“Biochar’s high carbon content and porous composition helps soil to retain water, nutrients, protect soil microbes, and ultimately increase crop yields while growing healthier, more productive, disease-resistant plants. All the while helping combat global climate change by sequestering and stabilizing rich organic carbon in your soil,” explained Michael Wittman.
Biochar is a charcoal soil amendment that has been made in Asia, often from bamboo, for thousands of years to increase plant productivity. Charcoal been used for years as an air and water filter. “A natural amendment,” said Michael Wittman, “biochar is a microscopic honeycomb that holds beneficial soil bacteria, moisture, and nutrients.” It can improve soil structure, reduce erosion, and do its job in the soil for hundreds of years. Like a fire in the forest leaves charred wood to enrich the forest floor, biochar enriches the soil by retaining moisture and nutrients. Bamboo biochar has ten times more surface area, a fixed nutrient ratio, more water retention, and absorbs more soluble nutrients than other biochar derived from wood, straw, or manure. Delicate beneficial fungi are difficult to keep in the soil, but biochar can build fungal qualities in all types of soil.
Touring Michael Wittman’s Thousand Oaks garden, Organic Garden Club members learned how to make biochar from wood burning in a small kiln. To keep gophers, squirrels, birds, and bunnies out of the veggies, Michael built a wire house under and around his raised bed garden and hung his tomatoes from the roof. He grows strawberries and herbs in satellite dishes for easy reach with a fire pit cover to keep out the critters. To harvest the rain water, he has two large 350 gallon tanks connected to the rain gutters from his roof with a hose at the side of the tanks to water the garden. He keeps his compost in a wire house, where he mixes it with biochar to provide a home for the growing bacteria and fungi.
The process of making biochar pulls carbon out of the atmosphere and returns it to enrich the soil and grow plants that breathe in carbon dioxide and breathe out oxygen. With biochar you can as Michael said, “Leave your carbon footprint in the garden…”