Potassium plays an important role in photosynthesis and starch production, enzyme activity and plant resistance to diseases.
It is closely related to the quality of the fruit, in particular rind color, aroma and size. It also influences the regulation of water in the cell, controlling the loss of water from the leaves by transpiration. It is the most important nutrient in terms of fruit production and quality.
Deficiency – Older leaves show irregularly distributed concentrations of yellowish color. The leaves are smaller and more pronounced, the pits increase and coalesce, and the leaf area becomes necrotic along the margins. Leaf fall occurs only when they are completely dead.