If a soil has a pH around 6.5–7.0 for many grasses, what is likely true about lime application?

• A. pH around 4.5
• B. pH around 6.5–7.0; lime not typically needed
• C. pH around 5.0
• D. pH around 8.0

Answer: (B)

Grasses grow best when soil pH is near neutral, typically around 6.5 to 7.0. Lime is used to raise soil pH when it’s too acidic, but if the pH is already in that 6.5–7.0 range, adding lime won’t improve growth and can even reduce the availability of some micronutrients like iron and manganese. So, in this situation, lime application is not typically needed. Lime would be considered only if soil tests show a pH well below the optimal range (often below about 6.0 for many grasses).