Soil pH in Union, KY: Lime or Sulfur?

Typical topsoil pH in Union, KY

Typical topsoil in Union, KY is pH 6.19, already right for vegetable garden (6-7). Test before adding anything.

What Union needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, strawberries, roses, pink hydrangeas.
• Just outside, test first: tomatoes (off by 0), 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 2.1 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.19, 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 215,552 surveyed acres in Union, KY, 65% are moderately acidic (5.5-6.5), 32% are near neutral (6.5-7.3), 3% are strongly acidic (below 5.5). Mapped soils run from pH 3.6 to 8.3, a spread of 4.7 units across 221 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 20% clay and 1.86% 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).

Union against the rest of Kentucky

pH 6.19 is 0.4 above the Kentucky median of 5.79. 98 of 120 Kentucky counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Shelby (6.13), Madison (6.14), Pendleton (6.14), Robertson (6.18), Boyle (6.21), Henry (6.21), Mason (6.25), Garrard (6.26).

The range in Kentucky runs from Greenup at 5.09 to Carroll at 6.63; Union sits 71% of the way up.