Soil pH in Monroe, WI: Lime or Sulfur?

Typical topsoil pH in Monroe, WI

Typical topsoil in Monroe, WI is pH 5.84, just outside the 6-7 range for vegetable garden. Test first; it may need nothing.

What Monroe needs, by plant

• Already in range: potatoes, strawberries, azaleas and rhododendrons.
• Just outside, test first: lawn (cool-season grass) (off by 0.2), vegetable garden (off by 0.2), roses (off by 0.2), pink hydrangeas (off by 0.2).
• Lime: tomatoes 4.9 lb/100 sq ft.
• Sulfur: blueberries 1.8 lb/100 sq ft; blue hydrangeas 1.4 lb/100 sq ft.

What to do next

If your test lands near 5.84, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, potatoes, strawberries, roses, azaleas and rhododendrons, pink hydrangeas.

How mixed the soil is

Of the 564,163 surveyed acres in Monroe, WI, 65% are moderately acidic (5.5-6.5), 18% are strongly acidic (below 5.5), 16% are near neutral (6.5-7.3). Mapped soils run from pH 3.7 to 8, a spread of 4.3 units across 542 soil components. 65% 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 10.8% clay and 3.05% 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. 0% of mapped components carry free carbonate (lime already in the ground).

Monroe against the rest of Wisconsin

pH 5.84 is 0.24 below the Wisconsin median of 6.08. 28 of 72 Wisconsin counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Marathon (5.74), Marinette (5.77), Portage (5.78), Chippewa (5.82), Barron (5.9), Shawano (5.98), Trempealeau (6), Dunn (6.06).

The range in Wisconsin runs from Iron at 5.16 to Washington at 6.88; Monroe sits 40% of the way up.