Soil pH in Montgomery, NC: Lime or Sulfur?

Typical topsoil pH in Montgomery, NC

Typical topsoil in Montgomery, NC is pH 5.24, too acidic for vegetable garden. Expect roughly 9.1 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Montgomery needs, by plant

• Already in range: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.
• Lime: lawn (cool-season grass) 9.1 lb/100 sq ft over 2 applications; vegetable garden 9.1 lb/100 sq ft over 2 applications; tomatoes 9.1 lb/100 sq ft over 2 applications; strawberries 5.6 lb/100 sq ft over 2 applications; roses 9.1 lb/100 sq ft over 2 applications; pink hydrangeas 7 lb/100 sq ft over 2 applications.

What to do next

If your test confirms pH near 5.24, spread about 91 lb of ground limestone per 1,000 sq ft of vegetable bed in 2 doses, ideally in fall.

How mixed the soil is

Of the 294,745 surveyed acres in Montgomery, NC, 52% are moderately acidic (5.5-6.5), 48% are strongly acidic (below 5.5). Mapped soils run from pH 4.5 to 6.2, a spread of 1.7 units across 217 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 16% clay and 1.26% organic matter, which this site treats as loam. Moving it one pH unit takes about 7 lb of lime or 2.3 lb of sulfur per 100 sq ft. None of the mapped components carry free carbonate.

Montgomery against the rest of North Carolina

pH 5.24 is 0.08 above the North Carolina median of 5.16. 57 of 100 North Carolina counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Moore (5.22), New Hanover (5.23), Richmond (5.23), Caldwell (5.24), Henderson (5.25), Buncombe (5.26), Lee (5.28), Alleghany (5.32).

The range in North Carolina runs from Swain at 4.56 to Davie at 5.9; Montgomery sits 51% of the way up.