Soil pH in New London, CT: Lime or Sulfur?
Typical topsoil pH in New London, CT
Typical topsoil in New London, CT is pH 5.14, too acidic for vegetable garden. Expect roughly 9.8 lb of lime per 100 sq ft, but only after a soil test confirms it.
What New London needs, by plant
- Already in range: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.
- Lime: lawn (cool-season grass) 9.8 lb/100 sq ft over 2 applications; vegetable garden 9.8 lb/100 sq ft over 2 applications; tomatoes 9.8 lb/100 sq ft over 2 applications; strawberries 6.3 lb/100 sq ft over 2 applications; roses 9.8 lb/100 sq ft over 2 applications; pink hydrangeas 7.7 lb/100 sq ft over 2 applications.
What to do next
If your test confirms pH near 5.14, spread about 98 lb of ground limestone per 1,000 sq ft of vegetable bed in 2 doses, ideally in fall.
How mixed the soil is
Of the 409,117 surveyed acres in New London, CT, 68% are strongly acidic (below 5.5), 28% are moderately acidic (5.5-6.5), 3% are near neutral (6.5-7.3), 1% are alkaline (above 7.3). Mapped soils run from pH 3.8 to 7.9, a spread of 4.1 units across 704 soil components. 68% 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 7.6% clay and 6.78% organic matter, which this site treats as loam. At 6.78% organic matter the soil buffers like a heavier one, which pushes it into the loam bracket. Moving it one pH unit takes about 7 lb of lime or 2.3 lb of sulfur per 100 sq ft. 1% of mapped components carry free carbonate (lime already in the ground).
New London against the rest of Connecticut
pH 5.14 is 0.09 below the Connecticut median of 5.23. 2 of 8 Connecticut counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.
Closest in pH within the state: Tolland (5.07), Windham (5.07), Middlesex (5.21), Litchfield (5.25), Fairfield (5.26), New Haven (5.29).
The range in Connecticut runs from Tolland at 5.07 to Hartford at 5.33; New London sits 27% of the way up.