Soil pH in Putnam, GA: Lime or Sulfur?

Typical topsoil pH in Putnam, GA

Typical topsoil in Putnam, GA is pH 5.46, too acidic for vegetable garden. Expect roughly 7 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Putnam 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) 7 lb/100 sq ft over 2 applications; vegetable garden 7 lb/100 sq ft over 2 applications; tomatoes 7 lb/100 sq ft over 2 applications; roses 7 lb/100 sq ft over 2 applications; pink hydrangeas 5.6 lb/100 sq ft over 2 applications.

What to do next

If your test confirms pH near 5.46, spread about 70 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 218,707 surveyed acres in Putnam, GA, 52% are moderately acidic (5.5-6.5), 48% are strongly acidic (below 5.5). Mapped soils run from pH 4.8 to 6.2, a spread of 1.4 units across 41 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 20.6% clay and 1.22% 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.

Putnam against the rest of Georgia

pH 5.46 is 0.13 above the Georgia median of 5.33. 121 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: Heard (5.46), Lamar (5.46), Meriwether (5.46), Oconee (5.46), Clarke (5.47), Laurens (5.47), Oglethorpe (5.47), Butts (5.48).

The range in Georgia runs from Clinch at 4.64 to Elbert at 5.68; Putnam sits 79% of the way up.