Nutrients Classification

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NUTRIENT	CHEMICAL SYMBOL	IONIC FORM TAKEN UP BY THE PLANTS	TYPICAL CONCENTRATION IN SOILS	TYPICAL CONCENTRATION IN PLANTS
Macronutrients
Nitrogen	N	NO₃^- ; NH₄⁺	0.3 - 1 %	1.5 %
Phosphorus	P	HPO₄^2- ; H₂PO₄^-	0.02 - 0.5 %	0.2 %
Potassium	K	K⁺	0.05 - 3.8 %	1 %
Secondary nutrients
Calcium	Ca	Ca²⁺	0.7 %	0.5 %
Magnesium	Mg	Mg²⁺	0.6 %	0.2 %
Sulphur	S	SO₄^2-	30 - 500 ppm	0.1 %
Micronutrients
Iron	Fe	Fe²⁺; Fe(OH)₂⁺; Fe(OH)²⁺; Fe³⁺	1 - 6 %	100 ppm
Manganese	Mn	Mn²⁺	120 - 6000 ppm	50 ppm
Zinc	Zn	Zn²⁺	10 -130 ppm	20 ppm
Boron	B	H₃BO₃; H₂BO₃^-	4 - 100 ppm	20 ppm
Copper	Cu	Cu³⁺; Cu(OH)⁺	1-100 ppm	6 ppm
Molybdenum	Mo	MoO₄^2-; HMoO₄^-	0.1 -40 ppm	0.1 -0.6 ppm
Cobalt	Co	Co²⁺	1 -40 ppm	0.1 ppm
Chloride	Cl	Cl^-	7 - 50 ppm	35 - 2000 ppm