Seaweed NPK fertilizer granular, contains NPK, organic fertilizer and natural mineral. A high-efficient soil conditioner Rich-harvest(Seaweed npkFertilizer Granular)The seaweed compound fertilizer can ... matter: 20% + Ca, Mg, Zn, Fe, etc.2.3 NPK: 12-8-15 with seaweed: 10% + organic matter: 20% + Ca, Mg, ... Zn, Fe, etc.2.4 NPK: 8-8-8 with seaweed: ...