Hello all. I planted my first 2 acres of alfalfa this year. I used roundup ready seed. No cover crop. My question is when should you spray the roundup. The feild is almost 100% green, no dirt showing. Was thinking this woud be the time so the alfalfa would keep out any new weeds since the gournd is completly covered. I am in Eastern Nebraska if that makes a difference. Look forward to any advise.