Another major factor in nutrient uptake by trees from soil is soil pistachio shell acidity or soil pH. Soil acidity directly affects soil microorganisms as well as the uptake of various nutrients. Soil pH determines which elements are absorbed by the roots and which are not. At low acidity (acidic pH) elements such as zinc, manganese, aluminum, copper and cobalt are highly absorbable and, conversely, at high pH can not be absorbed by plants. This is what has happened in the soil conditions of pistachio orchards in Kerman province and has caused the lack of microelements to be observed in almost all pistachio orchards due to the high pH of the soil.
