Rock Phosphate(RPP) is used as a base fertilizer. It is a type of phosphorus fertilizer on acid podzolic, gray wooded, and bog soils and on leached chernozems and red soils. This organic fertilizer contains 28% to 32% P2O5. Specification 1)P2O5:28-32% 2)CaO45-52% 3)mesh size:100-6000mesh 4)Color:Red/Yellow/Grey/Brown 5)Magnesium Oxide (MgO) : 0.62 % max. 6)Aluminum ( AL2O3 ) : 0.40 % max. 7)Iron (Fe2O3) : 1.48 % max. 8)Fluoride (F) : 3.10 % max. Packing:50kg/1000kg