Fertilisers and soil amendments are a wide array of materials added to soils to improve plant growth. They can be organic, such as bone meal, or inorganic, such as 10-10-10 fertiliser. Some must be purchased, while others are free for the taking from your landscape. Many are dual purpose—they serve as both fertilisers and soil amendments.
TRAUNFELD, J. NIBALI, E. (2009): Soil Amendments and Fertilizers. Fertilizing Guidelines Included by Plant Group. ELLICOT CITY: Home and Garden Information Center URL [Accessed: 09.07.2019]