Soil pH in Harding, NM: Lime or Sulfur?

Typical topsoil pH in Harding, NM

Typical topsoil in Harding, NM is pH 7.61 and calcareous, so sulfur won't lower it for long. For vegetable garden, choose alkaline-tolerant varieties and add compost rather than fighting the soil.

What Harding needs, by plant

• Beds or pots instead: lawn (cool-season grass), vegetable garden, tomatoes, potatoes, strawberries, roses, blueberries, azaleas and rhododendrons, blue hydrangeas, pink hydrangeas.

What to do next

If your test confirms pH near 7.61, consider raised beds for anything acid-loving; with 71% of soils here carrying free lime, sulfur will not hold.

How mixed the soil is

Of the 1,217,954 surveyed acres in Harding, NM, 60% are alkaline (above 7.3), 40% are near neutral (6.5-7.3). Mapped soils run from pH 6.9 to 8.5, a spread of 1.6 units across 371 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 17.1% clay and 1.28% 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. 71% of mapped components carry free carbonate (lime already in the ground), enough that sulfur gets neutralised before it does much.

Harding against the rest of New Mexico

pH 7.61 is right at the New Mexico median of 7.65. 13 of 33 New Mexico counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Roosevelt (7.54), Santa Fe (7.55), Union (7.57), Eddy (7.61), San Miguel (7.63), McKinley (7.65), Quay (7.66), Sandoval (7.7).

The range in New Mexico runs from Colfax at 6.99 to Valencia at 8.07; Harding sits 57% of the way up.