what is the optimum ph level for a good lawn?
Check out this page for a simple soil content test. The soil's pH rating is also important. This rating tells you the relative acidity and alkalinity of the soil (this page explains the concept). The ideal pH level is around 6.5 or 7, but levels vary between different grass species and climate conditions. You can find out your soil's pH level with a home test or a professional test. If you need to substantially increase the acid level, add sulfur.