Biochar for Coffee Production and Soil Health

Coffee production offers several opportunities to put biochar to work, from the soil around mature trees to the growing conditions of young seedlings. Field and nursery research has found improvements in soil properties and plant growth under dry conditions, giving growers practical reasons to consider biochar in their soil-management plans. ^{1, 2}

The opportunity also extends to processing. Pulp and husks left after coffee harvest can become feedstocks for biochar, turning a by-product of one season’s crop into a material for future use. Together, these applications connect healthier growing conditions with a productive use for coffee residues. ^{1, 3}

Building better soil around coffee roots

Biochar can improve several soil properties that matter to coffee production. In a two-year Colombian field trial, coffee-pulp biochar reduced soil density, improved the stability of soil aggregates, and raised pH in acidic soil. Higher application rates also increased water held at field capacity—the moisture remaining after excess water drains. These changes create a stronger foundation for managing water and nutrients around roots. ¹

Research on two Brazilian coffee farms adds evidence for nutrient retention. Biochar increased the soil’s nutrient-holding capacity in the second growing season. Yield responses varied across the farms and seasons, so the useful takeaway is the improvement in soil function rather than an expectation of a fixed harvest increase. ⁴

For growers, soil pH and fertility information help connect these benefits with the existing nutrient program. Our Learning Center article on how biochar affects soil pH explains how to match that property to the soil.

Supporting seedlings through dry conditions

The nursery offers another opportunity: helping young coffee plants maintain growth when water is limited. In a Thai pot trial, Arabica seedlings grown with corncob biochar at 1% of soil weight showed better growth and chlorophyll content under drought conditions. The treatment also improved leaf water status. ²

The rate was important. Higher additions reduced available phosphorus and were less favorable for seedling growth. For nursery operators, the finding points toward choosing a suitable proportion in the growing medium as part of water and nutrient management. The 1% figure describes the tested pot treatment. ²

Our article on biochar and soil water retention explores how biochar’s pores and the surrounding soil influence moisture available to roots.

Giving coffee residues a useful next purpose

Coffee pulp and husks provide a local source of biomass for making biochar. Through pyrolysis, heat and limited oxygen transform the material into a carbon-rich solid. The Colombian soil trial used biochar made from coffee pulp, linking residue conversion directly with a coffee-growing application. ¹

Production choices help shape the finished material. In a coffee-husk experiment, higher pyrolysis temperatures increased fixed carbon content while reducing the amount of biochar produced. Temperature also changed its pH. Those findings give processors useful information for balancing output with the properties needed in a soil amendment. ³

For a processor, the next step is to connect the available residue with a production system and a use for the resulting biochar. Growers can also select suitable biochar made from other biomass sources, as the corncob seedling research illustrates. ²

Connecting soil improvement with carbon storage

Turning biomass into biochar retains some of its carbon in a form that resists decomposition. When used in soil, a portion can remain stored over the long term. That adds a carbon-storage opportunity to the practical uses of coffee residues and other biomass. ⁵

The amount stored depends on the material and soil conditions. Net carbon-removal calculations also account for emissions from production, transport, and application. Considering these factors alongside soil performance helps a coffee business assess both the agricultural and carbon value of a project. ⁵

Putting biochar to work in your operation

The starting point is the job you want biochar to do: improve the soil around producing trees, support nursery plants, or create a useful material from processing residues. That goal guides the choice of biochar, application method, and fit with the existing fertility and water-management program.

Wakefield can discuss product options, material information, quantities, and supply for agricultural soil improvement. Explore Wakefield’s agriculture solutions to connect your growing needs with the next step.

Sources and notes

1. Sánchez-Reinoso et al. The Application of Coffee Pulp Biochar Improves the Physical, Chemical, and Biological Characteristics of Soil for Coffee Cultivation 2023. Two-year Colombian field trial using coffee-pulp biochar and different fertilizer levels. View Source ↩

2. Kullachonphuri et al. Mitigating drought stress in Coffea arabica L. seedlings through soil stabilization with corncob derived biochar 2025. Controlled pot trial with corncob biochar at 1%, 2.5%, and 5% of soil weight. View Source ↩

3. Pimentel et al. How does pyrolysis temperature influence the physicochemical properties of biochar from Coffea canephora husk? 2026. Material properties measured at three production temperatures. View Source ↩

4. Viana et al. Management of Organic Residues in the Coffee Production Chain and their Impact on Soil Attributes for the Promotion of Circular Economy 2026. Two Brazilian farms studied over two growing seasons. View Source ↩

5. Lefebvre et al. Biomass residue to carbon dioxide removal: quantifying the global impact of biochar 2023. Carbon-storage modeling that accounts for production, transport, and application emissions. View Source ↩