Potassium plays an important role in activating enzymes that provide the plant’s metabolic activities, therefore, in photosynthesis, efficient use of root water and transportation of nutrients in the plant. Potassium deficiency deteriorates the development of the pepper, which is observed as short growth and sparseness of its leaves. In the image below, the difference between a pepper seedling with enough potassium and a pepper with potassium deficiency can be clearly seen. In addition, another emerging symptom is the lightening of the leaf blade and staining in brown tones.