Samuel Haruna, American Society of Agronomy (image) American Society of Agronomy Share Print E-Mail Caption Soil scientist Samuel Haruna samples the soil in order to determine how cover and perennial biofuel crops affect soil temperature. Credit Samuel Haruna Usage Restrictions Please use with story only. Share Print E-Mail 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.