Isobutylidene Diurea

An inorganic, controlled release fertiliser, supplying 38% nitrogen. It is a fertiliser created from the combination of urea and isobutraldehyde. It is slow release, typically being over a period of 3-months. Like many of these types of fertiliser, it creates a neutral reaction on a turf surface and overuse encourages annual meadow grass, weeds and earthworm activity. It might also be spelt with a space, i.e. Isobutylidenediurea, and is usually just referred to by its acronym of IBDU.