Important in preserving the absorption capacity of the roots by maintaining the integrity of the plasma membrane, as well as preventing the loss of solutes to the external solution, increasing the accumulation of nutrients by the plant.
It has a structural role in plants, important in cell wall synthesis, pollen grain germination and pollen tube growth. Therefore, it is an essential nutrient for the fertilization of flowers, fixation of flower buds and formation of pods.
Deficiency – Stem, petioles and bud exhibit wilting, pods are deformed. The plant stops emitting new shoots. The lower leaves have small grayish spots, which are later affected by intense partial chlorosis, which starts at the base of the leaflet and progresses between the veins.