DERMAFERT NPK 6-7-13 BIO is an organo-mineral NPK fertiliser with a low content of chlorine, obtained through a reaction between mineral matrices and organic protein components. The product contains: organic nitrogen from scleroprotein origin with natural slow release, capable of ensuring a constant supply during the entire cropping cycle; assimilable phosphorous protected by organic matter in order to avoid insolubilisation processes; potassium from sulphate with high solubility; a high content of sulphates immediately available and a huge amount of organic matter from protein origin (>38%). The high agronomic efficiency of DERMAFERT NPK 6-7-13 BIO permit to optimise the supply of fertiliser unit, reducing the fertilisation costs and the environmental impact. The product is recommended for all the crops requiring a constant nitrogen supply, and is particularly suitable for potassium demanding crops and potassium deficient soils. It can be used for the autumn and spring basal fertilisation, as well as for top dressing applications in fruit trees and vineyards, especially with grasses conditions. The presence of potassium from sulphate and sulphates makes DERMAFERT NPK 6-7-13 BIO particularly suitable for the high quality crops, especially for those sensitive to chloride.