• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.981-985
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• 2009

본 연구에서는 SWAT 모형을 이용하여 경지 불투수면 변화에 따른 유역 수문 영향을 분석하였다. 경안천유역의 경안 수위표 상류유역을 대상유역으로 선정하여 유역의 수문 자료를 수집하였으며, 대상유역의 위성영상 및 항공사진을 수집하고 원격탐사기법 및 지리정보시스템 이용하여 경지 불투수면을 고려한 토지피복도 및 수치지형자료 등을 구축하여 SWAT 모형의 적용성을 평가하였다. 1999년부터 2002년까지의 대상유역의 자료를 이용하여 유출량에 대하여 모형의 보정과 검정을 수행하였으며, 그 결과 모형이 적용성이 있는 것으로 평가되었다. 경지 불투수면 변화 시나리오를 작성하고 구축된 모형을 이용하여 시나리오에 따른 유역 수문 영향을 분석하였다. 총 유역 면적에 대한 시설재배지 면적 비율이 5.7%$^{\sim}$ 12.4%로 변화함에 따라 1.2%인 2002년 토지이용도를 이용한 모형의 모의결과에 비해 평균 유출량은 0.8%$^{\sim}$1.6% 증가하였으며, 지표 유출량과 측방 유출량을 포함한 직접유출량은 2.4%$^{\sim}$5.7% 증가하였으며, 이 중 지표 유출량은 5.7%$^{\sim}$14.2% 증가하는 것으로 나타났다. 지하수 유출량은 10.7%$^{\sim}$27.7% 감소하고 증발산량은 1.5%$^{\sim}$3.4% 감소하는 것으로 분석되었다.

• Korean Journal of Soil Science and Fertilizer
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• v.33 no.2
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• pp.121-126
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• 2000

Composition of fungal communities in three microhabitats such as soil, rhizosphere and rhizoplane were studied to understand the root environment of healthy and diseased plants in Phytophthora non-infested and infested fields, respectively. Samples were collected from the tomato- and red pepper-growing greenhouses in Kyungsang-Nam Province on April, 1999. Twenty-five species were isolated from each vegetation field using the dilution plate technique. There were a greater variety of species in infested fields than non-infested and in soils than in both rhizospheres and rhizoplanes. The number of species isolated were varied amongst the different microhabitats. A Trichoderma species was isolated only from non-infested fields.

• Korean Journal Plant Pathology
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• v.12 no.4
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• pp.428-431
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• 1996

참외, 수박, 오이의 주요 시설재배단지인 경북 성주, 칠곡, 고령에서 1992년부터 3년간 이들의 주요 병해인 덩굴쪼김병, 덩굴마름병, 탄저병, 노균병, 흰가루병 및 잿빛무늬병의 연작수해에 따른 발생량을 조사하여 이들 병의 방제 기초자료로 활용코자 하였다. 토양전염성병균에 의한 병해인 덩굴쪼김병, 탄저병 및 참외와 수박의덩굴마름병은 연작해수가 많을수록 유의적으로 발병율이 증가하였다. 덩굴쪼김병의 경우는 1∼3년과 10년 이상 지배지에서 참외 0.6%와 2.5%, 오이 0.3%와 4.2%, 수박 0.7%와 3.3%로 전체적으로 발병율이 낮아 연작에 따른 발병율의 차이가 작았으나, 덩굴마름병과 탄저병은 이 두재배지의 차이가 커 연작장해가 심하게 나타났다. 세 박과 식물중에 수박이 연작에 따른 병발생율 증가 폭이 다소 높았다. 토양전염성병이 아닌 참외와 오이의 노균병과 흰가루병, 오이의 잿빛 무늬병은 연작수해에 따른 병발생의 유의적인 차이가 없었고, 이들 병해는 발생은 시설재배지의 재배환경과 밀접한 관련이 있었다.

• Research in Plant Disease
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• v.10 no.1
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• pp.58-62
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• 2004

Contamination level and characteristics of Ralstonia solanacearum in soil of greenhouses cultivating tomato plants in Chungbuk province was determined. R. solanacearum was isolated with the semiselective media in 27 greenhouse soil samples out of 133 greenhouses soil investigated, which indicates 20.3 ％ of tomato cultivating greenhouses in Chungbuk contaminated with the bacterial wilt pathogen. Density of R. solanacearum was estimated to 10$^{2.4}$ cfu/g in the contaminated soil. All 71 isolates of R. solanacearum which containing 12 isolates from the diseased tomato plants were race 1, ann 35 isolates of them were biovar 3 and 36 isolates were biovar 4. More than 88％ of 71 isolates were inhibited growth on nutrient agar containing oxolinic acid 0.5 $\mu\textrm{g}$/ml, streptomycin 25 $\mu\textrm{g}$/ml, tetracycline 5 $\mu\textrm{g}$/ml and cupric sulfate 375 $\mu\textrm{g}$/ml (1.5 mM). The 11.3％, 4.2％ and 5.6 ％ of the isolates can grow on nutrient agar containing 10 times more oxolinic acid, streptomycin, tetracycline than minimal inhibitory concentration of the sensitive strains. Five isolates were resistant to 2 bactericides and one isolates was resistant to all 3 bactericides.

• Korean Journal of Plant Resources
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• v.28 no.2
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• pp.263-270
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• 2015

To reduce the injury by continuous cropping system of tomato cultivation, green manure crops (GMCs) such as hairy vetch and rye were applied, Nutrient contributions of N, P₂O₅, K₂O, CaO, and MgO in hairy vetch were 26.2, 5.8, 10.2, 6.6, and 1.5 ㎏/10a, respectively. Nutrient contributions of N, P₂O₅, K₂O, CaO, and MgO in rye were 9.1, 4.2, 11.8, 3.8, and 3.1 ㎏/10a, respectively. After incorporation of GMCs into soil, bulk density in soil with GMCs was lower than that in soil without GMCs (control). In soil after incorporation of GMCs, pH was not different in all treatment conditions, and ranged from 6.37~6.52. EC in soil after incorporation of GMCs was lower than that in soil without GMCs. The OM, T-N, and avail. P₂O₅ contents in soil with GMCs were higher than those in soil without GMCs. The tomato growths were increased in the rotational cropping system (RCS) as compared to continuous cropping system (control and without NPK). Also the density of Pseudomonas corrugata in soil with GMCs was lower than that in soil without GMCs (control). This study suggest that the RCS using GMCs showed lower disease outbreak density in soil for tomato cultivation as compared to RCS without GMCs. Especially, the GMCs was good effect for reduction of continuous cropping injury of tomato.

• Korean journal of applied entomology
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• v.61 no.3
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• pp.409-422
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• 2022

Two dominant thrips in hot pepper (Capsicum annuum) cultivating in greenhouses are Frankliniella occidentalis and F. intonsa in Korea. This study investigated their overwintering physiology. These two thrips were freeze-susceptible and suppressed the body freezing temperature by lowering supercooling point (SCP) down to -15~-27℃. However, these SCPs varied among species and developmental stages. SCPs of F. occidentalis were -25.7±0.5℃ for adults, -17.2±0.3℃ for pupae, and -15.0±0.4℃ for larvae. SCPs of F. intonsa were -24.0±1.0℃ for adults, -27.0±0.5℃ for pupae, -17.2±0.8℃ for larvae. Cold injuries of both species occurred at low temperature treatments above SCPs. Thrips mortality increased as the treatment temperature decreased and its exposure period increased. F. occidentalis exhibited higher cold tolerance than F. intonsa. In both species, adults were more cold-tolerant than larvae. Two thrips species exhibited a rapid cold hardening because a pre-exposure to 0℃ for 2 h significantly enhanced the cold tolerance to a lethal cold temperature treatment at -10℃ for 2 h. In addition, a sequential exposure of the thrips to decreasing temperatures made them to be acclimated to low temperatures. To investigate the overwintering sites of the two species, winter monitoring of the thrips was performed at the greenhouses. During winter season (November~February), adults of the two species were not captured in outside of the greenhouses. However, F. occidentalis adults were captured to the traps and observed in weeds within the greenhouses. F. occidentalis adults were also emerged from soil samples obtained from the greenhouses during the winter season. F. intonsa adults did not come out from the soil samples at November and December, but emerged from the soil samples obtained after January. To determine the adult emergence due to diapause development, two thrips species were reared under different photoperiods. Adult development occurred in all photoperiod treatments in F. occidentalis, but did not in F. intonsa especially under short periods. Tomato spotted wilt virus, which is transmitted by these two species, was detected in the weeds infested by the thrips during the winter season. These results suggest that F. occidentalis develops on weeds in the greenhouses while F. intonsa undergoes a diapause in the soil during winter.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.51-51
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• 2019

참취(Aster scaber)는 국화과에 속하는 여러해살이식물로 취나물로 분류되어 전국에서 재배되고 있으며 주로 남부지역에서 조기재배 작형으로 많이 재배하고 있다. 참취의 잎과 줄기는 맛과 향기가 독특하여 예로부터 생채, 묵나물 등으로 이용되어 왔으며 칼슘, 철분, 비타민 A 등이 풍부하여 건강식품으로서도 가치가 높고 한약재로도 사용되기도 한다. 최근에는 항암효과와 더불어 콜레스트롤을 저하시키는 약리적 효능이 있는 것으로 밝혀져 기능성 식품으로도 각광 받고 있다. 참취 시설재배 시 통상 3년 마다 갱신이 이루어지고 있는데 그 이유로는 시설재배지 특성상 양분의 과다투입에 의한 염류집적과 잦은 관수로 물리성이 악화되어 참취의 생육이 저하되어 수량이 감소하는 결과를 초래한다. 본 연구는 토양개량제 처리에 따른 참취의 생육과 토양 물리화학성에 미치는 영향을 검토하여 참취 시설재배 농가에 활용할 수 있는 방안을 개발하고자 시험을 수행하였다. 2018년 4월부터 2019년 9월까지 전라북도 농업기술원 허브산채시험장에서 참취 시설재배를 대상으로 하고 무처리, 볏짚 1,000 kg/10 a, 왕겨 숯 1,000 kg/10 a, 야자섬유 1,000 kg/10 a, 4처리구로 하여 시기별 생육 및 토양특성을 조사하였다. 수확기 참취 생육특성은 초장은 25.6~27.2 cm, 엽장은 8.5~9.7 cm, 엽폭은 6.3~7.0 cm, 경직경은 4.3~4.6 cm, 및 수량은 $3.3{\sim}4.0kg/3.3m^2$으로 볏짚 처리구에서 대조구에 비해 좋은 생육 상황을 보였으며 수량성 또한 많았다. 시험 후 토양화학적 특성을 조사한 결과 토양 pH는 7.4~7.5, 토양유기물 함량은 34~36 g/kg, 유효인산 함량은 386~415 mg/kg 이었으며 처리 전 토양에 비하여 유기물 함량은 증가하고 유효인산은 낮아지는 경향을 보였다. 치환성 양이온 K, Ca, Mg는 K는 $0.8{\sim}1.0cmol_c/kg$로 낮아졌고, Ca와 $8.9{\sim}10.1cmol_c/kg$, Mg는 $3.1{\sim}3.4cmol_c/kg$로 증가하였다. 토양물리성의 변화는 왕겨숯 시용에서 대조구에 비해 가장 낮은 용적밀도 $1.22g/cm^3$와 가장 높은 공극률 54.09%을 보였다. 토양 삼상은 고상은 볏짚에서 51.98%로, 액상은 야자섬유에서 28.64%로, 기상은 왕겨숯에서 29.35%로 가장 높았다. 참취 시설재배지 토양개량제 시용함으로써 토양의 유기물함량 증가와 토양의 용적밀도 감소와 토양양 공극율 증가 등 토양의 물리 화학성을 개선할 수 있을 것으로 기대된다. 본 연구는 2년차 시험 결과로서 3년차에 재검토할 계획이다.

• Korean Journal of Soil Science and Fertilizer
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• v.44 no.6
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• pp.1169-1175
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• 2011

The soil chemical properties, microbial community structures and biochemical properties of lettuce or cucumber-cultivated greenhouse soil samples were analyzed to assess soil health and characterize microbial distribution in 8 locations in Korea. Although most of chemical properties were within the soil management guidelines, the available phosphate, and the contents of exchangeable potassium and calcium were higher than those of recommended levels. In the culture-dependent analysis, 841 bacterial strains were isolated from the greenhouse soils and were identified at the genus level by 16S rRNA gene sequences analysis. The dominant bacterial genera were Bacillus (35.7%), Microbacterium (9.3%), Arthrobacter (5.7%) and Lysobacter (5.1%). The abundance of pseudomonads was highly variable depending on the soil samples. In the culture-independent analysis, soil microbial community was investigated by using phospholipid fatty acid (PLFA) method. Principal component analysis (PCA) showed that a specific grouping for microbial community structure in the greenhouse soils was not observed based on cultivated crops and investigated sites. The results revealed that the greenhouses soils examined are relatively sound managed in terms of soil chemical contents and microbial properties.

• Korean Journal of Soil Science and Fertilizer
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• v.45 no.6
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• pp.943-948
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• 2012

This study was conducted to estimate the effect of nitrogen reduction by applying ryegrass and to determine the relationship between yield and nitrate concentration of soil solution for cucumber cultivation in plastic film house. Nitrogen levels with recovery of ryegrass ($42.3Mg\;ha^{-1}$) was 0, 50, 75, 100 % of 199 kg N $ha^{-1}$ as N recommendation by determining soil EC value. Yield and nitrate concentration in soil solution was investigated during cucumber cultivation. Yields of N treatments applied ryegrass showed 64.3, 70.9, 70.3, and $76.5Mg\;ha^{-1}$, respectively, it could reduce about 25-50% of nitrogen application compared to yield ($68Mg\;ha^{-1}$) of NPK plot applied 199 kg N $ha^{-1}$. Nitrate concentration in soil solution was average 26.0, 30.1, 41.4, $58.5mg\;L^{-1}$ during cucumber cultivation and was related between yield and average nitrate concentration of soil solution following as; $Y=49.3+0.63X+0.0034X^2$ ($R^2=0.778^{**}$). However, it needs to conduct extra-experiment due to high variation of nitrate concentration during cultivation periods.

• Journal of the Korea Organic Resources Recycling Association
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• v.28 no.3
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• pp.37-44
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• 2020

The Project supporting organic fertilizer started in 1999 as a national policy. In farmhouse, over application of mixed organic compound fertilizer(OC) caused salt accumulation in plastic film house soil. To replace inorganic fertilizer with OC fertilizer, this study was investigated the effect of OC application on yield and soil chemical properties for lettuce cultivation in plastic film house. The OC fertilizer was applied at 50(OC50+N50), 100(OC100), and 150(OC150) % level of the basal amount of nitrogen fertilizer in soil testing recommendation. And these were compared to NPK(nitrogen, phosphat, and potash fertilizer) and PK treatment. The yield of lettuce in OC100 was similar to that of NPK treatment. In OC 50, 100 and 150 treatments, pH had a tendency to increase than that of NPK treatment. Nitrate nitrogen(NO₃-N) and electrical conductivity(EC) were similar to NPK treatment. These showed that nutrients from OC fertilizer were less likely to accumulate in soil than NPK. Also, use efficiency of nitrogen in OC100 treatment were similar to NPK treatment. These results suggest that OC application as the basal dressing at the 100% level could be best to prevent a nutrient accumulation of soil and to increase the yield and commercial quality for lettuce.