Understanding Biodegradable Mulches, Microbes and Isotopes with Sean Schaeffer and Jacob Clements

In this episode of Mulch Matters, host Dr. Nataliya Shcherbatyuk sits down with University of Tennessee researchers Dr. Sean Schaeffer and Jacob Clements to explore the unseen world beneath our feet, where biodegradable mulches, soil microbes, and even carbon isotopes reveal surprising stories. Together, they break down what happens to soil‑biodegradable mulches (BDMs) once they enter the soil, how microbes physically and chemically transform plastic into smaller fragments, and why climate factors like temperature, moisture, and soil texture play such a big role in decomposition. Jacob offers an inside look at his cutting‑edge use of carbon‑13 and carbon‑14 isotope tracing, explaining how these tools help scientists pinpoint exactly where mulch‑derived carbon ends up and which microbes are doing the work. The conversation also addresses farmers' biggest concerns when switching from polyethylene mulch to BDMs—including cost, aesthetics, degradation rate, and soil health impacts. Sean and Jacob share new findings from multi‑state research in Washington, Florida, Nebraska, California, and beyond, highlighting where BDMs break down fastest and why. Finally, the episode explores the policy gaps surrounding biodegradable mulches in the U.S., what definitions and standards are still missing, and how future regulations could encourage more sustainable agricultural practices. If you're curious about plastic pollution, soil health, microbial ecology, or the future of sustainable farming, this episode offers a clear and fascinating deep dive into the science shaping tomorrow's mulch technologies.   Note: intro and outro music credit to Zakhar Valaha from Pixabay https://pixabay.com/music/introoutro-motivational-ident-main-9923/