FERTIFIELD NPK 18-7-5 is an organo-mineral NPK fertiliser obtained through a reaction between mineral matrices and organic-protein components. The formulation process is designed to maximise the protection of mineral elements, particularly phosphorus (P) and potassium (K), reducing losses caused by insolubilisation. The formulation includes: organic nitrogen with slow mineralisation, a significant amount of ureic nitrogen, a balanced ratio of P and K, and a highly selected fraction of organic matter. The presence of organic nitrogen of protein origin ensures a gradual and constant release of the element, promoting regular vegetative development and limiting losses due to leaching. The high quality of the organic matrices used gives the product excellent agronomic efficiency, resulting in a reduction in fertiliser units compared to traditional mineral fertilisers, with a consequent optimisation of costs and a lower environmental impact. The fertiliser is suitable for autumn and late winter fertilisation of tree crops. It is also suitable for fertilising horticultural crop.