Figure. 2 (IMAGE) Beijing Institute of Technology Press Co., Ltd Caption The pH and EC of the hydroponic media. Credit Space: Science & Technology Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.