Soil and Living Systems

The biological substrate. The patterns and concepts that govern what happens beneath the surface — soil structure and biology, plant-soil feedbacks, microbial communities, water cycling, and the management practices that work with the substrate rather than against it.

This section names the master variables that almost every later entry leans on without re-introducing: soil organic carbon, the soil food web, mycorrhizal networks, the NRCS soil-health principles. It also covers the foundational management patterns — cover cropping, no-till and reduced-till, compost — that the rest of the catalog repeatedly invokes. Where the popular literature romanticizes (“the wood wide web”) or dismisses (“compost tea is unproven”), the entries here cite both the supporting and the skeptical primary literature and tell the reader what is actually known.

The section is concept-heavy by deliberate choice. The biological half of agronomics has a real canon — Howard, the Land Institute, Rodale, NRCS, SARE, Montgomery, Masters, Jones — and the entries here ground that canon in vocabulary the rest of the book can use without re-introducing. Pattern entries that depend on a concept in this section link back to it via depends-on in their Related sections.

Read as the on-ramp to every later section: a financier who needs to diligence a regenerative deal starts here; a CEA engineer who needs to argue against the substrate-eliminates-the-soil-question framing starts here; a working operator who already knows the territory uses the entries to teach a junior technician.