Soil pH in Douglas, NE: Lime or Sulfur?

Typical topsoil pH in Douglas, NE

Typical topsoil in Douglas, NE is pH 6.65, already right for vegetable garden (6-7). Test before adding anything.

What Douglas needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, roses.
• Just outside, test first: strawberries (off by 0.2), pink hydrangeas (off by 0.2).
• Sulfur: potatoes 2.8 lb/100 sq ft over 2 applications; blueberries 3.9 lb/100 sq ft over 2 applications; azaleas and rhododendrons 3.2 lb/100 sq ft over 2 applications; blue hydrangeas 3.2 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.65, 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 165,263 surveyed acres in Douglas, NE, 50% are moderately acidic (5.5-6.5), 26% are near neutral (6.5-7.3), 25% are alkaline (above 7.3). Mapped soils run from pH 5.3 to 8.5, a spread of 3.2 units across 194 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 25.4% clay and 2.14% 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. 22% of mapped components carry free carbonate (lime already in the ground).

Douglas against the rest of Nebraska

pH 6.65 is 0.1 below the Nebraska median of 6.75. 39 of 93 Nebraska counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Logan (6.59), Loup (6.59), Wheeler (6.59), Kearney (6.6), Garfield (6.65), Webster (6.65), Hall (6.68), Franklin (6.72).

The range in Nebraska runs from Fillmore at 5.88 to Scotts Bluff at 7.58; Douglas sits 45% of the way up.