With regard to potassium source and fertilisation management, tobacco does have a special need; combustibility, leaf colour, sugars and alkalinity are quality parameters negatively affected by chloride-containing fertilisers.

A relatively high daily nutrient uptake and a peak potassium requirement during the second stage of growth characterise tobacco as a short turn crop.

SOP is a key factor to guarantee higher yields and better quality, taking advantage of the direct availability of water-soluble potassium and sulphur, and the absence of chloride.