Soil pH in Wyoming, PA: Lime or Sulfur?

Typical topsoil pH in Wyoming, PA

Typical topsoil in Wyoming, PA is pH 5.55, too acidic for vegetable garden. Expect roughly 11.5 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Wyoming needs, by plant

• Already in range: potatoes, strawberries, azaleas and rhododendrons.
• Just outside, test first: blueberries (off by 0), blue hydrangeas (off by 0).
• Lime: lawn (cool-season grass) 11.5 lb/100 sq ft over 3 applications; vegetable garden 11.5 lb/100 sq ft over 3 applications; tomatoes 11.5 lb/100 sq ft over 3 applications; roses 11.5 lb/100 sq ft over 3 applications; pink hydrangeas 8 lb/100 sq ft over 2 applications.

What to do next

If your test confirms pH near 5.55, spread about 115 lb of ground limestone per 1,000 sq ft of vegetable bed in 3 doses, ideally in fall.

How mixed the soil is

Of the 247,202 surveyed acres in Wyoming, PA, 59% are moderately acidic (5.5-6.5), 31% are strongly acidic (below 5.5), 10% are near neutral (6.5-7.3). Mapped soils run from pH 4.5 to 6.6, a spread of 2.1 units across 295 soil components. No single class covers 60% of the county, so two gardens a few miles apart here can need opposite treatments. Test your own bed.

Clay, organic matter and rates

Topsoil here averages 15.2% clay and 8.46% organic matter, which this site treats as clay. At 8.46% organic matter the soil buffers like a heavier one, which pushes it into the clay bracket. Moving it one pH unit takes about 11.5 lb of lime or 3.4 lb of sulfur per 100 sq ft. None of the mapped components carry free carbonate.

Wyoming against the rest of Pennsylvania

pH 5.55 is 0.24 above the Pennsylvania median of 5.31. 45 of 67 Pennsylvania counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Dauphin (5.47), Philadelphia (5.47), Lackawanna (5.5), Cumberland (5.55), York (5.57), Franklin (5.58), Allegheny (5.6), Lebanon (5.63).

The range in Pennsylvania runs from Forest at 4.57 to Greene at 6.07; Wyoming sits 65% of the way up.