Once a year or every 2 years. Sometimes I'll test twice a year for an
item that was "treated" to see if I need more. For example, if the pH
is 5.2, I'll add lime and test again in 6 months; then if it is 5.9,
I'll add more lime to the soil. I test for Nitrogen, Potassium,
Potash, and acidity. There are lots of other things to test. I know
adding organic amendments helps balance the pH and adds small amounts
of other important elements. If plants are not growing well, testing
the soil (perhaps a more comprehensive laboratory test) is included in
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