I think those pictures are photoshopped. I'm not a farmer, but I've been studying up on planting food plots on this website and you're supposed to throw out the seed and then mow the grass over the top of it. The seeds aren't supposed to be planted in straight lines.
If you cut the field with a disk, then all your topsoil washed away when it rained on it.
Seriously, they look great. Before I planted alfalfa on my big plot, it looked like yours in the summer.