How chemicals actually accomplish the job is the critical bit of information that creates a professional. Following directions on the label ensures the most amount of product used for least amount of result.
Why do you think there are split apps for pre-m now days? Why is it always mixed with the NPK for HOs.?
People should have an understanding of what they are dealing with, but the licensing system doesn't teach you anything except "Read the Label".
Run your business as though you are a very astute HO...