We are located in southeast Michigan. We currently cut grass and landscape. I am thinking about the benifits of also offering fert as a service rather than subbing it out like we do now. I was wondering if some of you pro's could point me in the right direction. How do you get started? Whare do you get the books to read up? Whare do you get the tests to take? What do you look for in Labor? Any ideas or tips would help alot...Thanks!