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.

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.