There are a couple of subtle things to notice in this image. The first is that the corn stalks are just beginning to dry and turn brown at the bottom. This process should proceed pretty rapidly over the next few weeks. Second, is the shadow from our hackberry tree. I've taken most of the corn photos at 9 AM on Sunday morning, and if you compare the shadow in this image to some of the earlier ones, you'll observe that the sun is much lower in the sky in late August than it was in June. By comparing all the photos, you can see the steady progression of the position of the sun at this time of the morning.