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Carbonized rice husk contains 0.54% nitrogen, 66 mg/kg available phosphorus and 0.66% available potassium. It is nutritious and charred at high temperature without pathogens. The pH value is 6.5-7.7. If there is no washing before use, the K2CO3 formed by carbonization will raise the pH value to above 9, so it is better to wash before use.
