Hey bro, if you know so much about dinitrogen and nitrogen fixation, I'm confident you can research the nutrient content in the dry matter of plants on your own!Dinitrogen is elemental nitrogen gas. It cannot be part of analyzable N.
But I am intrigued by your claim of 20 000 ppm (two per cent!) analyzable N. I'd appreciate a more direct link than "google the nitrogen cycle". cn
Oxygen, hydrogen and carbon make up about 90% of the dried matter, nitrogen is the next highest element content.