I love Solu-Cal, but it is like a drug, once you start using it you cannot stop. It is short lived, and when you read the bag it will tell you about a maintenance plan to follow. I don't fully understand the science, and rely on more educated people to convince me, but it does seem to have an effect on my properties. A sport field, Bermuda grass I know of seemed to fair better than a field that was not treated.
Not helpful I know, but thought I would offer 2 cents.
Elite Pest & Lawn Solutions