All Hyfer Solid Fertilizers are organically coated for “sustained release” of its NPK content. This allows the fertilizers to gradually dispense its NPK slowly to the plants as needed. The results are better absorption of NPK nutrients, improves production, less wastage of fertilizer inputs and lesser cost in the long run for farmers. The special coating also has a insect-repelling action against certain insects. So all our solid fertilzers actually cost much less because of this simultaneous 2-in-1 action as both for plant nutrition and protection.