Sonoma Compost Company
  Regional Compost Program
  School Garden Program
  Municipal Consulting
  Contact Us
Our Products
  Products / Pricing
Why Use Sonoma Compost
  Soil Improvement
  Environmental Benefits
  Yes, We're Organic!
Sonoma Compost in Use
  Backyard Gardening
  Erosion Control
Compost Forum
  Ask the Experts
  Helpful Hints

News Department
  Research Projects


Contact Info

NOTE: On Order

What Is Biochar?
Biochar (or agrichar) is one of the products created when high-carbon materials such as wood scraps and the woody, undecomposed fraction of yard debris are gasified under low oxygen conditions (pyrolysis). The process produces both syngas for green energy and biochar to be used as a soil amendment.

The use of biochar goes back thousands of years, deliberately so or not. In the Amazon Basin today, there are rich and fertile, black soils (Terra Petra) that are the result of carbon left behind from the fires and cooking of indigenous people. These soils have held their fertility over thousands of years. Sonoma Biochar allows you to reactivate this ancient soil-building technique. Today this biochar is produced while creating green, renewable energy.

Join Us On Facebook
Facebook_Logo Join a discussion, see what others have to say. We'd love to hear from you. (Click Facebook logo)

How Is It Used?
Biochar Sample

1 Cubic foot of Sonoma Biochar is applied to the surface of 48 square feet of soil. Cover the Biochar with a high quality compost and water well (we recommend 4 cubic feet of compost). Move the biochar and compost back and forth to make sure it all gets moist. This step will allow the water running through the biochar-compost mix to form a compost tea that can be absorbed by the Biochar, thereby 'charging' it. Next, work the compost and biochar into the top 8-12 inches of soil and water well. Allow the soil to come to equilibrium for a few days, continuing to irrigate regularly. Next, hold off on watering until the soil feels just moist, not wet or dry. You are now ready to plant.

Biochar is applied only once, but the results will last forever as long as you keep your soil biologically active. Annual applications of compost, mulch, cover crop, etc. will recharge the biochar over the years.

Sonoma Biochar
Quantity Price
1 Cubic foot bag $ 17.50
Cubic yard (bulk) $240.00

We do not ship cubic foot bags, pick up at retail yard only. Please call ahead at 707 664 9113 for availability.

What Are the Reported Benefits of Biochar?
Biochar, a very porous medium, can be seen as a hotel for microorganisms. The compost provides the food that the microbes need to proliferate leading to increased microbial diversity and populations. In addition, biochar has high cation exchange capacity (a negative charge) and as a result will hold on to positively charged nutrients, conserving nutrients. Biochar also has a high water holding capacity and thus reduces irrigation needs.

In addition, since biochar lasts for thousands of years in the soil, carbon that plants have fixed from the atmosphere is now removed from the carbon cycle and is banked in the soil. This process is called carbon sequestration. Carbon sequestration is an effective tool in reversing global warming.

For more information:
Email us at: Sonoma Biochar
For further reading see: US Biochar Initiative
Or locally: Sonoma Biochar Initiative

To Top

Sonoma Compost (West Marin Compost)- 5575 Nicasio Valley Rd, Nicasio, CA 94946
Phone: 707.664.9113; office@sonomacompost.com
Hours: Monday - Saturday 7 a.m. to 3 p.m. Sundays - Closed