Practice

Composting

The managed decomposition of organic materials — plant residues, manure, food scraps — into a humus-rich soil amendment. The oldest and most-foundational soil-building practice, predating written agricultural history. Modern composting spans hot thermophilic windrows (commercial scale), cold backyard piles, vermicompost (worm-mediated), Bokashi (anaerobic fermentation), Johnson-Su bioreactors (recent fungal-dominant innovation), and biodynamic preparations. Compost feeds soil biology, supplies nutrients in plant-available forms, and stabilizes carbon — central to every regenerative, organic, and biological agriculture tradition.

How composting works

Composting is biology accelerated. Soil microbes, fungi, insects, and worms decompose organic matter into stabilized humus when conditions favor it: balanced carbon-to-nitrogen ratio (~25–30:1), adequate moisture (50–60%), oxygen, and time.

In a thermophilic compost (hot pile), microbial activity raises pile temperatures to 130–160°F, killing pathogens and weed seeds, completing primary decomposition in weeks. Cooler mesophilic finishing develops the stable humus over months.

Forms of composting practice

Backyard pile — household scraps and yard waste; cold or warm, slow finish, simplest form
Thermophilic windrow — long, turned piles at farm or commercial scale; weekly turning, hot finish
Static aerated pile (SAP) — perforated pipes provide oxygen without turning; common at municipal scale
Vermicompost — worms (typically Eisenia fetida) digest organic matter into worm castings; very high biological value
Bokashi — anaerobic fermentation with effective microorganisms (EM); buries the result for soil incorporation
Johnson-Su bioreactor — David Johnson and Hui-Chun Su’s static-pile design that produces fungal-dominant compost over a year-long cycle
Biodynamic preparations — specific Steiner-tradition composts and field sprays (BD 500–508)

Why it matters

Compost is not just fertilizer. It is biological inoculant. Each gram of finished compost contains billions of bacteria, fungi, and other microbes — the same biology that makes healthy soil work. Applying compost is, in part, transferring biology from a managed pile to [[soil|the soil]].

The carbon side matters too: compost carbon is partially stable humus that persists in soil for years to decades, building organic matter and [[soil|the soil]]‘s capacity to hold water and nutrients.

Sources

The Rodale Book of Composting, Grace Gershuny et al. (multiple editions)
USDA NRCS composting technical materials
Johnson-Su Bioreactor research, New Mexico State University

Rooted in life.

What links here, and how

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Scientific

substrate of

Soil food web compost is concentrated soil-food-web biology, transferred from a managed pile to the soil

Practical

shares approach with

An Agricultural Testament the book's documentation of the Indore composting process is the foundational practical treatment of large-scale composting in English
Biochar both build soil organic matter; biochar adds long-stable carbon and pore structure, compost adds active labile organic matter and microbiome
Biogas biogas is essentially anaerobic composting that captures the methane; compost and biogas digestate are similar end-products as fertilizers
Charles Dowding the no-dig method is functionally a compost-application method; Dowding's writing on compost is as substantial as his writing on the no-dig technique itself
Garden Fork compost turning is the garden fork's principal continuing use in modern home gardens
No-Dig Gardening no-dig depends on a steady supply of compost as the primary fertility input; the two practices are functionally inseparable
Vermicomposting both convert organic waste into soil amendment; vermicomposting works mesophilic-temperature and small-scale, thermophilic composting works hot and at larger scale

kin of

Indore process Indore is one composting method among several, but historically the most influential

enables

The Soul of Soil the composting chapters are among the most-rigorous American-published treatments of farm-scale aerobic composting

practices

Vermont Compost Company chicken-driven thermophilic composting at commercial scale — birds turn the windrows, eat insects and weed seeds, lay eggs, and the operation produces premium potting media as the substrate output

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