(IMAGE) Smithsonian Tropical Research Institute Caption Johana Balbuena, Agua Salud project research technician, and Claire Beckstoffer, co-author, UC Berkeley, working with soil in a tropical pasture. Credit Jefferson Hall, Smithsonian Tropical Research Institute Usage Restrictions Credit: STRI License Original 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.