Perk 4-0-14 will not over stimulate growth. The 10% slow release iron provides long term colour without excessive growth. The methylene urea provides extra longevity and gives the product a low salt index. The combination of manganese, iron and potassium make this an ideal autumn and winter turf hardening formulation.
 
Impact Perk 4-0-14 is a zeolite based homogenous fertiliser, with a high potassium formulation with added manganese. It is ideal for sand based constructions and added 10% phased release iron provides up to 12 weeks of green up. Impact Perk 4-0-14 should be applied at 20-40 g/m², the 20 kg bag will cover 500-1,000 m² and it can be used all year round.