Good for your soil.
Considered for tomorrow.

Some field studies found no benefit, or lower yields, at higher rates (for example 11–22 t/ha on a poor acidic soil). Start lower or try a trial plot first.

Biochar is not a substitute for fertilizer, and there is not yet enough field data for general rate recommendations by soil and crop (International Biochar Initiative, 2010). A 2017 meta-analysis found yield benefits on average in tropical soils, with no average effect in temperate soils (Jeffery et al., Environmental Research Letters 12 053001). This planner sizes a quantity only; it does not predict yield.