Almost pure alfalfa in that spot, field is variable.  Got seeded last year, then 3-4" of rain on it, then 90+ for a week after it germinated.  Ended up with a poor stand, no tilled more into in the summer, first cutting wasn't very good, that was second cutting and it finally came to life.  Did around 4 16-1700 lb dry bales/ac second cutting.  First cutting this year was less then one bale/acre.