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In terms of the role of endoplasmic reticulum in terms pistachio shell of the amount of calcium required, it is classified as a trace element. Apoplasmically, calcium is considered a consumable element (due to the role of the element in the cell wall).

In the case of pistachios, calcium is needed much more than the nutrients consumed. Absorption of calcium by pistachios can be absorbed only from the tips of lethal filaments, which are still primary meristems and do not have a Caspian ring around the root cells. Therefore, calcium uptake is possible only during the rooting stage and the formation of lethal fibers.

This time is limited to the stage after pollination (second half of April) and the end of the growing season (September and October).

Movement of calcium inside the pistachio tree

Calcium is transported from the roots by woody vessels to the upper limbs of the tree.

Calcium movement in the woody vessels of the pistachio tree

Due to the low concentration and acidic reaction of woody vessels, the movement of calcium is not a problem.

Calcium movement in the phloem vessels of the pistachio tree

The pH of the phloem vessels is alkaline and the sap is concentrated. As a result, the movement of calcium is slow.