Biochar: Miracle or Gimmick?
...a lush vegetable garden. One such substance is biochar, a kind of charcoal used as a soil amendment. The University of Minnesota Extension service is in the midst of a four year study to test the use of biochar in vegetable gardens. Preliminary results (which you can read here) show benefit for some crops such as kale, but a decrease in growth for others such as asparagus. The more we learn about biochar, the more we need to learn. From an overall...