Generally a natural fertilizer that over a period of time will release its nutrients. Always a good practice to use.
A fertilizer that is made by coating the particles with a wax, clay, or other material to provide a predictable, slow release of the encapsulated nutrients.
Long-lasting fertilizer that is water insoluble and therefore releases its nutrients gradually as a function of soil temperature, moisture, and related microbial activity. Typically granular, it may be organic or synthetic. 
The property of a fertilizer that allows it to release it nutrients to plants over time.
The property of a fertilizer that allows it to release it nutrients to plants over time.
Fertilizer that comes in pellets and is slowly released based largely on microbes which are more or less active based on soil temperatures.