The third episode in a series of four about soil organic matter. Now that we've covered the basics in episodes 1 & 2, this episode gets into more detail about what soil organic matter really is--and the answer is mostly dead microbial cells! Featuring: Johannes Lehmann, Ray Weil, Cynthia Kallenbach.

The first of four episodes devoted to soil organic matter. In this episode, we get into the physical, biological, and chemical role of soil organic matter. Organic matter affects water dynamics, is the food for soil organisms, and contributes to cation exchange capacity. Featuring: Johannes Lehmann, Ray Weil, Ivan Fernandez, and Charlie White.

Second episode in a four part series about soil organic matter. This episode delves into the carbon cycle to get a better understanding of where soil organic matter comes from, with particular attention on photosynthesis and respiration. Featuring: Ray Weil, Johannes Lehmann, Stephanie Yarwood, and Steve Groff.

In the fourth and final episode devoted to soil organic matter, we get into how texture, aggregation, and the microbial community itself affect organic matter storage. Featuring: Stephanie Yarwood, Johannes Lehmann, Charlie White, and Cynthia Kallenbach.