The numbers psandhu is referring to - is that .......all else being equal....... fertilizer is acidic - and that as you add fertilizer to your soil - you need to compensate for the acidic effects - and lime accordingly. The rate might be right, I'm not sure - but it sounds feasible.

6.5-6.9 are super numbers - I grow beans & corn on PH of 6.0 - maybe even a little less!

FH