As far as thunderstorms go the only data I have heard of claims New England gets about 0.5 lb N per K per year. The prof who gave this data said a good study for a Masters degree would be to do this in Florida. Florida is the Lightning capital of the USA.
Nitrogen Fixation by legumes is one of the big N sources. As a kid I lived in Penna. and my daddy planted Clover to help keep the lawn green. Do people still do this??? What is a legume and how does it make N ????
it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.
You can lead a Donkey to water but you can't make the Jackass Drink