Soil pH in Tripp, SD: Lime or Sulfur?

Typical topsoil pH in Tripp, SD

Typical topsoil in Tripp, SD is pH 7.08, just outside the 6-7 range for vegetable garden. Test first; it may need nothing.

What Tripp needs, by plant

• Just outside, test first: lawn (cool-season grass) (off by 0.1), vegetable garden (off by 0.1), roses (off by 0.1).
• Beds or pots instead: tomatoes, potatoes, strawberries, blueberries, azaleas and rhododendrons, blue hydrangeas, pink hydrangeas.

What to do next

If your test lands near 7.08, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, roses.

How mixed the soil is

Of the 1,030,470 surveyed acres in Tripp, SD, 74% are near neutral (6.5-7.3), 26% are alkaline (above 7.3). Mapped soils run from pH 5.8 to 8.8, a spread of 3 units across 558 soil components. 74% 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 31.8% clay and 2.39% organic matter, which this site treats as clay. Moving it one pH unit takes about 11.5 lb of lime or 3.4 lb of sulfur per 100 sq ft. 39% of mapped components carry free carbonate (lime already in the ground), enough that sulfur gets neutralised before it does much.

Tripp against the rest of South Dakota

pH 7.08 is 0.09 above the South Dakota median of 6.99. 46 of 66 South Dakota counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Clay (7.07), Faulk (7.07), Day (7.08), Roberts (7.08), Fall River (7.1), McPherson (7.12), Ziebach (7.13), Gregory (7.15).

The range in South Dakota runs from Lawrence at 6.49 to Jones at 7.47; Tripp sits 60% of the way up.