What is the best corrective action for a soil pH of 5.1 in a tall fescue lawn?

What is the best corrective action for a soil pH of 5.1 in a tall fescue lawn?

• A. Apply lime
• B. Apply sulfur
• C. Water deeply
• D. Aerate the soil

Answer: (A)

Raise the soil pH toward the preferred range for tall fescue by applying lime. At pH 5.1, the lawn is quite acidic, which can limit the availability of essential nutrients like calcium, magnesium, and phosphorus and can increase the risk of aluminum and manganese toxicity affecting root growth. Lime neutralizes acidity and supplies base cations (calcium, and magnesium if using dolomitic lime), helping nutrients become available again and improving overall turf health. The amount of lime needed depends on your soil test results and soil’s buffering capacity, and it should be applied and incorporated according to the test recommendations. After lime is applied, expect changes to occur gradually over months, so recheck the pH later and adjust as needed. The other options don’t correct the pH toward the desired range: sulfur would lower pH further, making the acidity worse; watering deeply helps with moisture and nutrient movement but doesn’t change pH; aerating improves root growth and soil structure but has little lasting effect on pH.

Raise the soil pH toward the preferred range for tall fescue by applying lime. At pH 5.1, the lawn is quite acidic, which can limit the availability of essential nutrients like calcium, magnesium, and phosphorus and can increase the risk of aluminum and manganese toxicity affecting root growth. Lime neutralizes acidity and supplies base cations (calcium, and magnesium if using dolomitic lime), helping nutrients become available again and improving overall turf health. The amount of lime needed depends on your soil test results and soil’s buffering capacity, and it should be applied and incorporated according to the test recommendations. After lime is applied, expect changes to occur gradually over months, so recheck the pH later and adjust as needed.

The other options don’t correct the pH toward the desired range: sulfur would lower pH further, making the acidity worse; watering deeply helps with moisture and nutrient movement but doesn’t change pH; aerating improves root growth and soil structure but has little lasting effect on pH.