• 한국유기농업학회지
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• 제19권spc호
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• pp.199-202
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• 2011

Organic production practices varied among producers. Generally, organic producers were relying on imported input materials such as organic compost and liquid fertilizer even more than conventional producers. Very few organic farmers had composting facilities or sites for the own supply of compost in need. The productivity of organic kiwifruit orchard (92%) was not as low as that of conventional while the net income (243%) was more than double that of conventional. This was mainly attributed to high farm gate price of organic fruits, low paid labour use and electricity. As a consequence, organic kiwifruit production seems to become a feasible option in Korea. However, high dependence on imported farming material, fuel and labour for too frequent liquid fertilizer spray should be addressed to achieve long term sustainability of organic kiwifruit production.

• 원예과학기술지
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• 제31권1호
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• pp.38-49
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• 2013

Prohexadione-calcium (Pro-Ca), ethephon and transient water stress were evaluated in a factorial design, as potential inhibitors of early-season shoot growth of high density orchard management of apple (Malus domestica Borkh.) trees. In the experiment, water stress was imposed to one-half of the 7-year-old 'Golden Delicious'/M.9 apple trees in each of 5 blocks, by stopping irrigation for 3 weeks between 35 and 56 days after full bloom (AFB). Within each whole unit, the following Pro-Ca and ethephon treatments were randomly allocated at $2{\times}2$ factorial: a) 0 or 250 $mg{\cdot}L^{-1}$ a.i. Pro-Ca applied at 28 days AFB and b) 0 or 300 $mg{\cdot}L^{-1}$ a.i. ethephon applied twice (35 and 71 days AFB). All trees were hand thinned to king flowers prior to treatments. Vegetative shoot growth was markedly reduced by Pro-Ca, with its effect being obvious within 14 days after application, while ethephon and water stress treatments were less effective. Pro-Ca had no effect on fruit set and yield but slightly increased fruit size. Ethephon substantially reduced the fruit size and yield but had no effect on fruit set. Water stress reduced fruit set, fruit size and yield. With regard to fruit quality, Pro-Ca did not influence fruit shape, flesh firmness and soluble solids contents (SSC) but slightly reduced titratable acidity. Ethephon had no effect on fruit shape but increased firmness, SSC and acidity, while water stress did not influence these fruit quality attributes. Dry weight of dormant spur buds was reduced by both Pro-Ca and water stress, while increased by ethephon. The larger dormant buds led to the larger spur flowers at the tight cluster stage the following spring. Return flowering was promoted only by ethephon, especially on previous season's shoots. There were no significant interactions between Pro-Ca and ethephon or water stress on most variables observed in this study.

• 한국토양비료학회지
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• 제44권4호
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• pp.575-580
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• 2011

The cultivation of once-over harvest pepper cultivars might be very valuable to Korean farmers who still depend on traditional hand-harvesting method. Thus, we conducted this experiment to obtain important information for enhancing the productivity of once-over harvest red pepper fruits by supplying several nutrient-controlling and growth-regulating chemicals, such as $KH_2PO_4$, $SiO_2$ and 2-chloroethylphosphonic acid (ethephon). Adequate fertilization was provided in each treatment plots. In this study, two once-over harvest pepper cultivars, Saengryeg No. 211 and 213 (SR 211 and SR 213), and one regular piecemeal harvest pepper cultivar, Kangryegdaetong (KRDT), were cultivated to evaluate the productivity of pepper fruit as affected by above chemicals. The distribution of macro- and micro-nutrients in pepper fruits among the cultivars were different in term of N, B, Cu, and Fe concentrations. In particular, the concentration of B in SR 213 was about 2 times higher than that in SR 211 and KRDT. However, overall red pepper productivity of SR 211 was markedly higher ($2.91{\sim}3.38Mg\;ha^{-1}$) than that ($1.68{\sim}2.37Mg\;ha^{-1}$) of SR 213. Also, the productivity of matured red pepper was significantly influenced by the treatments of $KH_{2}PO_{4}$, $SiO_2$ and ethephon. The yield indices for matured red pepper fruits were the highest with the treatment of $KH_2PO_4$ or $SiO_2$ with ethephon, which were 113~116% for SR 211 and 147~150% for SR 213. Thus, the applications of $KH_2PO_4$ or $SiO_2$ with ethephon would be suggested to enhance the productivity of matured red pepper fruit.

• 한국자원식물학회지
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• 제29권3호
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• pp.313-321
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• 2016

Persimmon has long been established as one of the major fruits in Korea. The southern parts of Korea were traditionally the pocket areas for good persimmon production; however, rising temperatures have gradually rendered the southern regions unsuitable for successful harvest. Ecology of fruit growing areas affects the productivity of various types of crops, including fruit trees such as persimmon. The quality characteristics of the fruit of persimmon cv. Dongchul grown in Gangwondo, which lies in the northern part of South Korea, were investigated. Different physicochemical, nutritional, and antioxidant properties of fruit were evaluated to assess the locational effect on the quality of persimmon fruits grown in Gangwondo. The results of this study showed that persimmon cv. Dongchul grown in Gangwondo maintains many of the physicochemical (4.33% crude protein and 4.32% crude fiber), nutritional (total mineral content: 461.51 and vitamin C content: 15.28 ㎎/100 g), and antioxidant properties (polyphenol content: 633.1 ㎎ gallic acid equivalent/100 g) those are found in other three commercial cultivars ‘Daebong’, ‘Kyengsan Bansi’, and ‘Sangju Doongsi’ grown in Korea. Overall results of this study imply that ‘Dongchul’ cultivar of persimmon could commercially be grown in Kangwondo, Korea.

• 생물환경조절학회지
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• 제30권3호
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• pp.175-182
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• 2021

본 실험은 암면과 코이어 배지의 이용에 따른 토마토의 생육, 생산성 및 품질 비교 및 재사용암면 이용가능성을 알아보기 위해 경북 안동시에 위치한 안동대학교 생명과학대학 자동 제어온실에서 진행되었다. 실험결과 토마토의 엽수, 초장, 엽면적은 처리간 차이가 없었으며 줄기직경은 암면배지에서 약간 높은 경향을 보였지만 재사용암면 및 코이어배지간의 차이는 없었다. 과실생산성은 기상 조건에 따라 상이한 반응을 보였지만, 암면, 재사용암면 및 코이어배지간의 큰 차이를 보이지 않았다. 또한 과실의 품질은 배지 내 EC의 농도에 따른 차이를 보였다. 따라서, 수경재배에서 토마토의 생육 및 과실품질은 배지의 종류에 대한 차이가 없었으며 환경 및 급액관리에 따른 영향이 컸다. 본 실험을 통해 토마토 수경재배에서 생육단계별 적정 수분관리기술이 적용된다면 암면의 재사용에 따른 경제성 향상에 기여될 수 있을것으로 판단된다.

• 생물환경조절학회지
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• 제17권3호
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• pp.204-209
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• 2008

본 실험은 여름작형 착색단고추의 낮은 플라스틱연동하우스 재배시 유인방법 에 따른 수량 및 품질을 비교하고자 실시하였다. 유인방법은 직립과 경사유인이었고, 과실은 6월부터 11월까지 한달 간격으로 수량, 평균과중, 과육두께, 당도, 경도, 과형, 심실수 등을 조사하였다. 상품수량은 6월에 가장 많았으며, 직립유인이 경사유인보다 더 많았다. 6월의 평균과중은 경사유인이 232g으로 직립유인보다 26g 더 무거웠으나, 7월 이후 직립유인이 경사유인보다 더 무거웠다. 과육두께는 직립유인이 경사유인보다 두꺼웠다. 당도는 온도가 낮아질수록 높아졌으며, 직립유인이 경사유인보다 더 높았다. 직립유인의 과형은 수확시기에 따른 차이를 보이지 않았다. 직립유인의 심실수는 $3.27\sim3.34$개로 수확기에 따른 차이를 보이지 않았다.

• 한국균학회지
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• 제41권4호
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• pp.225-230
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• 2013

한국 및 일본산 잣버섯 수집균주(21균주)를 소나무 톱밥배지에서 배양하여 그 재배 특성 (균사체 배양기간, 자실체 발생기간, 버섯의 생산량, 자실체의 색상과 형태)을 조사하였다. 잣버섯의 균사체 배양기간은 40~65일, 자실체 발생기간은 6~22일로 나타났다. 자실체 생산성을 조사한 결과, 톱밥배지 600 g당 생중량과 자실체 발생 수는 각각 약 48.3 g과 8.7개였으며, 자실체의 색과 형태는 균주별로 다양하게 관찰되었다. 균긁기 처리군은 미처리군(대조군)에 비해 자실체 발생기간이 길었으며, 생중량과 갓 직경은 감소하였다. 잣버섯의 재배 특성을 비교한 결과, 소나무 톱밥 재배용으로 3균주(KFRI 1199, 1302, 1331)가 가장 적합한 것으로 평가되었다.

• 한국잠사곤충학회지
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• 제47권1호
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• pp.1-4
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• 2005

오디 생산을 위한 재배법 개발을 위하여 원줄기 길이 1m로 하여 원가지를 3~5개 정도로 유지하는 중간만들기 수형으로 유지하였다. 이 때 뽕나무 재배에 적합한 식재거리는 2${\times}$1 m(500주/10a)로 하는 것이 2${\times}$1.5 m(333주/10a)에 비하여 주당수량은 약간 적으나 식재 주수가 많아 단위면적당 수량은 높은 것으로 나타났다. 원가지 길이를 30, 50, 70 및 90 cm로 한 경우 90 cm 처리구에서 오디의 수량이 가장 많았다. 원가지 길이별 주당 가지수는 원가지 길이가 길수록 가지수가 많았으며, 10a당 가지량 및 엽량은 일정한 경향을 보이지 않았다. 식재 거리별 주당 가지수는 식재거리가 넓을수록 가지수가 많았고, 10a당 가지량 및 엽량은 일정한 경향을 보이지 않았다.

• KSBB Journal
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• 제20권6호
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• pp.447-452
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• 2005

본 연구에서는 과일 폐액으로부터 고정화 세포를 이용하여 수소생산을 위한 배양조건을 조사하였다. 각종 과일 폐액 중에 수박 폐액에서 환원당의 함량이 가장 높았으며, 수소생산량은 2319.2 mL/L이었다. 고정화 물질 sodium alginate의 농도와 크기에 따른 수소생산성 효과는 검토범위 내에서는 적었다. 고정화된 비드의 내부 관찰에서 세포가 왕성하게 생육하고 있음을 확인했다. 대사의 효소물질로 이용될 수 있는 각종 아미노산의 첨가는 종류에 관계없이 수소생산성에 영향을 거의 미치지 않았다. 금속이온 $FeSO_4$를 첨가한 결과 최적 농도는 1.2 g/L이고, 1.3배의 수소생산 증가를 나타났다. 수소생산정지 후 배양액의 유기산은 lactic acid와 butyic acid가 가장 많았다.

• 한국환경과학회지
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• 제31권11호
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• pp.951-958
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• 2022

The aim of this study was to determine the optimum level of carbon dioxide to maximize the quality and yields of strawberries cultivated in a greenhouse. Specifically, two strawberry cultivars, namely, 'Seolhyang' and 'Maehyang', were subjected to varying concentrations of carbon dioxide and patterns linked to their productivity were noted. Both cultivars showed improvements across various physical variables (i.e., leaf area, crown diameter, plant height, fresh weight, and dry weight) when carbon dioxide concentrations were at 1,500 ppm. The optimum carbon dioxide concentration for increased fruit yields and quality was 1,000 ppm. When carbon dioxide was at 1,000 ppm the yields of 'Seolhyang' and 'Maehyang' increased by 1.99 and 1.78 times, respectively, compared to control plants. The influence of carbon dioxide on fruit color was negligible. However, the carbon dioxide increased the sugar content and sugar-acid ratio of the experimental fruits compared to control plants. Specifically, the sugar-acid ratio, which is directly related to taste, was at its highest when the concentration of carbon dioxide was at 1,000 ppm (i.e., for both 'Seolhyang' and 'Maehyang'). Overall, the application of carbon dioxide culminated in improved yields and fruit quality for both cultivars of interest.