Nitrogen and the environment is in the news again. The truth is that we can have more than enough Nitrogen to grow even higher yielding crops, provided it is organically bound. That means that farming either has to find organic sources of N (not always available and likely to be expensive), or make them. The way to make them is potentially both safe and profitable.
The one great blessing of the expanding numbers and wealth of the human race is that that expansion is mirrored by an increase in urban and industrial wastes. Most of that waste can, despite the reticence of the regulators, be safely recycled to land. To do so not only solves the waste recycling problem, it can and will grow better crops with higher yield, with less cultivation energy, less crop disease, and dramatically less Nitrogen run-off.
How do we know that? Because it has been done. Search; How to make on-farm composting work
Land Research Ltd 13 March 17