Rebuilding soil microbiomes in high-tunnel agricultural systems focus of study Research conducted by microbial ecologists in Penn State’s College of Agricultural Sciences aims to help farmers rebuild healthy soil microbiomes after a soil-clearing event. Image: Pexels Rebuilding soil microbiomes in high-tunnel agricultural systems focus of study Amy Duke February 08, 2021 UNIVERSITY PARK, Pa. — The presence of high salt and nitrogen concentrations in high- tunnel soils may make it more challenging to rebuild a healthy soil microbiome following a soil-clearing event, according to microbial ...