Linked from
The 15 pages that link to Biochar, each with the reason it gives.
Soil carbonRelated: Its relatively persistent carbon can add to soil stocks when applied.
Soil carbon sequestrationRelated: Its relatively persistent carbon can add to soil carbon stocks.
Soil amendmentRelated: Its porous structure can influence soil water, nutrients, and carbon storage.
StrawRelated: Straw can be converted into biochar rather than burned or left to decompose.
Betula pendulaRelated: Birch wood can serve as feedstock for biochar production.