I missed seeing this thread until today.
I am going to take it back to basics for a second or two. The type of soil and It's Chemical holding power should have a bearing on your selection of a Fertilizing program. Slow release liquid Fert is no good on sandy soil. It runs through before it can used and only pollutes the water table. Clay Soil it has a better chance of being used if it doesn't run off.
I am not going to bring out the SOIL SAMPLE Flag because I haven't pulled a soil sample in Years. But I know what my soil is and has or doesn't have that I need to add. I am sure my Fert program wouldn't work in other areas as good as it does in my area.
You can lead a Donkey to water but you can't make the Jackass Drink
"As Americans you have the right to be stupid." John Kerry
"Life is tough, but it's tougher when you're stupid.” John Wayne.