SkyCarbon Biochar

Skycarbon Biochar is obtained as co-product of the gasification process which turns local green waste into electricity and heat. It is a product that enables carbon drawdown while producing agronomic value. Please see our biochar and co-composting pages for more info.

1 kg bags

Maximum impact 40kg of CO2e

Six Pack of 1 kg bags

Max. impact 240kg of CO2e

Bag of biochar with x1

We will be opening the purchase option in the fall of 2019.

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Cardboard box with 6 1kg bags of biochar

SkyCarbon Tar-Free Geoconductor Walnut Shell IBI Certified Biochar

FEEDSTOCK TYPEUnprocessed Feedstock
Moisture (at time of analysis)13%
Organic Carbon (Corg)67.8%
Total Ash15.4%
Total N0.46%
Electrical Conductivity7.180 dS/m
Liming13.9% CaCO3
Particle Size Distribution
< 0.5 mm10.3%
0.5 – 1 mm8.7%
1 – 2 mm18.5%
2 – 4 mm34.4%
4 – 8 mm25.2%
8 – 16 mm3.0%
Germination Inhibition AssayPASS
Polycyclic Aromatic Hydrocarbons (PAHs), total (sum of 16 US EPA PAHs)67.46 mg/kg – PASS
Polycyclic Aromatic Hydrocarbons (PAHs), B(a)P-TEEQ basis 0 mg/kg – PASS
Dioxin/Furan (PCDD/Fs), WHO-TEQ basis0 mg/kg – PASS
Polychlorinated Biphenyls (PCBs), total (sum of 7 US EPA PCBs)0 mg/kg – PASS
Arsenic0.6 mg/kg – PASS
CadmiumND – PASS
Chromium 1.4 mg/kg – PASS
CobaltND – PASS
Copper46.3 mg/kg – PASS
Lead0.3 mg/kg – PASS
MercuryND – PASS
MolybdenumND – PASS
Nickel1.6 mg/kg – PASS
SeleniumND – PASS
Zinc4.1 mg/kg – PASS
Boron89.6 mg/kg – DECLARATION
Chlorine5341 mg/kg – DECLARATION
Iron341 mg/kg – DECLARATION
Manganese41 mg/kg – DECLARATION

Composting Benefits:

  • Biochar stimulates higher temperatures, resulting in more rapid and thorough composting.
  • Higher temperatures also kill pathogens and weed seeds.
  • Compost odors are reduced.
  • Harmful emissions from compost such as methane, nitrous oxide, and ammonia are significantly reduced.
  • Fixed-Nitrogen nutrients normally lost as compost leachate and as nitrous oxide emissions are captured and made available to plants.

Benefits to Soil and Plants:

  • Co-composted biochar increases the soil’s water holding capacity.
  • Soil and plant usage of water becomes more efficient.
  • Soil texture is improved: bulk density, friability, water permeability, porosity, and moisture wicking are all significantly improved.
  • The population and activity of rhizobacteria that produce plant-growth stimulating exogenous hormones is increased.
  • Soil fungal population and activity are increased; soil fungi mediate the availability of phosphorus.
  • Free-living nitrogen-fixing bacterial populations and activity are increased. These bacteria produce nitrates, and minimize the need for inputs of nitrogen fertilizer.
  • Fertilizer utilization efficiency is increased; if fertilizer is still needed, much less is needed.

In summary:

Expect rapid and vigorous plant growth with no added fertilizer in the first growing season, and minimal inputs thereafter. Expect reduced need for water.

Instructions for use

Biochar is very adsorptive, and should not be added directly to soil without some sort of pre-treatment to enable it to immediately benefit soil fertility. Do not add dry biochar directly to soil, otherwise it may suppress plant growth and drive out the worm population until it has been assimilated into the soil over the course of several seasons.

The best way to prepare biochar for incorporation into the soil is co-composting. Sending the biochar through a hot aerobic compost process results in many benefits to the compost as well as the biochar. The biochar is not consumed in the composting process; rather, it enhances the composting process while the composting process coats the biochar in a functional coating that imparts the many benefits that biochar is known for.

Here is the recommended procedure:

  1. Thoroughly wet the biochar in water until all of it is damp.
  2. Temper with a quart of finished compost to the mixture as a compost starter if possible.
  3. Add tempered biochar to compostable materials.
  4. The ideal ratio is 10% biochar, but 5%-30% also work quite well.
  5. Turn your compost at least weekly.
  6. Compost the mixture aerobically until the temperatures drop

Once the compost is mature, either to-dress the soil with the compost and cover with mulch, or mix into the top few inches of soil using a cultivator and cover with mulch.

Funding obtained via the resale of these products will be used exclusively to seed and support the creation of Local Carbon Network Projects worldwide.