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The ash obtained from the burning of wood can be used as a natural fertilizer for the soil in the garden, as it contains a lot of nutrients that can supplement vitamin and mineral deficiencies. Ash is an excellent source of calcium, potassium, phosphorus, and because it is alkaline, it can be used to balance the acidity level in the soil. Be careful, though! Not every ash is a good fertilizer! The scraps of painted wood that you have left after replacing your old fence or other wood products that have been varnished and painted can be burned, but the resulting ash is not good for the soil because it contains chemicals that can affect plant growth. Careful! Even the ash from burning barbecue coals can have harmful effects on plants, so experts say you shouldn't throw it haphazardly on the ground.