Bob seeded alfalfa with a nurse crop of oats on Aug 14th. It only took a few days, thanks to rain, for the crop to emerge. You can see the difference a few days makes in the photos below.
Why the oats? Grasses provide better snow catch and insulation than alfalfa stubble alone, so alfalfa crowns are better protected from winter injury. See more here: http://www.extension.umn.edu/agriculture/dairy/forages/seeding-grasses-with-alfalfa/
These photos were taken just a few days apart.