Petro 558 pH- is an organo-mineral fertilizer containing fine raw materials naturally rich in micro-nutrients (Iron, Zinc, Copper, etc.) and in important nutriments such as Potassium and Calcium. Petro 558 pH- is ideal for alkaline pH soils, as it unlocks numerous nutrients present in insoluble forms by increasing their bio-availability and assimilability. The product nourishes plants in a balanced and constant way over time thanks to the fine raw materials, carefully selected to determine a planned nutrient release. The presence of calcium in Petro 558 pH-, made even more effective by technology RyZea, promotes the soil structuring, increases the root habitability and reduces the onset of nutritional deficiencies.