There are quite a few trials going on and Duchy College are doing a 2 year trial with Carbon Gold's biochar mixes. There is a report from a field...
You're quite right that there is more calcium that potassium in wood ash. Here's a little chart that compares different types of wood ash[ATTACH]
Your Grandad's 'ash mountain' is mostly Potassium. Biochar is Carbon. Potash is a potassium fertiliser that makes hydrangeas a better blue colour...
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GroChar itself is a pH modulator, generally reducing the tendency towards acidity and having a mildly alkalising effect ( a lot depends on the...
GroChar comes in various sizes, the smaller packs in garden centres are £6.99 for a Kilo of pure biochar with added mycorrhizal fungi (Rootgrow),...
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