When it comes to managing soil health, it’s common to focus on the big three nutrients (nitrogen, phosphorus, and potassium) and overlook a fourth key aspect: soil pH. Soil pH refers to how acidic (sour) or alkaline (sweet) soil is on a scale between 0 and 14, with 7.0 being neutral. Most plants and crops prefer soil pH levels in the 6.0–7.0 range.