Those of you that claim plant growth is nitrogen limited have not spent enough years working in an orchard. An observant orchardist will tell you the trees on t

Those of you that claim plant growth is nitrogen limited have not spent enough years working in an orchard. An observant orchardist will tell you the trees on the outside of the orchard always grow the most given like conditions (soil, water, etc...). How would a lowly orchardist know this when an environmentalist doesn't? The orchardist prunes the trees and knows there is significantly more pruning required on the outside edge of an orchard. Could that related to substances other than CO2? Yes. But the fact remains there is a higher concentration of CO2 on the outside edge of an orchard than the inside.