pH testing of coastal sandy soils
I am trying to determine the pH of my soil to see if I need to ad lime for some of my plants, like peaches, figs and roses. I purchased a Rapitest pH Meter #1840.
I live in coastal Georgia about 500 feet from a tidal marsh. I tried testing my soil with the meter. I moved all debris from on top, drenched it with distilled water, inserted the probe, and it just barely moved up to maybe 7.25 pH. I have questions as to this being the pH, as my property has lots of mature azaleas and blue hydrangeas as well as mature 300 year old live oak trees and many southern yellow pine trees. None of these would do well in alkaline soil.
The soil is almost completely sand with a little organic material (no clay, silt or gravel). Coastal water table is maybe 6' deep. May be a lot of salts in the soil. How do I determine the actual pH? Or is this possibly the actual pH. I don't know much about the soils around here.