This study was conducted to investigate the influence of hydrophilic polymer (HP) mixture ratio (Control, 1.0%, 2.5%, 5.0%, and 10.0%) on growth of eggplant (Solanum melongena) for lower maintenance urban agriculture via green roofs. Although it was not statistically significant (p > 0.05), substrate temperature was decreased as hydrophilic polymer mixture ratio were increased. High substrate water content (95%) was found consistently in growing media under elevated hydrophilic polymer mixture ratio at over 5% during the entire growing period. Substrate electronic conductivity was increased as hydrophilic polymer mixture ratio were increased. Growth index was decreased as hydrophilic polymer mixture ratio was increased. It was reduced about 1/3 and 1/5 compared to that of Control in HP5.0 and HP10.0 treatment plants, respectively. Number of leaves, leaf length, and leaf width were decreased in following order: Control> HP1.0> HP2.5> HP5.0> HP10.0 treatments. There numbers were significantly lower in HP5.0 and HP10.0 treatment plants. Dry weight of shoot and root were decreased as hydrophilic polymer mixture ratio was increased. They were reduced by 1/4 compared to those of Control treatment plants. In addition, visual value was decreased as hydrophilic polymer mixture ratio was increased. Plants grown in HP1.0, HP2.5, and HP5.0 treatments all survived. However, plants grown in the HP10.0 treatment had the lowest survival rate (56%) after 3 months of growing. These results indicate that the advantage of adding hydrophilic polymer to green roof growing media may greater during dry periods. However, the proper mixture proportion of hydrophilic polymer should be determined according to different characteristics of growing media and plant species.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 토양 및 식물재료
  2.2. 분석항목 및 방법
 3. 결과 및 고찰
  3.1. 토양
  3.2. 식물생장
  3.3. 생산성
  3.4. 시각적질
  3.5. 생존율
 4. 결 론
 REFERENCES

• 허혜(건국대학교 산림과학과 대학원, Department of Forest Science, Graduate School, Konkuk University) | Hui Xu
• 윤용한(건국대학교 녹색기술융합학과, Department of Green Technology Convergence, College of Science Technology, Konkuk University) | Young-Han Yoon
• 최은영(한국방송통신대학교 농학과, Department of Agricultural Sciences, Korea National Open University) | Eun-Young Choi Corresponding author
• 김원태(천안연암대학교 환경조경과, Department of Environment and Landscape Architecture, Cheonan Yonam College) | Won-Tae Kim
• 주진희(건국대학교 녹색기술융합학과, Department of Green Technology Convergence, College of Science Technology, Konkuk University) | Jin-Hee Ju