Soil pH in Jo Daviess, IL: Lime or Sulfur?

Typical topsoil pH in Jo Daviess, IL

Typical topsoil in Jo Daviess, IL is pH 6.45, already right for vegetable garden (6-7). Test before adding anything.

What Jo Daviess needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, strawberries, roses, pink hydrangeas.
• Sulfur: potatoes 2.3 lb/100 sq ft over 2 applications; blueberries 3.5 lb/100 sq ft over 2 applications; azaleas and rhododendrons 2.8 lb/100 sq ft over 2 applications; blue hydrangeas 2.8 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.45, 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 371,056 surveyed acres in Jo Daviess, IL, 49% are near neutral (6.5-7.3), 49% are moderately acidic (5.5-6.5), 1% are alkaline (above 7.3). Mapped soils run from pH 4.3 to 7.9, a spread of 3.6 units across 267 soil components. No single class covers 60% of the county, so two gardens a few miles apart here can need opposite treatments. Test your own bed.

Clay, organic matter and rates

Topsoil here averages 20.9% clay and 2.34% 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).

Jo Daviess against the rest of Illinois

pH 6.45 is 0.05 above the Illinois median of 6.4. 64 of 102 Illinois counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Macon (6.44), Montgomery (6.44), Wayne (6.44), Henry (6.45), Ogle (6.45), Iroquois (6.46), Jersey (6.46), Peoria (6.46).

The range in Illinois runs from Pope at 5.5 to Grundy at 6.75; Jo Daviess sits 76% of the way up.