You know that jogs my memeory. I saw a book listed that could help you diagnose soil issues based upon the kind of weeds that grow there, and various crop symptoms.
I can’t remember where I saw it, and I didn’t bookmark it. Maybe as you are researching, you will come across it.
I think it was Diana that posted this link a couple or so years ago.
http://customers.hbci.com/~wenonah/min-def/list.htm
114 Color Pictures of Mineral Deficiencies in Plants from The Diagnosis of Mineral Deficiencies in Plants by Visual Symptoms