Fertilization using potassium fertilizers will increase the resistance of pistachio trees to Iranian Pistachio various stresses including salinity, water shortage and frost, as well as increase resistance to various pests and diseases.

If there is enough potassium in pistachio trees, the number of spikes and seeds, as well as the percentage of laughter and dry weight of seeds in pistachios will increase significantly. The point to consider about potassium is that the deficiency of this element is observed almost in most pistachio orchards in the country.

The main symptom of potassium deficiency in pistachio trees is leaf margin burns; It should be noted, however, that this burn was never seen early in the season, but rather becomes apparent over time. Other consequences of potassium deficiency include sunburn and reduced fruit ripening.

Many farmers and even experts confuse potassium deficiency with salinity stress. The difference between the two is that in salinity stress, unlike potassium deficiency, there is no blackening (or necrosis) of the leaf margins.