The pH value may be very variable.
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Silty soil is well-draining and has good fertility due to its high nutrient content. It retains moisture well and is easy to work with when gardening or farming. It is also good for supporting a variety of plant and crop types.
Depending on the type of soil, the value of pH and the type of pH paper. For an acid soil the pH paper from Merck (art. 9565) this color will be probable green.
While I can't find a specific pH value - it is certainly acidic - as it's used to 'neutralise' alkaline soil.
soil fertility increases soil PH
Knowing the pH value, enables the farmer to treat the soil to make it more acidic or alkaline - in order to make it suitable for the crops he wants to grow.