Pratt collecting soil sample (IMAGE) American Society of Agronomy Caption Richard Pratt uses a probe in the tepary bean research plots to obtain a soil sample. The samples will be sent to an analytical lab to measure levels of nutrients and microbes (mostly bacteria and fungi) in the soil. Credit Josh Bachman Usage Restrictions For use with this 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.