DUETTO (NPK 5.5.8 + 2MgO) is suitable for fertilization of crops with quick growth rates (leaf and fruit vegetables) and for crops that require great quantity of potassium, for which quality is the most important factor for production (vineyard, fruit plants, tobacco etc.). DUETTO provides high level of organic matter, which improves the soil structure and activates the micro-organisms, reducing the soil exhaustion.