Soil pH in Pontotoc, OK: Lime or Sulfur?

Typical topsoil pH in Pontotoc, OK

Typical topsoil in Pontotoc, OK is pH 6.27, already right for vegetable garden (6-7). Test before adding anything.

What Pontotoc needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, strawberries, roses, pink hydrangeas.
• Sulfur: potatoes 1.8 lb/100 sq ft; blueberries 3 lb/100 sq ft over 2 applications; azaleas and rhododendrons 2.3 lb/100 sq ft over 2 applications; blue hydrangeas 2.3 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.27, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, tomatoes, strawberries, roses, pink hydrangeas.

How mixed the soil is

Of the 418,866 surveyed acres in Pontotoc, OK, 64% are moderately acidic (5.5-6.5), 26% are near neutral (6.5-7.3), 6% are alkaline (above 7.3), 5% are strongly acidic (below 5.5). Mapped soils run from pH 5.3 to 8.2, a spread of 2.9 units across 143 soil components. 64% 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 21% clay and 1.92% 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).

Pontotoc against the rest of Oklahoma

pH 6.27 is 0.28 below the Oklahoma median of 6.55. 27 of 77 Oklahoma counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Nowata (6.15), Okfuskee (6.15), Choctaw (6.19), Washington (6.19), Seminole (6.33), Osage (6.34), Oklahoma (6.35), Stephens (6.35).

The range in Oklahoma runs from Adair at 5.12 to Beaver at 7.65; Pontotoc sits 45% of the way up.