Soil pH in New Madrid, MO: Lime or Sulfur?

Typical topsoil pH in New Madrid, MO

Typical topsoil in New Madrid, MO is pH 6.22, already right for vegetable garden (6-7). Test before adding anything.

What New Madrid needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, strawberries, roses, pink hydrangeas.
• Just outside, test first: potatoes (off by 0.2), azaleas and rhododendrons (off by 0.2).
• Sulfur: blueberries 2.8 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 6.22, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, tomatoes, potatoes, strawberries, roses, azaleas and rhododendrons, pink hydrangeas.

How mixed the soil is

Of the 393,740 surveyed acres in New Madrid, MO, 68% are moderately acidic (5.5-6.5), 29% are near neutral (6.5-7.3), 4% are strongly acidic (below 5.5). Mapped soils run from pH 4.5 to 7.7, a spread of 3.2 units across 193 soil components. 68% 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 25.5% clay and 1.78% 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.

New Madrid against the rest of Missouri

pH 6.22 is 0.09 above the Missouri median of 6.13. 65 of 114 Missouri counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Lincoln (6.19), DeKalb (6.21), Pemiscot (6.21), Mississippi (6.22), Johnson (6.24), Lafayette (6.24), Clark (6.25), Worth (6.25).

The range in Missouri runs from Carter at 5.08 to Knox at 6.71; New Madrid sits 70% of the way up.