Soil pH in Pulaski, AR: Lime or Sulfur?

Typical topsoil pH in Pulaski, AR

Typical topsoil in Pulaski, AR is pH 5.62, too acidic for vegetable garden. Expect roughly 6.3 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Pulaski needs, by plant

• Already in range: potatoes, strawberries, azaleas and rhododendrons.
• Just outside, test first: blueberries (off by 0.1), blue hydrangeas (off by 0.1).
• Lime: lawn (cool-season grass) 6.3 lb/100 sq ft over 2 applications; vegetable garden 6.3 lb/100 sq ft over 2 applications; tomatoes 6.3 lb/100 sq ft over 2 applications; roses 6.3 lb/100 sq ft over 2 applications; pink hydrangeas 4.2 lb/100 sq ft.

What to do next

If your test confirms pH near 5.62, spread about 63 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 401,005 surveyed acres in Pulaski, AR, 69% are strongly acidic (below 5.5), 14% are moderately acidic (5.5-6.5), 11% are near neutral (6.5-7.3), 6% are alkaline (above 7.3). Mapped soils run from pH 4.6 to 7.9, a spread of 3.3 units across 71 soil components. 69% 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 20.1% clay and 1.62% 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. 5% of mapped components carry free carbonate (lime already in the ground).

Pulaski against the rest of Arkansas

pH 5.62 is 0.18 above the Arkansas median of 5.44. 49 of 75 Arkansas counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Hempstead (5.59), Prairie (5.59), Izard (5.6), Arkansas (5.62), Sharp (5.66), Jackson (5.67), Marion (5.68), Clay (5.7).

The range in Arkansas runs from Madison at 5.02 to Desha at 6.33; Pulaski sits 46% of the way up.