Some important deficiency symptoms seen in plants are:-

• Stunting : 
The growth is retarded. The stem appears condensed and short. 

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• Chlorosis : 
It is the loss or non-development  
of chlorophyll resulting in the yellowing of leaves 

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• Necrosis : 
It is the localized death of tissue of leaves.
 
• Mottling : 
Appearance of green and non- green patches on the leaves.
 
•  Abscission : 
Premature fall of flowers, fruits and leaves.