Challenge: Substitution of peat (non-renewable) with other organic materials to enhance the circular economy

Biochar4Vines: A Circular, Low-Emission Alternative to Peat

Summary

This proposal introduces a decentralized, low-cost system for peat substitution in vineyards by producing high-quality biochar on-site using locally manufactured Ring of Fire flame-cap kilns. The process converts vineyard pruning’s and other organic waste—sourced both from on-farm residues and from DEDISA’s waste management (Φυτοχώματα) program—into biochar, which is then blended with high-quality compost. The resulting fermented biochar-compost improves soil water retention, nutrient efficiency, and long-term carbon storage while reducing greenhouse gas emissions by over 50% compared to conventional pile burning.
Unlike experimental or academic projects, this pilot is designed for immediate application, using proven tools, local manufacturing, and circular waste systems already in operation.
The proposal is led by the Porto Protocol as facilitator and knowledge network, and CHARR as technical lead—bringing decades of combined field, MRV (Monitoring, Reporting and Verification), and biochar implementation experience. CHARR partners with Wilson Biochar, a U.S.-based pioneer with over 20 years of field-tested knowledge in low-tech biochar systems. This solution is not a lab experiment—it’s a climate-smart, field-ready, circular system designed for wine farms, with replicable potential across Europe.
This project will test the model across selected vineyards in Greece, ensuring that all partners—especially local waste management (DEDISA) and participating farms—are fully integrated into the circular system.

Foreseen impact

Agronomic and Soil Benefits

• Elevated Soil Organic Carbon:+0.42% Soil Organic Matter (SOM) increase (Oasis Vineyard trial, California USA - https://pacificbiochar.com/oasis-vineyard-field-trial-with-biochar-and-compost-_-6th-harvest-report/)
• Yield Increases: 25–35% vineyard yield increases over multiple seasons
• Enhanced Soil Water Holding Capacity: Improved drought resilience through enhanced water-holding capacity due to Biochar’s porous structure.
• Improved Nutrient Efficiency: Reduction in fertilizer leaching and synthetic input needs
• Optimized pH levels through EM1/bokashi fermentation

Added Agronomic and pH-Specific Benefits:

• pH Balancing: Bokashi/EM-1 fermentation addresses the concern around applying high-pH biochar to calcareous or alkaline soils (common in Greek vineyards). By stabilizing the biochar-compost mix at pH 6–7, this method improves compatibility with vine root systems and local soil biology.
• Enhanced Product Value: The EM-1-enhanced compost-biochar mix offers better odor control, more consistent fermentation, and longer shelf life — characteristics valued in high-end horticultural applications.
• Peat Replacement Performance: Trials referenced in Wilson’s guide show that these biochar-compost-bokashi blends outperform traditional compost alone in plant trials, making them ideal for nursery use and vineyard planting rows.

Economic and Value-Added Benefits

• Value Creation from Organic Waste: By converting on-farm residues and municipal woody waste into high-quality biochar, farms can replace expensive Peat with an in-house produced input, saving on input costs.
• Premium Bio-Compost Product: Blending biochar with DEDISA’s compost creates a product that sells at a premium—potentially doubling or tripling the value compared to standard compos Compost + biochar product valued at 2–3× the market price of standard compost
• Estimated biochar value: €3,600–€17,550 per farm (market price €400–1,950/ton)

Environmental Impact

• Significant Carbon Sequestration: Each biochar burn stored approximately 2 tCO₂e, with cumulative removals of 200 tCO₂e in Pilot Phase 1. Over 80% of the carbon in biochar remains stable in soil for more than 100 years.
• Reduction in GHG Emissions: The technology achieves over a 50% reduction in emissions compared to open pile burning.
• Waste Diversion: Collaborating with DEDISA helps divert organic waste from landfills, supporting circular economy principles and reducing landfill-related emissions.

Social and Systemic Impact

• Local Job Creation: Local manufacturing jobs for kiln fabrication; Vineyard-side labor opportunities for burn management and compost handling.
• Capacity Building: The project builds local technical capacity through training workshops.
• Network Expansion: Through enforced membership in Porto Protocol, new farms join a global network, benefiting from shared expertise and collective bargaining power.
• Replicability& benchmark: The model can be scaled across Greece and replicated in other wine-producing regions, serving as a benchmark to the wine industry.

About the solver

Porto Protocol is a global, member-driven platform founded by Taylor’s Port that unites over 250 wineries, researchers, and sustainability experts across 30+ countries to climate action in the wine industry. Through its online hub (www.portoprotocol.com), it facilitates knowledge sharing, collaborative pilots, capacity building, and advocacy for circular economy and low carbon solutions. For this initiative, Porto Protocol will:
• Facilitate farmer enrollment and eligibility screening
• Organize workshops and training sessions, acting as the central hub for stakeholder coordination.
• Facilitate international knowledge exchange and scalability planning.
• Disseminate findings through its global network. (eg through the resource library: https://www.portoprotocol.com/solution/applications-of-biochar-in-viticulture/ or the Climate talks: https://www.portoprotocol.com/solution/biochar-vineyards-mimi-casteel-claudia-kammann-hans-peter-schmidt-and-antoine-lespes/

CHARR (Carbon Harmonization and Accounting for Reductions and Removals) is a climate technology partner specializing in carbon footprinting and MRV. The CHARR team has:
• Conducted detailed carbon assessments for wine farms, wineries, and distribution channels (including wine bottle-level footprinting).
• Facilitated biochar burns and training at three wine farms in South Africa over the past four years.
• Worked with biochar producers in Napa Valley, California.
• Developed an ISO 14064-compliant carbon footprinting app for a major wine distributor in South Africa.
• Partnership with Wilson Biochar - wilsonbiochar.com, https://www.amazon.co.uk/Biochar-Handbook-Practical-Bioactivated-Charcoal/dp/1645022307
• Partnership with Wilson Biochar - https://pacificbiochar.com/oasis-vineyard-field-trial-with-biochar-and-compost-_-6th-harvest-report/ , https://napagreen.org/wp-content/uploads/2021/01/Monterey-Pacific-Vineyard-Management_Biochar-Trial.pdf , https://pacificbiochar.com/wp-content/uploads/Oasis-Vineyard-Trial_-5th-harvest_-Final-Draft_12.12.2023.pdf
• https://www.mycharr.earth/
• https://www.mycharr.earth/ , https://www.fs.usda.gov/rm/pubs_series/rmrs/gtr/rmrs_gtr439.pdf
• https://www.youtube.com/watch?v=5TVNTjWoBwA , https://www.youtube.com/watch?v=wpuk_xRI6P0
• Partnership with Wilson Biochar - https://wilsonbiochar.com/
In this initiative, CHARR will provide the technical tools (Ring of Fire kilns, training, and MRV software) necessary to generate and verify carbon removals, ensuring that all data is robust and independently verified for guidance on future funding opportunities to scale this model.

DEDISA (the Intermunicipal Solid Waste Management Company of Crete) plays a pivotal role through its “Φυτοχώματα” program. By processing urban and agricultural organic waste into compost, DEDISA creates an ideal complement to on-farm biochar. This proposal leverages their expertise to secure a local, renewable feedstock for blending with biochar, thereby elevating the value of the final soil amendment product.

Indicative budget/Phases