I don't know crap about current grain production; however, I am a master gardener, and it has been my experience that most people, and I include farmers, over fertilize. Historically, farmers didn't always pour fertilizer every year. But they do so now to increase production per acre.
City dwellers put too much on their lawns. Just to have more green and a reason to ride their big boss lawn "tractors" over a 1/4 acre suburban front yard every week end.
What I am suggesting is that a reduction in lbs per acre for one or two seasons may well prove lower yields per acre but, that does not mean they will go broke or that we are gonna starve. In truth, every farmer knows, or at least complains, that we produce more than we need which actually reduces their income per bushel as it is.
Frankly, our rivers and streams get far too much of the stuff every year. They too could use a rest.
Not trying to be indifferent. Farming is a tough business. I've been there. What I remember most about agriculture is that farmers have something about which to complain most every year.
But the bright side ain't too bad here. Let's try not to make it more than it is. After all, that is the job of our politicians.