LaMotte HESTER SOIL TEST ST-H - Manual (Page 3)

5. Add two drops of the chosen narrow range indicator to the second
sample on the spot plate. Compare the resulting color reaction
against the appropriate color chart to obtain a precise soil pH reading.
The five narrow range pH tests are:
INTERPRETATION OF pH READING:
If the pH is Then the soil is
Below 5.5 Strongly Acid
5.5-6.0 Moderately Acid
6.1-7.0 Slightly Acid
Above 7.0 Alkaline
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