Potassium nitrate NK 13.7-46.2 Highly-efficient nitrogen- and potassium-containing water- soluble fertilizer with high K20 content. SOLAR SOLAR Potassium nitrate is considered to be a standard of chemical purity among similar products. Application of potassium nitrate increases stress resistance of plants and improves quality of yield.Ideal for use in greenhouses, fertigation systems, as well as for foliar fertilization of cereals, vegetables, fruits and ornamental crops. Store in a dry the exposures