Interesting. We use lots of alfalfa, with some tame pastures 75%+Alfalfa. We usually seed with a Case IH 6200 press drill on 6" centres and put it in 1/4" deep. Depending on our target we usually try to hit about 5# per acre seeding rate. Rain makes it grow, and patience makes it rain (eventually). We also pack it good before we seed to ensure that the seed depth is controlled. We have some stands that are over 30 years old and still contain tremendous amounts of alfalfa (including the old yellow Anik varieties. We keep it in the stand by rapid grazing and then moving the cattle off. Not for everyone, but it is basically the same idea as haying it. we don't leave cattle on it for extended periods of time. Average yield on the old stands is around 75 cow days per acre dryland. In a year like this one, we can top 100. We try to get narrow row spacings and are going to experiment with adding sainfoin to the mixture as well. We will often throw common alfalfa into the drill for our annual crop acres when we seed.
Bloat is a non issue here, but we don't buy a lot of cattle in and our cowherd is pretty adapted, so we rarely follow any of the recommendations about putting cattle into alfalfa or moving them at certain times of the day.
I know it likes cool weather, so it would be interesting to see how it does further south. It does make fantastic hay in a mixed stand.