You can also get a hint about micronutrient deficiencies (and macro- ones as well) just by looking at the grass plants. For sure, a tissue test helps you to narrow down the problem and make sure that you're not wasting any money or time.
Just out of curiosity, what do you guys on this board do for soil and/or tissue testing? When do you soil test and why? Do you ever need to tissue test? Why?
I think my "system" has worked pretty well, but I want to know if maybe you guys have anything better.