If you have tassels, it’s not pollination. And if your corn looks tall and green but lacks ears, it might be overcrowded, and your plantings are too thick. However, the yellowing that you mention, plus the lack of ears, does indeed suggest nitrogen deficiency. It’s hard for us to diagnose from afar, and you should call your local county extension services. In terms of a solution, there are mixed results on late-season nitrogen application for corn. If your corn already had a nice nitrogen application in fall/spring, and it’s the weather called some leaching, it may work. If the corn lacked nitrogen all along, it probably wouldn’t make up the yield. But you might as well try it. Here is a good reference from.
If you have tassels, it’s not pollination. And if your corn looks tall and green but lacks ears, it might be overcrowded, and your plantings are too thick. However, the yellowing that you mention, plus the lack of ears, does indeed suggest nitrogen deficiency. It’s hard for us to diagnose from afar, and you should call your local county extension services. In terms of a solution, there are mixed results on late-season nitrogen application for corn. If your corn already had a nice nitrogen application in fall/spring, and it’s the weather called some leaching, it may work. If the corn lacked nitrogen all along, it probably wouldn’t make up the yield. But you might as well try it. Here is a good reference from.