What is Biochar?
Biochar Use in Gardens
Biochar as a soil amendment enhances plant growth and reduces need for water and fertilizer. This is because more moisture and nutrients remain in the soil and don’t leach into the groundwater. Scientists believe that soil improved by biochar is more efficient, retaining critical nutrients such as magnesium, calcium, phosphorus, and nitrogen. Additionally, nutrients present in the soil are more available to plants, making good soil even better. You can create biochar in your own garden by burning brush, wood shavings, dry weeds, and other garden debris in a trench. Light a hot fire so the oxygen supply is quickly reduced, and then let the fire burn down. Initially, the smoke from the fire should be white as water vapor is released, gradually turning yellow as resins and other materials are burned. When the smoke is thin and grayish blue in color, cover the burning material with about an inch (2.5 cm.) of excavated garden soil. Allow the material to smolder until it creates chunks of charcoal, then extinguish the remaining fire with water. To use biochar fertilizer, dig the chunks into your soil or mix them into your compost pile. Although charcoal briquettes from a barbecue may seem like a good source of biochar, the charcoal usually includes solvents and paraffin that may be harmful in the garden.
