Phosphorus (P) : It forms the constituent of cell membrane protein, nucleic acids, nucleotids, ATP, NADP and energy rich compounds.
Deficiency symptoms : It causes poor growth, leaves become dull green and chlorosis occurs.
Iron (Fe) : It helps in chlorophyll synthesis cytochrome synthesis, ferredoxin synthesis, activates enzyme and activates catalase.
Deficiency system : It results in chlorosis.
Zinc (Zn) : It activates enzyme synthesis. It is a constituent of carbonic anhydrase. This is also a constituent of dehydrogenase.
Deficiency system : Leaves are not properly formed