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Oxygen (65% ) Carbon (18% ) Hydrogen (10% ) Nitrogen (3% ) Calcium (1.5% ) Phosphorus (1.0% ) Potassium (0.35% ) Sulphur (0.25% ) Sodium (0.15% ) Magnesium (0.05% ) Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70% ) Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)