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Nutrient pH Ranges
Optimal pH
Can be Toxic
Non-Toxic
Unavailable
4
5
6
7
8
9
4
5
6
7
8
9
Nitrogen (Nitrate)
NO
3
-
5.5 - 7+
< 4
3.5 - 9.5
Nitrogen (Ammonium)
NH
4
+
5.5 - 6.5
< 5
> 7
5 - 9.5
Phosphorus (P)
H
2
PO
4
-
/HPO
4
2
-
5.5 - 6.5
3.5 - 5
7 - 9.5
3.5 - 9.5
Potassium (K)
K
+
5.5 - 7+
< 5.5
3.5 - 9.5
Sulfur (S)
SO
4
2
-
5.5 - 7+
< 5.5
3.5 - 9.5
Calcium (Ca)
Ca
2
+
6 - 7+
< 5.5
3.5 - 9.5
Magnesium (Mg)
Mg
2
+
6 - 7+
< 5.5
3.5 - 9.5
Iron (Fe)
Fe
2
+
/Fe
3
+
5.5 - 6
< 4.5
> 6.5
4.5 - 9.5
Manganese (Mn)
Mn
2
+
5 - 6.5
< 5
> 7
5 - 9.5
Boron (B)
H
3
BO
3
5 - 7
3.5 - 5
7 - 9.5
3.5 - 9.5
Zinc (Zn)
Zn
2
+
5 - 6.5
< 5
> 7
5 - 9.5
Copper (Cu)
Cu
2
+
5 - 6.5
< 5
> 7
5 - 9.5
Molybdenum (Mo)
MoO
4
2
-
> 6
< 5.5
3.5 - 9.5
