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윤진주 ( Jin-ju Yun ),강세원 ( Se-won Kang ),박종환 ( Jong-hwan Park ),서동철 ( Dong-cheol Seo ),김현우 ( Hyun-woo Kim ),조주식 ( Ju-sik Cho ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.3
BACKGROUND: Most lakes have increased concerns about water pollution due to the inflow of non-point sources caused by human activities. Therefore, the lake water quality survey was conducted in order to propose effective plans for water quality management by analyzing the characteristics of lakes and the change of water quality. METHODS AND RESULTS: In order to investigate the physicochemical water quality in Daedong lake, water quality analysis was undertaken from July 2018 to June 2019. Water temperature was ranged from 7.8 to 34.3℃ and pH varied from 6.9 to 10.2. The concentration of Dissolved oxygen, Suspended solid, Biochemical Oxygen Demand (BOD), and Chemical Oxygen Demand (COD) were 5.6 ~ 17.2 mg/L, 2.4 ~ 35.3 mg/L, and 4.5 ~ 15.1 mg/L, and 0.9 ~ 2.8 mg/L, respectively. The Total Nitrogen (T-N) concentration ranged from 0.974 ~ 2.126 mg/L, and Total Phosphorus (T-P) concentration ranged from 0.014 ~ 0.057 mg/L. The Chlorophyll-a (Chl-a) ranged from 2.7 ~ 37.9 mg/m<sup>3</sup>. Through Carlson TSIm assessment using T-P and Chl-a results, evaluating trophic state, Daedong lake was evaluated as mesotrophic. CONCLUSION: Water pollution management plan needs such as nutrient removal technology and nonpoint source management for prevention of eutrophication in Daedong lake.
윤작재배지에서 작물 생산성 개선과 토양 질 보존을 위한 적합한 바이오차 시용 수준 조사
강세원 ( Se-won Kang ),윤진주 ( Jin-ju Yun ),조주식 ( Ju-sik Cho ) 한국환경농학회 2019 한국환경농학회 학술대회집 Vol.2019 No.-
A field experiment was carried out to investigate crop productivity, emissions of CO<sub>2</sub> and N<sub>2</sub>O, and soil quality from upland condition treated with compost and biochar (BC) derived from soybean stalk at various rates during crop growing seasons in corn-Chinese cabbage rotation system. The BC derived from soybean stalk was applied at rates of 5, 10, 15, and 20 t ha<sup>-1</sup> with compost (BC5, BC10, BC15, and BC20, respectively), and BC0 (control). The results showed that crop productivity and emissions of CO<sub>2</sub> and N<sub>2</sub>O varied significantly among biochar application rates. Irrespective with biochar application rates, the application effect on crop productivity was improved on 11.2-29.3% (average 17.0±8.3%) in corn cultivation and 10.3-39.7% (average 27.8±12.7%) in Chinese cabbage cultivation, compare to control treatment. The emission peaks of CO<sub>2</sub> and N<sub>2</sub>O mainly appeared at the early stage of crop cultivation period, and low emission of CO<sub>2</sub> and N<sub>2</sub>O mainly appeared at fallow season. Especially, the CO<sub>2</sub> emission (soil respiration) observed significant difference between biochar application rates and the corresponding control both in the cropping seasons of corn and Chinese cabbage, respectively. In the two cropping seasons, overall N<sub>2</sub>O emission was observed significantly decreased under BC5, BC10, BC15, and BC20 as compared to control, ranging from 11.1 to 13.6%, 8.7 to 15.4%, 23.1 to 26.0%, and 15.0 to 19.6% (average 16.9% in corn cropping season and 16.3% in Chinese cabbage cropping season). After final crop harvest, the soil quality showed that bulk density, SOC, pH, and CEC was significantly improved compare to control under biochar application rates. These results show that the biochar with compost offers an appropriate alternative strategy to achieve higher crop productivity and improved soil quality in upland condition. In conclusion, proper application of biochar with compost has the concomitant advantage of enriching soil quality for long-term sustainable agriculture with potential to reduce inorganic fertilizer inputs.
점토광물 기반 토양개량제 시용에 따른 무의 초기 생육 특성 평가
조한나(Han-Na Cho),윤진주(Jin-Ju Yun),박재혁(Jae-Hyuk Park),이승규(Seung-Gyu Lee),김소희(So-Hui Kim),조주식(Ju-Sik Cho),강세원(Se-Won Kang) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
점토광물은 넓은 표면적, 높은 수분 보유력 및 유효수분 등의 물리적 특성을 가지고 있고, 양이온 교환능력과 같은 중요한 화학적 성질을 가지고 있다. 이로 인해 점토광물의 농업적 이용은 점토광물의 높은 비표면적과 전하를 가지는 것을 이용하여 주로 토양을 개량하기 위한 용도로 사용되고 있다. 따라서 본 연구는 점토광물 기반 토양개량제를 사용하여 밭 토양의 지력과 작물의 생육을 증진시키기 위해 무 재배 연구를 수행하였다. 본 연구에 사용된 점토광물 기반 토양개량제는 몬모릴로나이트 기반으로 제조된 토양개량제를 사용하였고, 일반적으로 농가에서 사용하는 무기질 비료와 퇴비를 이용하여 작물재배에 사용하였다. 처리조건은 대조구 (Cn), 점토광물 (Mont), 무기질 비료 (IF), 무기질 비료 + 점토광물 (IF+Mont), 퇴비 (CP), 퇴비 + 점토광물 (CP+Mont)로 나누었다. 무의 초기 생육 특성은 전반적으로 IF+Mont 및 CP+Mont가 Mont, IF 및 CP의 단일처리에 비해 증가되는 경향이었다. 몬모릴로나이트는 작물의 생육에 필요한 무기성분이 미량 함유되어 있지만, 넓은 표면적으로 인해 양이온 교환능력을 증가시킬 수 있는 능력을 가지고 있다. 이와 같은 특성으로 인해 몬모릴로나이트와 무기질 비료 또는 퇴비와의 혼합시용 처리조건에서 무의 초기 생육이 증가한 것으로 판단된다. 따라서, 작물 재배에 점토광물을 이용하는 것은 친환경 저탄소 농업을 수행하면서 작물의 생산성을 기대할 수 있을 것으로 판단된다.