Soil pH in Spotsylvania, VA: Lime or Sulfur?

Typical topsoil pH in Spotsylvania, VA

Typical topsoil in Spotsylvania, VA is pH 5.2, 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 Spotsylvania 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 5.2, 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 216,143 surveyed acres in Spotsylvania, VA, 65% are strongly acidic (below 5.5), 35% are moderately acidic (5.5-6.5). Mapped soils run from pH 4.6 to 6.3, a spread of 1.7 units across 140 soil components. 65% of the land falls in one class, so the county figure is a fair first guess for most yards here.

Clay, organic matter and rates

Topsoil here averages 14.2% clay and 1.65% 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.

Spotsylvania against the rest of Virginia

pH 5.2 is right at the Virginia median of 5.24. 56 of 127 Virginia counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Albemarle (5.19), King William (5.19), Covington City (5.19), Franklin (5.2), Amherst (5.23), Fauquier (5.23), Fluvanna (5.23), Tazewell (5.23).

The range in Virginia runs from Newport News City at 4.76 to Poquoson City at 6.36; Spotsylvania sits 28% of the way up.