We have a field of alfalfa that's about 4 acres. This is the third year since we planted it. Pigweeds are showing up and are pretty thick. I'm looking for some advice on how to get rid of them or at least something we can spray on them to kill them. Round up will not kill them. BTW the alfalfa has been incredible for a food source, antler growth and a great place to hunt in the afternoon. Not to mention the turkeys stay out there on a daily basis. Any advice would be much appreciated!