Soil pH in Winn, LA: Lime or Sulfur?
Typical topsoil pH in Winn, LA
Typical topsoil in Winn, LA is pH 5.16, too acidic for vegetable garden. Expect roughly 9.1 lb of lime per 100 sq ft, but only after a soil test confirms it.
What Winn needs, by plant
- Already in range: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.
- Lime: lawn (cool-season grass) 9.1 lb/100 sq ft over 2 applications; vegetable garden 9.1 lb/100 sq ft over 2 applications; tomatoes 9.1 lb/100 sq ft over 2 applications; strawberries 5.6 lb/100 sq ft over 2 applications; roses 9.1 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 5.16, spread about 91 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 534,526 surveyed acres in Winn, LA, 92% are strongly acidic (below 5.5), 7% are moderately acidic (5.5-6.5), 2% are near neutral (6.5-7.3). Mapped soils run from pH 4.6 to 8, a spread of 3.4 units across 55 soil components. 92% 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 14% clay and 1.97% 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. 1% of mapped components carry free carbonate (lime already in the ground).
Winn against the rest of Louisiana
pH 5.16 is 0.38 below the Louisiana median of 5.54. 3 of 64 Louisiana counties have more acidic topsoil. Nationally it is more acidic than the US county median of 6.05.
Closest in pH within the state: Allen (4.88), Washington (5.01), Beauregard (5.13), Sabine (5.2), St. Tammany (5.21), Jackson (5.22), St. Helena (5.22).
The range in Louisiana runs from Allen at 4.88 to St. Bernard at 7; Winn sits 13% of the way up.