Soil pH in Bronx, NY: Lime or Sulfur?

Typical topsoil pH in Bronx, NY

Typical topsoil in Bronx, NY is pH 6.51, already right for vegetable garden (6-7). Test before adding anything.

What Bronx needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, roses.
• Just outside, test first: strawberries (off by 0), pink hydrangeas (off by 0).
• Beds or pots instead: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.

What to do next

If your test lands near 6.51, 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 26,370 surveyed acres in Bronx, NY, 58% are near neutral (6.5-7.3), 19% are moderately acidic (5.5-6.5), 14% are alkaline (above 7.3), 10% are strongly acidic (below 5.5). Mapped soils run from pH 3.8 to 8.6, a spread of 4.8 units across 605 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 7.2% clay and 1.7% 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. 71% of mapped components carry free carbonate (lime already in the ground), enough that sulfur gets neutralised before it does much.

Bronx against the rest of New York

pH 6.51 is 0.74 above the New York median of 5.77. 58 of 62 New York counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Niagara (6.34), Ontario (6.39), Seneca (6.42), Genesee (6.43), New York (6.91), Queens (6.99), Kings (7.15).

The range in New York runs from Hamilton at 4.72 to Kings at 7.15; Bronx sits 74% of the way up.