Idea: Take some clay, form and burn a repository for nitrogen rich water, that can be reached by roots, but not by rainwater, bury them beneath the field, resup

Idea: Take some clay, form and burn a repository for nitrogen rich water, that can be reached by roots, but not by rainwater, bury them beneath the field, resupply it via a feed line. Now watch roots and heavy tractors ruin that brilliant plan.