Soil pH determines how soil ranges from acid to neutral to alkaline. This characteristic is given a pH number. Soil with a pH of seven is neutral. Levels below seven are considered acidic and those above seven are considered alkaline. If a soil’s pH level is extreme in either direction, plants in that soil are not getting the nutrients they need to grow properly.
Soil pH levels are important because they can affect how well your lawn grows. A soil’s pH level affects plant growth in several ways:
Nutrient availability
Soil bacteria
Nutrient leaching
Soil structure
Soil toxicity