Rock Phosphate

Rock Phosphate (Ca₃(PO₄)₂, 28-32% P₂O₅) is a naturally mined sedimentary mineral and the primary raw material for all manufactured phosphate fertilizers. In its ground form, it serves as a slow-release phosphorus source approved for organic agriculture, providing P nutrition over 2-5 years on acid soils. Dongkwang Poland supplies both reactive rock phosphate (for direct agricultural use) and beneficiated rock phosphate (for phosphoric acid and fertilizer production) from North African and Middle Eastern deposits, the world’s most significant phosphate reserves.

Rock phosphate dissolves in acid soil conditions (pH <6.5), releasing phosphate ions (H₂PO₄⁻) for plant uptake. Dissolution rate depends on soil pH, organic acid production by soil microorganisms, and particle size. Finely ground reactive rock phosphate from sedimentary deposits (Morocco, Tunisia) dissolves faster than igneous rock phosphates. On neutral-to-alkaline soils (pH >7), dissolution is too slow for adequate P supply — manufactured fertilizers (MAP, DAP, TSP) are recommended instead.

Ideal For

Store in dry conditions. Non-hazardous, non-reactive. Extremely stable — shelf life effectively unlimited. Dusty during handling — use dust mask. No special storage requirements beyond protection from rain. Bulk storage in open bays or covered silos.