A 24-month formulation that combines the microporous matrix of biochar, slow-release humic and fulvic fractions, and vermicompost biology — a living alternative to fertility built on synthetic inputs alone.
Most commercial compost is pushed through a few weeks of intense heat to finish quickly. Davis Ag also starts with a warm, bacteria-driven phase, but then gives the material time: a long, cooler stretch where fungi and, later, earthworms do the slow work of building humus.
Aged forest material is colonized by native white-rot fungi, the main organisms able to break down lignin, the toughest part of wood. They use oxidative enzymes such as lignin peroxidases, manganese peroxidases and laccases, releasing fragments that feed the formation of complex humic molecules.
Humic and fulvic acids act as natural chelators: they bind micronutrients such as Fe³⁺ and Zn²⁺, keeping them soluble and available near the roots, and they can improve phosphorus availability — without synthetic chelating agents.
The long curing phase lets fungal hyphae spread through the woody matrix. By the time earthworms are introduced, the substrate is already a pre-digested, biologically active food source.
This is the core lesson of Amazonian Terra Preta, where charcoal-rich soils still hold far more stable carbon than the land around them, centuries later.
In contact with moisture and biology, the edges of biochar's aromatic rings slowly oxidize, forming negatively charged carboxyl (–COOH) and phenolic (–OH) groups. These sites hold mobile nutrient cations:
That reduces leaching below the root zone under heavy rain or irrigation.
Biochar's internal surface area ranges from tens to several hundred m²/g, depending on the feedstock and production temperature. Its larger pores, in the micrometre range, give bacteria and fungal hyphae shelter from drying out and from predators; its fine pores hold water.
Values from published literature [1]; not a measurement of this product.Condensed aromatic carbon resists microbial and enzymatic breakdown. Studies of Terra Preta show this charcoal persisting for centuries, which keeps its water-holding pores and nutrient sites working in the soil for the long term.
Glaser et al. 2001 [2]; Lehmann & Joseph 2015 [1].Months 13 to 24 belong to the red wiggler. Living under a cover crop, the worms keep digesting the cured material, turning it into castings with structure and biology that bulk compost rarely reaches.
As organic fragments pass through the worm's gut, they are mixed with mucus and microbes and with calcium carbonate from the worm's calciferous glands. The result helps buffer pH and leaves water-stable micro-aggregates — the crumb structure growers feel in their hands.
Research on vermicompost has detected plant-hormone activity from three groups:
Vermicomposts have also been linked to suppression of some plant pests and diseases [4].
In the field: consistent with what Bagri Produce reported: seeds that "germinate better and faster" and seedlings with "better root development."
Cover crops planted directly on the worm windrows shade the colonies from UV and California heat, hold moisture, and feed the soil food web with root exudates such as sugars and amino acids.
Over 100 years, methane (CH₄) traps about 28 times more heat than CO₂. Landfills are the third-largest source of methane in the U.S. Composting wood and food waste in aerobic, biologically managed windrows avoids landfill methane.
Source: U.S. EPA [6]Converting wood to biochar retains roughly half of its original carbon in stable aromatic form. Left to rot or burned, nearly all of it returns to the atmosphere.
Woolf et al. 2010 [3]; Lehmann & Joseph 2015 [1]The charcoal in Amazonian dark earths has persisted for centuries, with up to 70 times more black carbon than surrounding soils.
Glaser et al. 2001 [2]Fresh organic matter is "labile": microbes respire most of its carbon back to the air within years to decades. Carbon converted into biochar becomes part of the stable pool, measured in centuries. In Jack's kilns, the smoke and gases released during charring are recirculated into a hood that acts as a combustion chamber and burned again, instead of escaping as smoke.
The International Biochar Initiative and the European Biochar Certificate use the molar H/Corg ratio as a stability indicator, with values at or below 0.7 indicating highly condensed, durable carbon. Lab analysis of each production batch is the way to confirm it.
Biochar's porosity and humus's sponge-like structure help soil hold more plant-available water. Bagri Produce reports that the amendment has helped its soil control irrigation water better — a benefit that matters in California's dry seasons.
FocusNutrient retention mechanics, pore structure and long-term persistence of biochar in soils.
FocusPersistent fertility, black carbon content and nutrient-holding capacity of Amazonian dark earths.
FocusLife-cycle assessment of biochar's potential to mitigate greenhouse gas emissions.
FocusEarthworm-derived humic substances and plant-growth regulators; pest and disease suppression.
FocusWhy biochar alone gives limited yield gains in temperate soils — and why biology matters.
FocusMethane's 100-year global warming potential and landfill emissions in the U.S.
Figures on this page describe mechanisms reported in published research. They are not measurements of Davis Ag Terra Preta. For product-specific information, contact the technical team.
Talk with the team about your soil, your crops and how Davis Ag Terra Preta could fit your operation.
