Fertilizers can be [[man-made]] from [[chemical]] or [[organic]] sources, or natural products (typically [[compost]]ed) added to the soil. Perhaps the most familiar of the "natural" fertilizers is animal [[manure]].
Fertilizers can be [[man-made]] from [[chemical]] or [[organic]] sources, or natural products (typically [[compost]]ed) added to the soil. Perhaps the most familiar of the "natural" fertilizers is animal [[manure]].