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If plant material is dried and burnt in a crucible, the residue would contain
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Oxides and carbonates of about ten elements
If dried plant parts are heated in silica crucible at 600°C all organic substances vaporize and the remaining plant ash contains only inorganic substances or essential mineral elements. The essential elements are C, H. O, N, P, K, S, Mg, Ca, Fe, Mo, Mn, Ni, Zn, B, Cl, Cu.
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