Soil pH in Lamb, TX: Lime or Sulfur?

Typical topsoil pH in Lamb, TX

Typical topsoil in Lamb, TX is pH 7.55, too alkaline for vegetable garden. Expect roughly 2.3 lb of sulfur per 100 sq ft, but only after a soil test confirms it.

What Lamb needs, by plant

• Sulfur: lawn (cool-season grass) 2.3 lb/100 sq ft over 2 applications; vegetable garden 2.3 lb/100 sq ft over 2 applications; tomatoes 2.3 lb/100 sq ft over 2 applications; potatoes 4.8 lb/100 sq ft over 3 applications; strawberries 3.5 lb/100 sq ft over 2 applications; roses 2.3 lb/100 sq ft over 2 applications; blueberries 6 lb/100 sq ft over 3 applications; azaleas and rhododendrons 5.3 lb/100 sq ft over 3 applications; blue hydrangeas 5.3 lb/100 sq ft over 3 applications; pink hydrangeas 3 lb/100 sq ft over 2 applications.

What to do next

If your test confirms pH near 7.55, work in about 23 lb of elemental sulfur per 1,000 sq ft of vegetable bed in 2 doses.

How mixed the soil is

Of the 648,222 surveyed acres in Lamb, TX, 73% are alkaline (above 7.3), 27% are near neutral (6.5-7.3). Mapped soils run from pH 6.6 to 8.4, a spread of 1.8 units across 205 soil components. 73% 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 16.4% clay and 1.31% 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. 23% of mapped components carry free carbonate (lime already in the ground).

Lamb against the rest of Texas

pH 7.55 is 0.12 above the Texas median of 7.43. 150 of 254 Texas counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Zapata (7.53), Deaf Smith (7.54), Moore (7.54), Gillespie (7.55), Randall (7.55), Sherman (7.55), Zavala (7.55), Hall (7.56).

The range in Texas runs from Hardin at 4.64 to Upton at 8.19; Lamb sits 82% of the way up.