Abstract To mobilize sparingly available phosphorus (P) in the rhizosphere. many plant species secrete malate to release P sorbed onto (hydr)oxides of aluminum and iron (Fe). In the presence of Fe. malate can provoke Fe over-accumulation in the root apoplast. https://www.kerrenneur.com/product-category/food-servicecommercial-kitchen-equipmentfood-preparation-equipmentother-commercial-food-prep/