I am a believer in biochar benefits. We all need to help develop the proofs of what we are preaching.
Question: For the Ghana / Malawi report (by WarmHeart, right?), is the 50:50 by volume or by weight? I suspect that it is by volume.
And what would that proportion be if expressed the second way? 50:50 by volume becomes what by weight? Or the other way around? Weight is weight and does not change, but volume also subject to particle size, soft vs hard
wood vs agro-refuse.
Do we (as a community) have reasonable answers about this variation in the mixing formulae?
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Thanks for leading the biochar discussion at ETHOS, Paul. As you discuss biochar production in TLUDs you might remember that it doesn't take that much biochar when combined with manure and used strategically to make a big difference. You
have probably seen the reports, video and pictures from Ghana and Malawi where 70 kg of a 50:50 blend of biochar and manure, which a smallholder can make for practically nothing, performs better than 25 kg of synthetic fertilizer that requires cash.