I have been mowing and landscaping for sometime now, and have recently decided to expand and begin fertilizing and spraying lawns. I have some residential jobs but the commercial jobs that I have is what scares me the most, like the largest banks and businesses in my city. I have until the early spring to learn all I can about it. What would be recommended for me to learn the correct amounts of this to be mixed with this, and so on? I know too much of certain stuff will burn grass. I have thought about going to a different city or state and give of my time to a company that does fertilize and spray chemicals all the time. Hey, what better way to learn than by experience. I would appreciate any help that could be given. Thanks, lawnsnake!