It has considerable importance in carbon metabolism. It is also responsible for storing energy in photosynthesis and respiration, as well as energy for protein synthesis reactions, biological nitrogen fixation, ionic absorption, and others.
Deficiency – Causes growth delay, and chlorotic areas with necrotic spots appear on old leaves, causing premature defoliation, reducing the production of commercial roots.
Fewer tubers, smaller tubers, stunted plants, yellowing of older leaves, younger small dark green leaves. P deficiency leads to reduced early vigor, delayed maturation and reduced yields.