Controlled Release Fertiliser

A manufactured fertiliser which has a coating material applied to reduce the rate at which the enclosed nutrient is released. The nutrients are therefore artificially controlled in their release. This term may sometimes just be referred to as just Controlled Release.
The release of nutrients is over an extended period of time, for example 3-months or greater, with an example being ICL Sierrablen. Use of this type of fertiliser may only require a single application during early spring and then a further addition of a small liquid feed during the latter part of the growing season. Some controlled release fertilisers may also encourage annual meadow grass and disease during slower growth periods where nutrients are released into surface layer of a sward.