Soil pH in Madison, IN: Lime or Sulfur?

Typical topsoil pH in Madison, IN

Typical topsoil in Madison, IN is pH 6.63, already right for vegetable garden (6-7). Test before adding anything.

What Madison needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, roses.
• Just outside, test first: strawberries (off by 0.1), pink hydrangeas (off by 0.1).
• Sulfur: potatoes 2.5 lb/100 sq ft over 2 applications; blueberries 3.7 lb/100 sq ft over 2 applications; azaleas and rhododendrons 3.2 lb/100 sq ft over 2 applications; blue hydrangeas 3.2 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.63, 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 283,409 surveyed acres in Madison, IN, 61% are near neutral (6.5-7.3), 39% are moderately acidic (5.5-6.5). Mapped soils run from pH 5.2 to 7.9, a spread of 2.7 units across 210 soil components. 61% 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 20.7% clay and 3.02% 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. 2% of mapped components carry free carbonate (lime already in the ground).

Madison against the rest of Indiana

pH 6.63 is 0.28 above the Indiana median of 6.35. 87 of 92 Indiana counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Howard (6.56), Boone (6.59), Tipton (6.6), Benton (6.61), Johnson (6.67), Hendricks (6.69), Marion (6.71), Hamilton (6.74).

The range in Indiana runs from Brown at 4.97 to Hamilton at 6.74; Madison sits 94% of the way up.