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Chungwoo Kim(김충우),Tongmin Sa(사동민) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Long term compost fertilization in paddy field ecosystem is essential to maintain rice yield, soil function and fertility. However, rice fields are a major source of methane production. Monitoring long term fertilizer application and its effects on soil chemistry and the functional microbial populations are important in understanding methanogenesis and methane oxidation in paddy ecosystems. This study evaluates the changes in soil chemistry in paddy fields under long term compost fertilization and their effect on the abundance of methanegenesis, methane oxidation, and methanol oxidation related genes, namely mcrA, pmoA, and mxaF genes, respectively. Soil sampling was done on compost (Com), NPK+compost (NPKCom) and unfertilized (NF) paddy fields. The abundance of mcrA, pmoA and mxaF genes were measured using quantitative PCR (qPCR). Results show that long term compost and NPK+compost fertilization alter the soil chemistry of paddy fields with an overall increase in the organic matter (OM), total nitrogen (TN), P₂O<SUB>5</SUB>, K, Ca, Mg, and dissolved organic carbon (DOC). Consequently, the abundance of mcrA, pmoA and mxaF genes significantly increased in Com and NPKCom treatment compared to the unfertilized NF treatment. The most important soil chemical parameters that significantly and positively affect the abundance of mcrA, pmoA and mxaF genes were organic matter and dissolved organic carbon. When the soil chemical parameters and gene abundance were used as variables for cluster analyses, different fertilization treatments cluster in distinct regions. The Com and NPKCom treatments were characterized by paddy soils with elevated OM, TN, K, and P content, and higher abundance of methanogenesis, methane oxidation and methanol oxidation related genes. Long term compost fertilization of paddy field ecosystem altered the chemical characteristics of paddy fields and consequently affect the abundance of methanogenesis, methane oxidation and methanol oxidation related genes which could affect the process of methane emission and methane consumption.
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이성균,김충우,이경희,이종원,오하경,한종우,김상희,김영호,Lee, Seongkyun,Kim, Chungwoo,Lee, Kyeong Hee,Lee, Jong Won,Oh, Ha Kyung,Han, Jongwoo,Kim, Sang Hee,Kim, Youngho 한국응용곤충학회 2017 한국응용곤충학회지 Vol.56 No.3
Currently, clearwing moths and peach fruit moths are considered economically important pests of jujube in Boeun, Chungbuk, Korea. However, until now, specific studies on occurrence of the major pests of jujube in Boeun area, which could be useful for pest control, have not been carried out. In this study, seasonal occurrence of three pest moths (Synanthedon bicingulata, S. haitangvora, and Carposina sasakii) in jujube orchards was monitored using sex pheromone traps. Synanthedon bicingulata and S. haitangvora were monitored from 2013 to 2015. Adults of both species were captured from May to October, with two peaks in their occurrence: mid-June and mid-September for S. bicingulata, and mid- to late-June and mid- to late-September for S. haitangvora. However, S. haitangvora occurred in lower numbers than S. bicingulata. Adults of C. sasakii were captured from 2014 to 2016. From May to October, two peaks were observed in their occurrence in mid-June and in late-August to mid-September and the second peak was lower than the first. Thus, the life histories of these pest moths of jujube should be studied in detail for an effective pest control.
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근권 저온처리가 상추의 질산태 질소 흡수 및 함량에 미치는 영향
양진철,박명수,김충우,정희경,사동민 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-
질산태 질소의 일중 농도변화와 단기간의 저온 처리가 질산태 질소의 흡수 및 농도에 미치는 영향을 살펴보고자 상추(Lactuca sativa L.)를 공시 작물로 하여 온실에서 수경재배하였다. 질산태 질소의 농도는 엽신에 비하여 주맥에서 일중 지속적으로 2배이상 높았으며, 질산태 질소의 일중 변화는 1400까지 지속적으로 감소하여 최저치(8.7 mg-N/GDW)를 나타낸 후 다시 증가하였다. 질산태 질소의 일중 흡수량은 1100∼1700에 평균 4.8 mg-N/GDW-Root/Hour로 최대치를 나타내었다. 단기간의 저온 처리는 엽의 질산태 질소의 농도를 14∼18%, 질산태 질소의 흡수량을 50∼55%를 감소시켰다. 이러한 결과는 수확 전 단기간의 저온처리가 상추잎의 질산태 질소함량을 낮출 수 있는 방법으로 응용될 수 있음을 보여준다. Lettuce (Lactuca sativa L.) plants were grown under hydroponic system to characterize the diurnal change of nitrate concentration and nitrate uptake rate and to examine the effect of short term cold treatment to rhizosphere on nitrate concentration and uptake rate in lettuce plant. The nitrate concentrations in midrib were two times higher than those in leaf. Nitrate concentration in the shoot reached to minimum (8.7 mg-N/GDW) at 1400 and, thereafter, increased continuously until 2300. During 1100∼1700, nitrate uptake by lettuce plant was maximum (4.8 mg-N/GDW-Root/Hour). Short term cold treatment reduced nitrate concentration in the shoot by 14∼18%, and nitrate uptake rate by 50∼55%, respectively. These results showed that short term cold treatment before harvest could be applied for the purpose of reduction of nitrate concentration in the leaf under hydroponic culture.
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