Soil pH in Androscoggin, ME: Lime or Sulfur?

Typical topsoil pH in Androscoggin, ME

Typical topsoil in Androscoggin, ME is pH 4.94, too acidic for vegetable garden. Expect roughly 4.8 lb of lime per 100 sq ft, but only after a soil test confirms it.

What Androscoggin needs, by plant

• Already in range: blueberries, azaleas and rhododendrons.
• Just outside, test first: potatoes (off by 0.1), blue hydrangeas (off by 0.1).
• Lime: lawn (cool-season grass) 4.8 lb/100 sq ft; vegetable garden 4.8 lb/100 sq ft; tomatoes 4.8 lb/100 sq ft; strawberries 3.3 lb/100 sq ft; roses 4.8 lb/100 sq ft; pink hydrangeas 3.9 lb/100 sq ft.

What to do next

If your test confirms pH near 4.94, spread about 48 lb of ground limestone per 1,000 sq ft of vegetable bed, ideally in fall.

How mixed the soil is

Of the 297,737 surveyed acres in Androscoggin, ME, 84% are strongly acidic (below 5.5), 16% are moderately acidic (5.5-6.5). Mapped soils run from pH 4 to 7.9, a spread of 3.9 units across 452 soil components. 84% 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 8% clay and 4.69% organic matter, which this site treats as sandy. Moving it one pH unit takes about 3 lb of lime or 1.2 lb of sulfur per 100 sq ft. None of the mapped components carry free carbonate.

Androscoggin against the rest of Maine

pH 4.94 is 0.06 above the Maine median of 4.88. 13 of 16 Maine counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.

Closest in pH within the state: Kennebec (4.91), Sagadahoc (4.92), Lincoln (4.93), Washington (4.93), Penobscot (4.97), Cumberland (5.01).

The range in Maine runs from Piscataquis at 4.59 to Cumberland at 5.01; Androscoggin sits 83% of the way up.