FERTIFIELD NPK 4-8-16 is an organo-mineral NPK fertiliser obtained through the reaction of raw materials, formulated to enhance the high organic nitrogen content and improve the assimilability of phosphates through the action of complexing organic components. The organic nitrogen present gradually mineralises over 30-45 days after application, ensuring a gradual release. The addition of organic matter increases the microbial biomass in the soil, improving the availability of microelements, particularly iron, and promoting better phosphate absorption. The presence of potassium contributes to the regular development of the fruit and improves its post harvest shelf life, while the increase in soil enzyme activity stimulates root growth. The balance between organic and mineral components reduces nitrate leaching losses, promotes uniform plant growth and increases resistance to plant diseases and environmental stresses, both hydric and thermal. FERTIFIELD NPK 4-8-16 is particularly suitable for autumn and spring basal fertilisation, even in grassed vineyards and tree crops. The formulation is also recommended for base and maintenance treatments in soils deficient in phosphorus and potassium, in orchards, vineyards and citrus trees, with or without grass cover, and is also widely used in high-value herbaceous cultures such as potatoes, tomatoes, sugar beet, melons and tobacco.