• Journal of Biosystems Engineering
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• 제33권6호
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• pp.446-452
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• 2008

Machine vision system was used for analyzing leaf color disorders of tomato plants in a greenhouse. From the day when a few leave of tomato plants had started to wither, a series of images were captured by 4 times during 14 days. Among several color image spaces, Saturation frame in HSI color space was adequate to eliminate a background and Hue frame was good to detect infected disease area and tomato fruits. The processed image ($G{\sqcup}b^*$ image) by OR operation between G frame in RGB color space and $b^*$ frame in $La^*b^*$ color space was useful for image segmentation of a plant canopy area. This study calculated a ratio of the infected area to the plant canopy and manually analyzed leaf color disorders through an image segmentation for Hue frame of a tomato plant image. For automatically analyzing plant leave disease, this study selected twenty-seven color patches on the calibration bars as the corresponding to leaf color disorders. These selected color patches could represent 97% of the infected area analyzed by the manual method. Using only ten color patches among twenty-seven ones could represent over 85% of the infected area. This paper showed a proposed machine vision system may be effective for evaluating various leaf color disorders of plants growing in a greenhouse.

• 동아시아식생활학회지
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• 제15권2호
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• pp.188-193
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• 2005

As the modern medicine develops, the physique and average life span are increasing. In proportion to that, modern diseases of adult people such as cancer, obesity, arteriosclerosis, cardiac disorder become great social issues. In the meantime, as the development of a new diet brings a new attention, the study is designed to examine the availability of functional food by adding Korean traditional food, soybean Dasik, mulberry leaf. For this study, mulberry leaf was added 0, 5, 10, and $15\%$ respectively to soybean Dasik in proportion to the total weight of soybean power. These are compared with the soybean Dasik itself in relation to the nutritional composition, sensory evaluation, and mechanical characteristics. The results of the research were as follows. Nutritional composition showed that mulberry leaf soybean Dasik increased Na, Ca, K, crude fiber, and ash. As for the result of sensory evaluation of mulberry leaf soybean Dasik, the followings were turned out to be good : color - $10\%$, mulberry leaf smell - $5\%,\;10\%,\;15\%$, bitterness - $5\%,\;10\%$, softness and moistness - $0\%,\;5\%,\;10\%$, and sweetness and overall quality - all the added food group. As the test results of mechanical characteristics, mulberry leaf soybean Dasik showed statistically significant difference only in the hardness, especially high on $5\%,\;10\%,\;and\;15\%$. There were no significant differences in other characteristics. In color, mulberry leaf soybean Dasik showed that L, a and b values decreased as the percentage of addition of mulberry leaf went up. Therefore, the appropriate amount of addition for the production of mulberry leaf soybean Dasik was $5\~10\%$ mulberry leaf in proportion to the weight of soybean power.

• 농업과학연구
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• 제49권3호
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• pp.561-570
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• 2022

This study investigated the changes in planting environment and growing conditions of 'Arisoo' apple trees under shading net treatments. Apple tree canopies were fully covered with Blue (blue color net, mesh size: 4 mm × 5 mm), Black-A (black color net, mesh size: 4 mm × 5 mm), Black-B (black color net, mesh size: 5 mm × 6 mm), and uncovered trees were used as the control. Inside the tree canopies, the illuminance was observed as 100% (85.0 Klux) in the control, but it decreased to 75% (64.3 Klux) in the Blue, 73% (63.0 Klux) in the Black-A, and 77% (65.9 Klux) in the Black-B nets, respectively. The solar irradiance was observed as 755 w·m^-3 in the control, but it was decreased to 715 w·m^-3 in the Blue, 624 w·m^-3 in the Black-A, and 647 w·m^-3 in the Black-B nets, respectively. The average daily temperature was observed to be the highest in the Black-A net (31.8℃) while it was observed to be around 30.0℃ in the control, Blue, and Black-B nets. In addition, the average fruit surface temperature was observed to be the highest (39.4℃) in the control, but it was decreased to 38.1℃ in the Blue, 37.3℃ in the Black-A, and 39.0℃ in the Black-B nets. However, the average soil temperature, the shoot growth rate, and leaf SPAD values were not different in all the treatments. Fruit sunburn disorders were the highest in the control while it was observed to be lower in the fruits from trees covered with the shading nets. However, at harvest, the fruit quality parameters were not different in all the treatments. Overall, this study suggests that the apple trees covered with the shading nets reduced the illuminance, solar irradiance, fruit surface temperature, and fruit sunburn disorders. However, the shading nets did not affect tree growth and apple fruit quality.

• 현장농수산연구지
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• 제5권1호
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• pp.28-35
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• 2003

화성지역 '캠벨얼리' 포도 포도원의 엽병의 무기성분, 수체생육 및 과실품질을 조사하였다. 토양의 물리·화학성은 Y포도원은 적정기준 농도보다 pH는 높고 유기물 함량은 낮으며 인산은 2.8배, 칼륨은 3.6배 높았으나 칼슘, 마그네슘, 양이 온치환용량은 큰 차이가 없었다. H포도원은 pH와 유기물함량은 낮고 인산, 칼륨, 칼슘 및 마그네슘 함량은 적당하였다. C포도원은 유기물함량은 낮은 편이며 인산은 3.5배 높았으나, pH, 칼륨, 칼슘, 마그네슘 및 양이온치환용량은 적당한 편이었다. 그러나 심토는 배수 잘 안 되는 토양이었다. 엽병의 질소, 칼슘 및 마그네슘 함량은 적당하였으나 인산은 Y 및 C포도원에서 기준치보다 8~6배, 칼리는 Y포도원에서 1.8배 높았다. 포도원간 과실 경도, 착색정도 및 과분발생정도는 큰 차이는 없었으나, 가용성고형물, 주당수량 및 상품과율은 Y와 H포도원에 비하여 C포도원가 현저히 떨어졌다. 생리장해 및 병 발생은 Y포도원에서 동녹 발생이 H포도원은 착색불량과가 C포도원은 수정불량과, 열과 및 탄저병 발생이 많았다.

• 한국환경농학회지
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• 제42권4호
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• pp.331-337
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• 2023

본 연구에서는 황화증상이 발생한 전국 4개 지역의 배 과원에서 토양 특성과 잎의 특성을 분석하여 황화증상의 원인을 구명하고자 하였다. 황화증상이 발생한 잎의 색은 육안 또는 SPAD와 Hunter 값을 통해 진단할 수 있었다. 황화증상이 발생한 과원의 토양은 정상 과원에 비해 토양의 pH가 유의하게 높았다. 유효토심은 황화증상과 큰 관계가 없었으나, 토양에 석회 등이 과다 시비되는 조건과 결합되어 식물체의 철 흡수를 저해할 가능성이 있다. 황화증상이 발생한 잎에서는 정상엽에 비해 철과 칼슘 함량이 유의하게 낮았고, 마그네슘 함량이 유의하게 높았다. 따라서 고온다습한 6-7월경 2차 신초 발달이 일어나는 시기에 집중적으로 황화증상이 발생하는 것은 철과 칼슘의 흡수 저해와 밀접한 관계가 있는 것으로 판단된다. 이를 해결하기 위해서는 석회의 과다 시비를 피하고, 철 성분을 함유한 비료를 엽면시비하거나 수관부 토양에 관주하는 방식이 적합하다.