Making Biochar to Improve Soil

By making biochar from brush and other hard to compost organic material, you can improve soil — it enhances nutrient availability and also enables soil to retain nutrients longer.



making biochar - improve soil
One method of making biochar: pile up woody debris in a shallow pit in a garden bed; burn the brush until the smoke thins; damp down the fire with a one-inch soil covering; let the brush smolder until it is charred; put the fire out. The leftover charcoal will improve soil by improving nutrient availability and retention.
ILLUSTRATION: ELAYNE SEARS
Burn barrel
You can also make biochar in a burn barrel. Just watch the smoke. When it thins, pop on a lid to slow combustion.
ELAYNE SEARS
biochar3
Smothering the fire with soil when it was partially burned resulted in lots of charred pieces. When the trench is refilled, the biochar will rest 10 to 12 inches below the soil's surface.
BARBARA PLEASANT
biochar1
The problem area was once cultivated organic garden, but it's been in weeds and brambles for 5 years. I'll use a thick mulch and winter squash to weaken the unwanted ones for a season before digging them out by hand.
BARBARA PLEASANT
biochar2
One of two winter squash beds on the slope is an experimental biochar bed. After digging out a 10-inch deep 2x6-foot wide trench, we filled it with seed-bearing weeds, brambles, and other materials we didn't want in the compost.
BARBARA PLEASANT
Campfire
Biochar can be collected from half burned campfire wood.
ELAYNE SEARS
biochar4
We had enough stuff to do a second smolder, so the winter squash in the smoking bed will grow atop two layers of biochar – plus the compost I'll add as I prepare for planting. A few feet away, a second bed will get an equal share of compost, but no biochar. I'll report back in the fall on how they do.
BARBARA PLEASANT











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