Documents 1 Nitrogen Cycle Most of Nitrogen is in the atmosphere. 14 N = 99.6% 15 N = 0.4% Air is standard for...

Slide 1 1 Nitrogen Cycle Most of Nitrogen is in the atmosphere. 14 N = 99.6% 15 N = 0.4% Air is standard for  15 N Range is –20 to +20 ‰ Slide 2 2 Assimilation and…