Division 1 An inorganic macronutrient fertiliser shall be aimed at providing plants or mushrooms with one or more of the following macronutrients:
United Kingdom
- (a)
primary macronutrients: nitrogen (N), phosphorus (P) or potassium (K),
- (b)
secondary macronutrients: calcium (Ca), magnesium (Mg), sodium (Na) or sulphur (S).