Lettuce in Screen House (IMAGE) American Society of Agronomy Caption The lettuce experiment in the screen house. The pot in the right side is a control while the other pots were fertilized with commercialized phosphorus or water treatment residue and dairy wastewater mix. There is a significant difference in biomass and leaf length between the control and other treatments. Credit Photo by Oren Reuveni Usage Restrictions For use with this news release 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.