Personally I think rice husk biochar (often alkaline) could be used on acidic Acrisols (upland areas) , sandy soils, basaltic soils in high-terraced areas (also acidic), acid suphate soils (coastal areas; under mangroves) ?
sandy soil in my study and other around the world. Some paper showed that biochar had the most effective in sandy soil for amending
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Nice Q and fruitful Contribution
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