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오명협,현재욱,박원표,현해남 한국유기농업학회 2020 韓國有機農業學會誌 Vol.28 No.2
The aim of the present study was to investigate the suppressive effects of the bio-sulfur used by eco-friendly farms on the outbreak of citrus scab. To evaluate the inhibiting effect of bio-sulfur on citrus scab germ tube growth, the citrus scab pathogen Elsinoe fawcettiiwas cultured in PDB and agar media, and germ tube growth was observed after bio-sulfur treatment. At both 40 and 88 h after inoculation, germ tube formation was inhibited by 500-, 1000-, and 2000-fold diluted bio-sulfur, and at dilutions above 4000-fold, germ tube formation was observed, although growth was still inhibited, when compared to untreated cultures. Meanwhile, the occurrence of citrus scab on spring-flush leaves in the field was 40.3% in the untreated control and 5.3, 10.3, 12.3, 15.3, and 24.0% when treated with imibenconazole, 2-4 and 6-6 lime-Bordeaux mixtures, which are also used by eco-friendly farms, 500-fold diluted bio-sulfur, lime sulfur, and 1000-fold diluted bio-sulfur, respectively. The occurrence of citrus scab on citrus fruit was 79.3% in the untreated control and 4.0, 33.8, 42.0, 43.3, 44.8, and 78.0% when treated with imibenconazole, 2-4 lime-Bordeaux mixture, 6-6 lime-Bordeaux mixture, 500-fold diluted bio-sulfur, lime sulfur, and 1000-fold diluted bio-sulfur, respectively. Because citrus scab can infect citrus leaves as early as May, as the spring flush begins, preventative control should be implemented by mid- to late-April, thereby increase disease control and reducing both labor and farming costs.
바이오 황의 노지 감귤 검은점무늬병 및 귤응애에 대한 효과
오명협,박원표,현해남 한국환경과학회 2020 한국환경과학회지 Vol.29 No.10
In this study, we investigated the effects of the eco-friendly chemical bio-sulfur, on the citrus melanose-causing pathogen, Diaporthe citri, and on the pest, Panonychus citri. In an open field experiment with a plot-scale application of the chemicals: Mancozeb, lime sulfur, lime sulfur + machine oil, and bio-sulfur, the control group showed 70.6% disease severity compared with 10.3% for the Mancozeb-treated group. Among the eco-friendly treatments, disease severity was the lowest for the group treated with lime sulfur + machine oil (32.2%) and was 53.9%, 58.8%, and 58.1% following treatment with lime sulfur, and bio-sulfur diluted 500 and 1000 times, respectively. The proportion of diseased fruit showed similar results, suggesting that bio-sulfur is an effective alternative to lime sulfur. Three days after treatment acaricidal effects on P. citri showed a 197.6% control survival rate whereas the machine oil, and bio-sulfur diluted 500 and 1000 times treatments showed rates of 2.9%, 5.8%, and 9.0%, respectively. After three days, the control value for bio-sulfur diluted 1000 times was 73.2% compared with the values for the machine oil (96.4%) and bio-sulfur diluted 500 times (94.6%) treatments. Therefore, we suggest that additional research is needed on the combined application of bio-sulfur and oils to enhance the additive control effect on citrus melanose and Panonychus citri.
제주지역 시설재배에서 국내육성 ‘스위트골드’ 결과모지 전정시기에 따른 과실의 생장과 품질의 변화
김보화,오명협,고혁상,양원석 제주대학교 아열대농업생명과학연구소 2023 아열대농업생명과학연구지 Vol.39 No.2
본 연구는 ‘스위트골드’(Sweet Gold)의 결과모지 설정을 위하여 시기별 전정처 리 후 확보된 결과모지에 대한 생육 및 과실 품질을 알아보기 위하여 추진하였 다. 생육기 전정 시기에 따른 결과모지의 굵기는 2021년과 2020년 모두 무처리구 가 다른 처리구에 비해 굵었으며, 결과모 지에서 측지의 발생 상황은 2021년 무처 리구 3.34개로 81.1% 발생하였고, 2022년 무처리구 6.51개로 98.3% 발생하여 다른 처리구에 비해 많이 발생하였다. 과실의 크기는 무처리구가 횡경, 종경이 50mm, 70mm로 다른 처리구에 비해 더 비대하 였다. 후숙 전 당도는 2021년은 무처리구가 9.0 °Brix로 다른 처리구에 비해 1.0Brix 이상 높았으며, 건물률도 2021년은 무처리구가 17.6%로 다른 처리구에 비해 2.0%이상 높았다. 제주지역 시설재 배에서 ‘스위트골드’ 품종의 경우 이듬해 착과될 결과모지는 봄에 발생한 가지를 그대로 사용하는 것이 좋은 것으로 생각 된다. This study was conducted to investigate the growth and fruit quality of established fruiting mother branches after seasonal pruning treatment in ‘Sweet Gold’. The thickness of the fruiting mother branches according to pruning times was thicker in the untreated group compared to other treatment groups in both 2021 and 2020. The occurrence of lateral branches on the fruiting mother branches was notably higher in the untreated group, accounting for 81.1% with 3.34 branches in 2021 and 98.3% with 6.51 branches in 2022, compared to other treatment groups. The fruit size in the untreated group was larger, with a fruit width of 50mm and a fruit length of 70mm compared to other treatment groups. Moreover, the soluble solids contents on October 22, 2021 in the untreated group was 9.0 °Brix, which was more than 1 °Brix higher compared to other treatment groups. Additionally, the dry matter content in 2021 was notably higher in the untreated group at 17.6%, which was more than 2% higher compared to other treatment groups.
‘스위트골드’ 키위에서 과실 성숙기 토양수분 조절에 따른 광합성 및 과실품질의 특성
박재홍,오명협,고혁상,송관정 한국국제농업개발학회 2023 韓國國際農業開發學會誌 Vol.35 No.3
Yellow-fleshed Sweet Gold kiwifruit on Jeju Island were studied to examine how irrigation and soil moisture control affected changes in photosynthetic traits and fruit quality during fruit maturation (120 to 170 days after full bloom). Concerning photosynthetic characteristics, the photosynthetic rate decreased by 10-19%, stomatal conductance by 24-47%, and transpiration rate by 8-25%, when compared to conventional irrigation, as irrigation was reduced and soil moisture content decreased. Fruit weight showed a tendency to increase until harvest, and while a lower soil moisture content led to a less pronounced increase in fruit weight, this difference was not statistically significant. The dry matter rate exhibited a similar trend to the change in fruit weight. Sugar content demonstrated a continuous increase after 130 days, with lower irrigation amounts resulting in higher levels of sugar content due to decreased soil moisture. The Hue value (h°) exhibited a continuous decrease after 140 days from full bloom, correlating with declining soil moisture content. After 130 days from full bloom, soluble sugar content increased rapidly while starch content gradually decreased after 150 days from full bloom. However, with conventional irrigation, the increase in soluble sugar content tended to be less noticeable. This study confirmed that in yellow-fleshed ‘Sweet Gold’ kiwifruit, managing irrigation and soil moisture reduction during the ripening period can lead to decreased fruit weight but increased dry matter, sugar content, and expression of flesh color, ultimately enhancing fruit quality and expediting ripening.
강호준,박원표,오명협 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.4
In this study, we developed an equation to determine nitrogen fertilizer rates for ‘Shiranuhi’ mandarin [(Citrusunshiu × C. sinensis) × C. reticulata] growing soils in plastic film houses to prevent salt accumulation andmaintain optimum nutrient levels. We analyzed the amount of applied fertilizers, soil chemical properties, andyields from 45 farms that vary in salt concentrations on Jeju Island, Korea. The results revealed that theaverage soil chemical property values, such as electrical conductivity (EC), available P2O5, and exchangeablecations (K+, Ca2+, and Mg2+), were higher than the acceptable range, except for pH and organic matter. Theresults showed that higher amounts of nitrogen and phosphorus were applied through fertilizer applicationrates (N 327 kg ha-1, P2O5 294 kg ha-1, and K2O 236 kg ha-1) than the standard amount and rate of fertilizer forthe cultivation of ‘Shiranuhi’ mandarin. The EC values and NO3-N concentration in the soils had a closecorrelation (r = 0.96, p < 0.001). The yields did not differ with the amounts of the applied fertilizers whilethere was a significant negative correlation with EC values (r = -0.455, p < 0.01) and the concentration ofNO3-N (r = -0.476, p < 0.01) in the soils. Our results demonstrated that the NO3-N concentration in the soil ofplastic film houses has a substantial effect on the soil EC value. Soil EC levels may determine therecommended nitrogen fertilizer rates depending on each tree’s age.