Potassium is one of necessary nutrients for plants, located in soil. Due to the ease of combining potassium with oxygen and water, this element is not present in nature in its free state, but only in the form of various compounds. The main ingredient of the product is potassium chloride (KCl), received from non-treated potassium salts. Granular potassium salt contains 60% (m/m) of potassium per water-soluble K2O. It was confirmed that potassium stimulates more than 40 various enzymatic processes in a plant, among others, it participates in the synthesis of proteins, and carbohydrates. Various functions of potassium, and its content in the soil determine the growth and proper development of plants. With severe deficiency of potassium, plants face inhibited growth, withering, yellowing, and, as a consequence, dying.