I have had cheyenne bermuda planted for 3 years in the same field. This year, for the first time, I had chicken manure spread on it. All of a sudden I had a grass appear that has blades about 3/8 wide and dark green. It shoots up a seed pod that looks similar to bahia, but it is thinner. It is taking over in places quickly. The edges of the leaves are a redish-purple. I don't think it is johnson grass. Any body have any idea what this is and how to get rid of it?