The influence of plasma discharge on the nutrient components (NO3-N, NH4-N, PO4-P, K, Ca, and Mg) and water quality [pH, ORP (oxidation-reduction potential) and electric conductivity] of hydroponic water were investigated. It was observed that the NH4-N, PO4-P, K, Ca, and Mg were kept at the constant concentrations for plasma discharging of 90 min. On the other hand, NO3-N concentration was increased with proceeding of the plasma discharge. The increase of NO3-N concentration was considered with the fact that nitric acid was created from nitrogen among supplying air for the insulation of inside of dielectric barrier. ORP and electric conductivity was increased with plasma discharging time. However, pH was decrease with what because of the generation of the nitric acid. When adjusting the hydroponic ingredients, pH and conductivity must to be considered because of the change of pH and conductivitiy with the discharging.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료
  2.2. 분석 및 측정
 3. 결과 및 고찰
  3.1. 방전에 따른 NH4-N, NO3-N 및 PO4-P 변화
  3.2. 방전에 따른 pH, ORP 및 전기전도도의 변화
  4. 결 론
  참 고 문 헌

• 김동석(대구가톨릭대학교 환경과학과) | Dong-Seog Kim (Department of Environmental Science, Catholic University of Daegu)
• 박영식(대구대학교 기초교육원) | Young-Seek Park (Faculty of Liberal Education, Daegu University) Corresponding author