Self-Watering Soil Graphic (IMAGE) University of Texas at Austin Caption The soil pulls water out of the air during cooler, humid periods at night and then releases it when activated by solar energy during the day. Credit University of Texas at Austin Usage Restrictions None 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.