Are you having problems? Yellowing even after monthly fertilizing? I ask because here in Texas our pH is 8.0 and that extends for hundreds of miles in all directions and 1,000 feet deep. We live on limestone beds. There is no amount of any product we can apply to lower our pH, but the grass does just fine.

The lawn is thinning in spots and there is some yellowing. I think that there may not be enough sunlight in some of those thinning places but read in some manual that due to the high PH that some of the nutrients in the fertilizer might not be utilized properly. The ideal PH in this area seems to be mid 6.