Plants show special symptoms in case of deficiency of any element. These symptoms are called Deficiency Symptoms or deficiency disease. We can ascertain the deficiency of any element by observing these symptoms. Deficiency symptoms of some elements are stated below:
Nitrogen (N): Formation of chlorophyll hampers for its shortage, as a result leaves become yellow. Young leaves become yellow at last. This process of becoming yellow is called Chlorosis. It reduces the development and rate of cell division, so reduces the growth of plants.
Phosphorus (P): Deficiency of Phosphorus causes the leaf to tern violet. Necrotic area develop on the leaf, reduces the growth of root, may cause root, leaf or flower fall.
Potassium (K): Leaf apex and margin becomes yellow and forms necrotic areas for the shortage of Potassium.
Iron (Fe): Due to the deficiency of Iron at first the young leaves become fade in colour, the middle of the narrow veins become fade first. Some times the whole leaf become discolour.
Magnesium (Mg): Older leaves become yellow first. Chlorosis develops at the intervenial spaces Necrotic area . develops on the leaf.
Boron (B): Deficiency of Boron reduces the growth of root. Top of the shoot dies and hamper the production of flower bud.