Common Nutrient Ranges For Hydroponics

Element

Ionic forms absorbed by plants

common range
(ppm = mg/l)

Nitrogen

 Nitrate (NO3^-),   Ammonium (NH₄⁺)

100-250

Phosphorus

 H₂PO₄^-, PO₄^3-,   HPO₄^2-

30-50

Potassium

 Potassium (K⁺)

100-300

Calcium

 Calcium (Ca²⁺)

80-140

Magnesium

 Magnesium (Mg²⁺)

30-70

Sulfur

 Sulfate (SO₄^2-)

50-120

Iron

 Fe²⁺, Fe³⁺ 

1.0-3.0

Copper

 Copper (Cu²⁺)

0.08-0.2

Manganese

 Manganese (Mn²⁺)

0.5-1.0

Zinc

 Zinc (Zn²⁺)

0.3-0.6

Molybdenum

  Molybdate (MoO₄^2-)

0.04-0.08

Boron

 BO₃^2-, B₄O₇^2-

0.2-0.5

Chloride

 Chloride (Cl^-)

<75

Sodium

<50