Soil Test (IMAGE) American Society of Agronomy Caption Lead researcher Lance Conway conducts a soil test on one of the research plots used in the study he authored on claypan soils. Credit Matt Yost Usage Restrictions Please use with story 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.