Biochar can be used pretty much everywhere that consists of soil and plants. It has a variety of ways to be implemented in our forests, landscapes, farms and gardens.
Is the soil fertile or is the soil depleted?
If the soil is depleted, eroded and lacks life you would definitely want to add organic matter/mulch and mix it with the biochar. This will start to build up the biology. Biochar should be blended with mulch and water, which will create a stable home for the microbes. Watering your newly biochared soil mix the first few days is also a crucial step to helping it start up its biological activity.