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Effect of Monochromatic UV-A LED Irradiation on the Growth of Tomato Seedlings
Bekhzod Khoshimkhujaev,권준국,박경섭,최효길,이선이 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.4
Effect of 376 nm UV-A LED irradiation on the growth and morphology of tomato seedlings was studied. Tomato seedlings were grown under the 658 nm red LEDs or the red LED supplemented with two irradiation levelsof the UV-A. The growth and development of tomato seedlings were significantly enhanced under the red lightsupplemented with the UV-A. Under the UV-A treatments, the tomato seedlings became more compact, the growthof plant organs was balanced, the leaf area was increased, and the total plant fresh and dry weights were alsoenhanced. Our findings suggested that the 376 nm UV-A from LEDs had a beneficial effect on the growth anddevelopment of tomato seedlings as similarly to the blue light.
Bekhzod Khoshimkhujaev,Joon Kook Kwon,Jae Han Lee,Hyo Gil Choi,Kyoung Sub Park,Nam Jun Kang 경상대학교 농업생명과학연구원 2016 농업생명과학연구 Vol.50 No.5
Plant growth and development strongly influenced by light quantity and its spectral composition. Young tomato plants were cultivated in growth cabinets under artificial light provided by red and blue light emitting diodes(LEDs) during 12 hours, then plants were exposed to monochromatic ultraviolet, blue, green and red lights as an end-of-day(EOD) treatment during 4 hours to study their effect on plant growth parameters. EOD lighting from various LEDs increased total fresh and dry weights as well as assimilation area compared to those in control. Blue light increased stem height, internode length and stem diameter. Monochromatic UV-A light reduced stem elongation, highly increased stomatal conductance. Compactness and health index of young tomato plants were increased in UV-A and red light treatments.
LED 전조재배가 딸기의 과실품질과 생산량에 미치는 영향
최효길,정호정,문병용,Khoshimkhujaev Bekhzod,권준국,박경섭,이선이,조명환,강남준 경상대학교 농업생명과학연구원 2013 농업생명과학연구 Vol.47 No.1
LED 보광 재배에 따른 딸기‘대왕’과‘설향’품종의 과실품질과 생산량을 확인하기 위하여 11 월 10일부터 3월 20일까지의 생육기간 동안 각각의 LED 광인 청색, 적색 그리고 혼합(청색:적색 = 3:7) 광을 17시부터 23시까지 75±5 μmol·m-2·s-1의 광량으로 조절하여 전조하였다. 겨울철 딸기 전조 재배에 주로 이용되고 있는 백열등을 대조구로 사용하였다. 딸기 두 품종에 있어, 생산 량은 청색 LED 광에서 증가하였고, 과실 경도와 당 함량은 3종류의 LED 광 모두에서 향상되었 다. 반면에 산도는 적색 LED 광에서 가장 높았다. 과실의 안토시아닌 함량에 있어서‘대왕’은 청색과 혼합 LED 광에서 유의적으로 증가한 반면, ‘설향’은 혼합 LED에서 증가하였다. 적색 LED는 유기산에 있어‘대왕’과‘설향’과실에 각각 말산과 옥살산의 함량을 증가시켰다. ‘대 왕’ 과실의 페놀화합물 함량은 적색 LED와 대조구인 백열등이 다른 LED 광 처리보다 유의적으 로 높았으나, ‘설향’ 과실은 대조구인 백열등에서 가장 높게 나타났다. 효과적인 생산량과 과실 품질을 고려해 볼 때, 겨울철 딸기 재배에 있어 보조광원으로 청색 LED 광이 유리할 것이다. The effects of supplemental LED lightings on fruit quality and yield of two strawberry (Fragaria × ananassa) cultivars ‘Daewang’ and 'Seolhyang' were determined when blue (441 nm), red (659 nm) and mixed (blue:red = 3:7) LED lights were each supplied daily from 17:00 to 23:00 h, throughout growth period (from Nov. 10 to Mar. 20), with light intensity being adjusted to 75 μmol·m-2·s-1. Incandescent bulbs, which are usually supplemented for winter strawberry cultivation, was used as a control. In both cultivars, blue LED increased yield, and all three types of LEDs enhanced fruit hardness and SSC, while acidity was highest in red LED. Anthocyanin contents in fruit were significantly increased by both blue and mixed LED lightings in 'Daewang', while in 'Seolhyang' only by the blue LED, compared to the incandescent bulb control. Blue and mixed LED lights enhanced glucose contents in‘Daewang’ fruit, while did the mixed LED light in 'Seolhyang’ fruit. As for fruit organic acids, red LED significantly increased malic and oxalic acid contents in 'Daewang' and 'Seolhyang', respectively. In 'Daewang', fruit phenolic compounds contents were significantly higher in red LED or incandescent bulb control than other LED treatments, while in‘Seolhyang’seemed to be highest in the incandescent bulb control. Considering its positive effect on yield and fruit quality, blue LED could be a potential supplemental lighting source for strawberry cultivation winter season.
Status and Perspectives of Vegetable Production in Uzbekistan
Joon-Kook Kwon,Bekhzod Khoshimkhujaev,Yun-Im Kang,Sang-Duk Lee,Yang-Hee Cho 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.4
최근 인구 증가 및 기후 변화로 인해 채소를 비롯한 농작물에 대한 수요가 증가되고 있는 가운데 우즈베키스탄에서는 채소 및 식량자원의 자급 달성을 위한 대규모 사업을 추진하여 왔다. 그 결과독립 후 현재까지 약 20년간 채소 생산량은 약 140%, 감자는 168%각각 증가하였고, 특히 최근 5년간에 채소 생산량은 1.7배나 증가하였다. 채소 생산량의 증가에도 불구하고 우즈벡은 여전히 수요량을 충족하지 못하고 있는 실정이다. 이는 인구 증가와 더불어 정부의 목화와 곡물 생산 집중, 관개면적의 확대 제한 등에 기인하고있다. 우즈벡의 채소산업의 미래는 생산 장려와 수출가능성 때문에 밝다고 할 수 있다. 특히 채소 공급업자들은 러시아, 카자흐스탄과 같은 주요 수출시장에 기반을 구축해 있고 그 외 중앙아시아와 중국 시장도 우즈벡 채소산업의 성장 가능성을 말해 주고 있다. As a result of changing climate and growing population in recent years, it was observed an increasing demand for agricultural crops as well as for vegetables. In Uzbekistan large-scale activities were carried out to increase production for fully providing population with foodstuff products. After gaining independence (1st September, 1991) the area for vegetable crops increased by 140%, potatoes by 168%. In the last 5 years the amount of vegetable production increased by 1.7 times. Regardless of the increase in overall vegetable production Uzbekistan still does not meet the demand of certain vegetables. This could be due to rapid growth of population, concentration on cotton and grain production, and limited expansion of irrigated land. Uzbekistan vegetable suppliers already have a foothold in major export markets such as Russia and Kazakhstan. Taking the above into planning and action, the future of the vegetable industry of the Uzbekistan would be positive.
Development of a Coupled Photosynthetic Model of Sweet Basil Hydroponically Grown in Plant Factories
박경섭,Khoshimkhujaev Bekhzod,권준국,손정익 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.1
For the production of plants in controlled environments such as greenhouses and plant factories, crop modeling and simulations are effective tools for configuring the optimal growth environment. The objective of this study was to develop a coupled photosynthetic model of sweet basil (Ocimum basilicum L.) reflecting plant factory conditions. Light response curves were generated using photosynthetic models such as negative exponential, rectangular hyperbola, and non-rectangular hyperbola functions. The light saturation and compensation points determined by regression analysis of light curves using modified non-rectangular hyperbola function in sweet basil leaves were 545.3 and 26.5 μmol·m-2·s-1, respectively. The non-rectangular hyperbola was the most accurate with complicated parameters, whereas the negative exponential was more accurate than the rectangular hyperbola and could more easily acquire the parameters of the light response curves of sweet basil compared to the non-rectangular hyperbola. The CO2 saturation and compensation points determined by regression analysis of the A-Ci curve were 728.8 and 85.1 μmol·mol-1, respectively. A coupled biochemical model of photosynthesis was adopted to simultaneously predict the photosynthesis, stomatal conductance, transpiration, and temperature of sweet basil leaves. The photosynthetic parameters, maximum carboxylation rate, potential rate of electron transport, and rate of triose phosphate utilization determined by Sharkey’s regression method were 102.6, 117.7, and 7.4 μmol·m-2·s-1, respectively. Although the A-Ci regression curve of the negative exponential had higher accuracy than the biochemical model, the coupled biochemical model enable to physiologically explain the photosynthesis of sweet basil leaves.
Joon Kook Kwon,Bekhzod Khoshimkhujaev,Kyoung Sub Park,Hyo Gil Choi,Jae-Han Lee,In Ho Yu 한국생물환경조절학회 2014 생물환경조절학회지 Vol.23 No.4
소형 비닐하우스에 2종류의 기능성 필름과 관행의 PE 필름을 피복하고 청치마, 적치마, 치커리 등 3종의 엽채류를 재배하여 기능성필름의 특성을 검토하였다. 2종류의 기능성 필름은 PO(polyorefine)계수지로 만들어졌으며, 엽채류는 흙과 펄라이트를 혼합한 배지에서 육묘하였다. 필름의 광학적 특성에 있어서 기능성 필름은 관행의 PE 필름과 비교하여 광합성 유효광(400-700nm)의 투과율이 높고 자외선(300-400nm)의 흡수율이 높았다. 피복 3개월 후의 광합성 유효광 투과율의 감소 수준은 기능성필름이 PE필름보다 작았다. 이 같은 요인으로 인해 엽채류의 생육과 수량이 기능성 필름을 피복한 하우스에서 높았다. Three leaf vegetables, namely green lettuce, red lettuce (Lactuca sativa) and red-veined chicory (Cichorium intybus) were grown in minigreenhouses covered with two new functional films and conventional polyethylene film (PE). Seedlings of leaf vegetables were transplanted in a plastic troughs filled with soil-perlite mixture. Two functional films were made from polyolefin (PO) material. Measurement of optical characteristics showed that polyolefin films have better transmittance for the photosynthetic active radiation (PAR, 400-700nm) and higher absorptance for the ultraviolet radiation (UV, 300-400nm) in comparison with the conventional PE film. After three months of utilization higher loss in PAR transmittance was observed for conventional PE film. Leaf vegetables growth was enhanced and yield was increased in greenhouses covered by new functional films.