Article on the stunning environmental benefits of agrichar.

The exceptional properties of charcoal in soil were first noticed in the Amazon where there are large areas of what is called "terra preta" or Amazonian dark earths. These dark earths can be several feet deep and contain up to nine percent carbon, as compared with nearby soils that have only about half of one percent. In one of the most fascinating aspects of this story, the terra preta soils turn out to have been deliberately created by a lost Amazonian civilization. Some of the areas have been dated going back to more than 7,000 years, and they are still highly fertile.

Field trials and experiments in pots show impressive yield gains in charcoal-amended soils, but so far researchers don't completely understand why. One question is whether the effect is primarily chemical and physical or primarily biological. Charcoal is a highly porous material that is very good at holding nutrients like nitrogen and phosphorus and making them available to plant roots. It also aerates soil and helps it retain water.