Single super phosphate SSP 18% Triferto Fertilizers Composition EG-MESTSTOF: Superfosfaat : 18% P2O5 fosforzuuranhydride oplosbaar in water en neutraal ammoniumcitraat (P2O5), 16,2 % fosforzuuranhydride wateroplosbaar (P2O5) 27,5% zwaveltrioxide wateroplosbaar (SO3), 29% calciumoxide (CaO). Plants need the phosphorus element as building material for the formation of certain proteins and other organic substances. This element also plays a role in various physiological processes in the plant, such as assimilation and respiration. That is why a lack of phosphorus has a very negative effect on the yield of crops. The amount of phosphorus fertilization depends on the amount of plant available phosphorus in the soil and the requirement of the crop.