In plants, the common symptom caused by the deficiency of K, P, Ca, and Mg is the

In plants, the common symptom caused by the deficiency of K, P, Ca and Mg is the Appearance of necrotic areas in the leaves.
Necrosis is the condition in plants when plants undergo abiotic stress they initiate rapid cell death with necrotic morphology. In simple words, it is the death of the tissue in a localized affected area.