... all kinds of fertilizers such as NPK compound fertilizer, composts, Nitrogenou fertilizer(ammonium sulphate, ammo npk 17-17-17 ... efficiency or sustainability. General specification of Gramalet Formula Flexible Fertilizer :1. Primary Nutrients NPKEach tablet contain NPK such ... FertilizersAs a Slow release fertilizers, Gramalet formula flexible fertilizer can be a more efficient source of nutrients than ...