감시킬 수 있을 뿐만 아니라 생체대로 쉽게 엽면적을 구할 수 있는 이점이 있다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.1
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• pp.15-19
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• 1985

This study was carried out to develope the equations for estimating the areas of leaflet, leaf, and total leaf for 1, 2, 3, 4, 5, and 6 years old ginseng, Panax ginseng, grown in field. The highest correlation coefficient was found between leaflet area and product of leaflet length and width(LW) in all leaflets although leaflet shape varied somewhat according to the position and plant age. It was possible to estimate area of the leaf, and total leaf by one central leaflet in a compound leaf. The equations for estimating the leafet, leaf areas of 1 year differ to those of over 2 years old plant, but there was no difference among those of 2, 3, 4, 5, and 6 years. The equations for 1 year old are A =0.64 LW, A' =A/0.38, and for 2, 3, 4, 5, and 6 years old, A =0.60 LW, A' =A/0.32, A" =A' x number of leaves of central leaflet(A), leaf(A') and total leaf areas(A"), respectively. The estimation of leaflet, leaf, total leaf areas of ginseng plant grown under 20% light-transmittance rate was possible by using the equations mentioned.

• Journal of The Korean Society of Grassland and Forage Science
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• v.4 no.3
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• pp.187-193
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• 1984

Using the stratifying clip method, we examine the differences in vertical distribution of leaf area and its relationships with dry matter production were investigated in the primary swards of six varieties. The results obtained were as follows: 1. The varieties could be classified into 4 different types according to their of vertical distribution of leaf area within the canopy. Thus, M had a greater leaf area distribution in the base layers and became smaller towards the upper layers, Leto, First and Bundy had the leaf area distribution which was most abundant in the middle layers and became smaller towards the base and the upper layers, Tammisto had a greater leaf area distribution in the middle layers and intensively distributed to the upper layers, and Trader had the relatively uniform leaf area distribution over all layers. 2. Effective leaf area index(ELAI) correlated with leaf area index(LAI), dry weight of plant(DW), stem weight of plant(SW) and stem area index(SAI). 3. The variety with the heading tiller type had the effective leaf area intensively distributed to the upper layers of canopy, but the vegetative type showed a high ratio of effective leaf area index. 4. Varietal differenced was found between the effective leaf area and specific leaf weight(SLW) in each stratum above the layer indicating the highest leaf area density within the canopy. M and Trader had a highly negative significant correlation, but the other varieties was not significant correlation.

• Journal of Sericultural and Entomological Science
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• v.13 no.1
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• pp.1-11
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• 1971

This study are conducted to observe the correlation which are concerned with tile internode length to the leaf area and leaf weight. Where as, small leaf variety Gae Ryang Su Ban, and large leaf variety Ro Sang are adopted to observe their correlations in a group consisting of 30 varieties and in identifiable varieties. The results are as follows: A. Such positive correlations are observed between each characteristics and leaf area with leaf weight. (1) There are highly positive correlation between internode length and leaf area with leaf weight together within varieties group. (2) No correlation with stem length is observed, but high correlation is acknowledged in identifiable varieties although positive correlations are recognized. (3) Correlations are showed between stem volume and leaf area with leaf weight in identifiable varieties, especially Gae Ryang Su Ban higher than any other varieties. (4) Petiole length is not correlated to leaf area and leaf weight in varieties group, but petiole weight is highly correlated to leaf area and leaf weight in varieties group, Gae Ryang Su Ban and Ro Sang variety. B. Internode length along with the stem parts shows the same tendency of variance as most varieties do； internode length of I part at the base is the longest one, gradually shrunk to that of III part and gloved longer, and again internode length becomes shorter to the top. C. Variance of leaf area and leaf weight along with the parts are the lowest ones at the I part, gradually increased to the maximum at IV part, and here after it comes to shrink.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.19
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• pp.47-51
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• 1975

Leaf area and its relationships with other important agronomic traits were investigated with 727 lines of Korean local soybeans. Distributions of the leaf area, length, leaf width and LAI of the lines were shown in normal curves. Leaf area was positively associated with leaf length, and width, plant height, and seed size. Leaf form is rather affected by leaf width than leaf length.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.90-92
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• 2022

이 논문에서는 합성된 애기장대 데이터셋을 활용하여 딸기의 엽면적을 추정할 수 있는 딥러닝 모델을 제안한다. 제안된 모델에서는 개별 잎 검출을 위하여 합성 데이터셋으로 학습된 Mask R-CNN 의 객체 검출 모델을 사용하였고, 이어 이미지 후처리 작업에 해당되는 모폴로지 연산의 침식 및 팽창, 픽셀 카운터를 통해 엽면적을 추정하였다. 각기 다른 역할을 수행하는 신경망 계층에 어텐션 메커니즘 적용하여 검출 성능의 향상과 검출 시간을 단축하였다. 제안된 모델은 딸기 데이터셋을 사용하지 않는 합성된 데이터셋만으로도 실제 온실에서 획득한 다양한 이미지에서의 딸기 엽면적을 추정하는 데에 우수한 성능을 보여준다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.5
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• pp.477-482
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• 1993

The study was conducted to investigate the relationships between tobacco leaf yield and changes of leaf dry matters by tobacco growing season. In flue-cured tobacco, leaf yield was high significantly correlated with leaf dry matters from 50 days to 70 days after transplanting. In Burley tobacco, leaf yield was affected differently by the leaf dry matters according to the different growing season. High significant correlation was noted between yield and leaf dry matters at 70 days after transplanting, and having low significant correlation with leaf dry matters at 55, 60, 65 days after transplanting.

• Korean Journal of Plant Resources
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• v.8 no.3
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• pp.265-274
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• 1995

Characteristics of vegetative spur leaf, spur bud, fruiting supr leaf and flowering in relation to canopy position was investigated on order to promote better spur bud and flower bud differentiation on Citrus junos. There was no difference in vegetative spur leaf characteristics among directions. Vegetative spur leaf number and leaf area showed no difference between top and bottom position. There was no difference in spur bud size among directions, but spur bud at top was larger than that at bottom. Specific leaf weight of vegetative spur was mostly influenced by light interception, and leaf dry weight per spur average leaf dry weight, spur bud length and diameter had also a very high correlation with light interception rate. Shading and GA treatment in spur bud and flower bud differentiation was ineffective than natural light. Fruit thinning enhanced fruit quality as well as flower bud differentiation through an increase of leaf number per fruit, over 40 in Citrus junos.