pH Tolerance

Soil pH levels:
1 = < 5.5 pH: Tolerant to strong acid conditions.
2 = 5.6 -  6.5 pH: Tolerant to weak acid conditions.
3 = 6.6 -  8.4 pH: Tolerant to neutral to moderately alkaline conditions.
4 = >8.5 pH: Tolerant to strongly alkaline conditions.