Lime raises pH.

Your coop probably wants the pH up to 7.0 to grow alfalfa. If you don't want to spend the money on lime, plant clover. It will do well in 6.4 pH as long as the soil will hold a little moisture.

Just for kicks, what was the Phosphorus and Potash levels. You'll need to address them with the correct fertilizer. I wouldGUESS about 300 pounds of 6-24-24 per acre should work fine.

As far as a genetic selection for low pH or high pH alfalfa. I don't think it exists.

My suggestion on clover would be a ladino like the Imperial Whitetail blend. I've had good luck with it in a soil pH of 6.3.

Hey, with the money you save on lime, the seed cost will be basically free.

POP