Supplementing nitrogen comes with a whole host of environmental trade-offs. In particular there are problems with pollution, where nitrogen added to fields gets

Supplementing nitrogen comes with a whole host of environmental trade-offs. In particular there are problems with pollution, where nitrogen added to fields gets washed off in the rain and ends up in waterways. There it can totally destabilise ecosystems by introducing a flood of nitrogen which is usually a scarce resource, leading to massive population explosions of some kinds of organisms, which in turn can leave huge buildups of toxic byproducts. This is called eutrophication. https://en.wikipedia.org/wiki/Eutrophication https://en.wikipedia.org/wiki/Eutrophication