There is a lot we can tell you about soil ph but it would be best if you take a little time to read our SOIL PH article which summarizes most everything you need to know. The bottom line is you need to check this measurement at least twice a year and adjust it as needed. Before we recommend anything else, it's vital you get your lawn measured with a SOIL METER to see if it's Ok. From there we'll be able to further advise.

Testing your lawn soil ph should be done at least twice a year. Since the ph is always changing, it's important that you monitor it's measurement so you can make adjustments when needed. If the soil ph rises above 7.0 or below 6.0, you'll start to have ramifications. Fortunately being able to get a soil measurement has never been easier. The newest Soil Test Probes enable you to get fairly accurate readings from your lawn and garden instantly. We recommend you measure your lawn soil ph by taking measurements for every 200 sq/ft. You should do this at least every 6 months; every quarter if the soil has a history of changing over time. More information about the importance of lawn ph levels can be found in our Soil PH article.