Roots Organics Super Phos Rock Bat Guano 1-14-0, 55 lbsRoots Organics Super Phos Rock is incredibly high in phosphorus and calcium and is extracted from select caves when the quality is at its highest. Our most concentrated organic phosphorus source, Roots Organics Super Phos Rock packs 20% available calcium. This one two punch of phosphorus and calcium simultaneously maximizes heft and quality, bringing flavors to the forefront while improving yields like a targeted flower hardener. With an NPK of 1 14 0