Zeiz UP is a highly purified phosphate fertiliser with pronounced acidifying properties, formulated for rapid and complete solubility. It is particularly recommended during early vegetative stages to support robust root and shoot development, especially in alkaline and calcareous soils where phosphorus availability is often restricted. Owing to its low pH, Zeiz UP reduces bicarbonate concentrations in irrigation water, decreasing solution pH and enhancing phosphorus uptake during fertigation.