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Turning Coffee Waste into Organic Fertilizer – Natural Composting at HuyEco Farm

At HuyEco Farm, coffee husks are composted with cow manure and Trichoderma fungi to create nutrient-rich organic fertilizer—supporting soil regeneration and sustainable, closed-loop farming.
Turning Coffee Waste into Organic Fertilizer – Natural Composting at HuyEco Farm

Bài viết này cũng có phiên bản tiếng Việt: Biến Vỏ Cà Phê Thành Phân Bón Hữu Cơ – Compost Tự Nhiên Từ HuyEco Farm.

Turning Coffee Waste into Sustainable Fertilizer

At the beginning of 2025, we are wrapping up the coffee harvest at HuyEco Farm. This year, in addition to tending to our own coffee trees, I decided to purchase coffee cherries from neighboring farms.

The goal is twofold:
✅ Support local farmers in transitioning to low-chemical or chemical-free cultivation.
✅ Supplement supply for our partner cafés while improving overall coffee quality.

But what about waste management? Instead of discarding coffee husks, I’m turning them into organic fertilizer, helping to close the loop in sustainable coffee farming.
 

Farmer sitting on a compost pile at HuyEco Farm—checking moisture and decomposition progress of coffee husks and cow manure
A farmer sits atop a compost pile at HuyEco Farm, inspecting the moisture level and breakdown of organic materials. A grounded moment that reflects hands-on commitment to regenerative farming.
Washing fresh coffee cherries at HuyEco Farm—coffee is a sweet fruit, and its husks can be composted into organic fertilizer.
Washing coffee cherries at HuyEco Farm. As a sweet fruit, coffee yields husks that can be transformed into compost—closing the loop in sustainable farming.

Composting Process – How We Transform Coffee Husks

To kickstart composting, I ordered:

🚛 2 truckloads (~10m³) of fresh coffee husks
🌿 20 sacks of fully decomposed dry cow manure
🦠 Trichoderma fungi (spore density: 10⁹) for compost activation

Step-by-Step Method:

1️⃣ Prepare the compost pile – Layer husks and manure evenly.
2️⃣ Hydrate & mix –

  • Dry cow manure absorbs more water, requiring thorough soaking.
  • Fresh coffee husks retain moisture, so water is applied gently.
    3️⃣ Introduce microbes – Mix 1 kg of Trichoderma fungi into 300 liters of water and spray over the compost pile.
    4️⃣ Cover with a tarp – Leave the bottom exposed for air circulation, as Trichoderma is an aerobic fungus.

📅 Next Steps:
✅ In early February, I’ll turn the compost pile to aerate and speed up decomposition.
✅ After repeating the process a few times, the compost should be ready for application within a month.

Whole coffee cherries drying on raised beds at HuyEco Farm—preserving the sweet outer layer for both flavor and composting.
Whole coffee cherries drying on raised racks at HuyEco Farm using the natural process. The sweet outer skin enhances flavor and can later be composted into organic fertilizer—supporting a closed-loop farming system.
Harvesting ripe coffee cherries directly from the tree at HuyEco Farm—selecting only the red ones to ensure quality and preserve the sweet husk for composting.
Harvesting ripe coffee cherries at HuyEco Farm. Farmers carefully pick red cherries by hand to ensure bean quality while preserving the sweet outer layer—later composted into organic fertilizer as part of a closed-loop farming system.

Challenges & Scaling Up

This batch is just an experiment—let’s look at the numbers:

  • Ratio: 4m³ of coffee husks ≈ 1 ton of compost
  • Target: 1,000 coffee trees
  • Available Compost: 10m³ of husks + 20 sacks of manure ≈ 2.5 tons
  • Ideal annual need: 100kg of compost per tree
  • Reality: This batch only covers 100 trees for one cycle 😆

🔥 Scaling up requires:
➡ 100m³ of coffee husks
➡ Unlimited cow manure (or expanded compost alternatives)

Mixing Trichoderma fungi into a 300-liter tank at HuyEco Farm—preparing microbial solution for compost pile irrigation
Mixing Trichoderma fungi into a 300-liter tank at HuyEco Farm. This microbial solution will be sprayed over the compost pile of coffee husks and cow manure, accelerating decomposition and enriching the final organic fertilizer—a key step in sustainable composting.

Cost Estimates

Here’s the estimated budget breakdown for scaling compost production:

 

Item

Quantity

Unit Cost

Total Cost

Coffee husk trucks (5m³ per truck)

20 trucks (~25 tons)

500,000 VND/truck

10,000,000 VND

Trichoderma fungi (1kg per 5m³)

20 kg

65,000 VND/kg

1,300,000 VND

Cow manure (500 sacks or 1 ton of expanded compost)

500 sacks

-

15,000,000 VND

Labor (mixing & handling, 20 workers)

20 workers

300,000 VND/worker

6,000,000 VND

Total Cost

-

-

32,300,000 VND (~$1,275 USD)

This cost estimate provides a clearer picture of what’s needed to scale sustainable composting at HuyEco Farm.

Final Thoughts & Future Steps

✅ This experiment sets the foundation for a larger-scale composting system at HuyEco.
✅ Coffee husks are an untapped resource—turning them into fertilizer aligns with our goal of closed-loop farming.
✅ The next phase: Expanding production, refining cost efficiency, and integrating compost tea applications.

Sustainability is about continuous learning and adaptation—this project brings us one step closer to self-sufficient farming at HuyEco. 🚀

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All articles, images and videos in this article are copyrighted by HuyEcovn, please do not use for other purposes.
In case you want to use the materials for non-profit community purposes, please contact the author at email address: huyeco1125@gmail.com
Sincerely
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