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FUNCTION OF NUTRIENTS
Nutrient  Symbol Function
nitrogen
N
1) Component of chlorophyll; amino acids, proteins and enzymes; 
    nucleic acids (RNA and DNA); some auxins and cytokinins. 
phosphorus
P
1) Component of the high energy compounds ATP, NADPH and NADP; nucleic acids (DNA and RNA); and phospholipids. 
potassium
K
1) Needed for protein and enzyme synthesis and activation. 
2) Involved in maintaining proper water balance 
3) Needed for photosynthesis.
magnesium
Mg
1) Component of chlorophyll. 
2) Activates many enzymes.
calcium
Ca
1) Ca pectates in middle lamella of cell wall cement cells together. 
2) Required for normal cell division and meristem growth. 
3) Stabilizes membranes
sulfur
S

1) Component of several amino acids (methionine, cystine, cysteine). 
iron
Fe
1) Required for chlorophyll synthesis. 
2) Component of many enzymes/carriers, especially those of electron  transport chain.
zinc
Zn

1) Required for tryptophan, hence auxin (IAA), synthesis. 
manganese
Mn
1) Required for chlorophyll synthesis. 
2) Activates many enzymes.
copper
Cu
1) Required for chlorophyll synthesis.
2) Component of many enzymes/carriers, esp. of electron transport chain. 
boron
B
1) Required for complete flowering and fruit development. 
2) Involved in translocation of carbohydrates and hormones.
molybdenum
Mo
1) Component of enzymes in N metabolism (nitrate to organic N) 
2) Component of enzymes in nitrogen fixation (N gas to ammonia) 
chlorine
Cl
1) Oxygen evolution in photosynthesis 
2) Stomatal functioning 
nickel
Ni

1) Component of several enzymes, especially urease (breaks down urea)