I won't call anybody un-American. But the farmer's retort is sensible. Yes, they are taking advantage of high corn prices, farming every inch of ground, stalks and all. But they're doing it so they can survive the down times, which are far more frequent than the good times. The last few years have been an anomaly with commodity prices. It would be unfair, at this point, to accuse them of raping the land with greedy grins. They know ag could go down the drain again, and they're strengthening their balance sheets in the meantime.
On the other hand - we just want to hunt pheasants!
Here's one thing that has proven to be successful: make the farmer who's land you hunt an extra pie this year, and ask him to leave you a little more pheasant cover - a couple of rows or whatever (and that can be done even with the new-fangled combines). Sometimes an appeal to the belly speaks more than anything. But the point is - if there is at least a little more cover - a row or two - it will help keep the pheasants around.
Get to know the farmers. Make it point to sit early mornings in the coffee shops, shoot the breeze with them, and let them get to know who you are in the community. Then get them alone sometime, and just talk about the issue. I've found that most farmers like seeing the birds there, and there's usually some minor sacrifices they are willing to make to accommodate that.