Do all fertilizers contain metals? Where do they come from?
A. Yes, there are varying levels of metals in all fertilizers (see the WSDA Database for specific metals content data on individual fertilizers). Metals are naturally occurring elements that are typically found in very low levels in almost everything around us. Of course, not all metals are in everything, but the metals found in many fertilizers originate in the natural raw materials (often mined materials such as phosphate rock) used in manufacturing fertilizers. So, just because there are metals in a fertilizer product does not necessarily indicate that the fertilizer uses a waste as an ingredient. The metals in your fertilizer could be from entirely natural raw materials.
