Soil pH in Johnson, GA: Lime or Sulfur?

Typical topsoil pH in Johnson, GA

Typical topsoil in Johnson, GA is pH 5.45, too acidic for vegetable garden. Expect roughly 3 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Johnson needs, by plant

• Already in range: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.
• Just outside, test first: strawberries (off by 0).
• Lime: lawn (cool-season grass) 3 lb/100 sq ft; vegetable garden 3 lb/100 sq ft; tomatoes 3 lb/100 sq ft; roses 3 lb/100 sq ft; pink hydrangeas 2.4 lb/100 sq ft.

What to do next

If your test confirms pH near 5.45, spread about 30 lb of ground limestone per 1,000 sq ft of vegetable bed, ideally in fall.

How mixed the soil is

Of the 166,045 surveyed acres in Johnson, GA, 53% are strongly acidic (below 5.5), 47% are moderately acidic (5.5-6.5). Mapped soils run from pH 4.6 to 6.2, a spread of 1.6 units across 60 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 9.1% clay and 1.49% organic matter, which this site treats as sandy. Moving it one pH unit takes about 3 lb of lime or 1.2 lb of sulfur per 100 sq ft. None of the mapped components carry free carbonate.

Johnson against the rest of Georgia

pH 5.45 is 0.12 above the Georgia median of 5.33. 116 of 159 Georgia counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Upson (5.44), Coweta (5.45), Crawford (5.45), Habersham (5.45), Walton (5.45), Heard (5.46), Lamar (5.46), Meriwether (5.46).

The range in Georgia runs from Clinch at 4.64 to Elbert at 5.68; Johnson sits 78% of the way up.