Soil pH in Lincoln, KY: Lime or Sulfur?

Typical topsoil pH in Lincoln, KY

Typical topsoil in Lincoln, KY is pH 5.91, just outside the 6-7 range for vegetable garden. Test first; it may need nothing.

What Lincoln needs, by plant

• Already in range: potatoes, strawberries, azaleas and rhododendrons.
• Just outside, test first: lawn (cool-season grass) (off by 0.1), vegetable garden (off by 0.1), roses (off by 0.1), pink hydrangeas (off by 0.1).
• Lime: tomatoes 4.2 lb/100 sq ft.
• Sulfur: blueberries 2.1 lb/100 sq ft over 2 applications; blue hydrangeas 1.6 lb/100 sq ft.

What to do next

If your test lands near 5.91, 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 189,730 surveyed acres in Lincoln, KY, 52% are moderately acidic (5.5-6.5), 28% are near neutral (6.5-7.3), 18% are strongly acidic (below 5.5), 2% are alkaline (above 7.3). Mapped soils run from pH 4.1 to 7.9, a spread of 3.8 units across 189 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 21.4% clay and 2.09% 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. 5% of mapped components carry free carbonate (lime already in the ground).

Lincoln against the rest of Kentucky

pH 5.91 is 0.12 above the Kentucky median of 5.79. 70 of 120 Kentucky counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Casey (5.85), Livingston (5.85), Cumberland (5.89), Oldham (5.89), Perry (5.91), Barren (5.92), Daviess (5.92), Carlisle (5.94).

The range in Kentucky runs from Greenup at 5.09 to Carroll at 6.63; Lincoln sits 53% of the way up.