Intentionally misleading title because we think of plants changing color as they mature. But yellowing leaves in soybeans are actually the result of various mineral deficiencies in the soil. I met a farmer, suspicious of my activities, while photographing one such field on Labor Day in Renville County. After talking for a while, I mentioned that I've been photographing farms for a few years and that I may not have been out at the right time to notice before. He just shrugged and said, "Yep... And pretty soon the leaves 'il dry up 'n fall off..."