Home / Roofert / Straight Fertilisers / Zinc Sulphate Zinc Sulphate Zinc Sulphate 33Zn + 16S is helpful in increasing plant growth and development. Category: Straight Fertilisers Tags: 25kg, Roofert, straight, Zinc Sulphate Description Description Zinc: 33% Sulphur: 16% Packaging: 25kg Related products Straight Fertilisers Potassium Sulphate Potassium Sulphate is an excellent source of potassium & sulphur for plants, it is frequently used for crops where additional chlorine is undesirable. Straight Fertilisers Mono Potassium Phosphate (MKP) A high purity fertiliser that contains the highest concentration of macronutrients. Straight Fertilisers Magnesium Nitrate Nitrate facilitates the uptake of magnesium in plants Nitrogen: 11% Magnesium: 24.9% Straight Fertilisers Urea Phosphate Urea Phosphate 18-44-0 is a unique product because it is the only dry, strong acid in crystalline form. Thanks to its acidic action, it considerably increases the absorption of nutrients from the soil.