The Soil quality is a big factor.
Because Florida's Gulf Coast is below Flood Plain, our house are built on Fill dirt. Fact is the canals were dug to reclaim water front property. Dirt out of the canal was used to raise the land above the Flood Plain. However even more fill dirt has to be brought in before building.
These houses are build at different times and by different contractors who got fill dirt from different sources. As a result we have yards that get very little care and look beautiful. We also have yards that get everything and look horrible. These yards are next door to each other.
I also agree Cultural Practices must be carried out properly or all the Chemicals in the world won't do any good. Because water is so expensive and our soil is so sandy, many people under water. Truth be told, Water is the biggest factor in growing grass.
it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.
You can lead a Donkey to water but you can't make the Jackass Drink