Best Cover Crop (WR/Clover) for poor soil

Gord said he's all out from BLK buying everything but he said 11-12 per pound. I found a place in south Dakota at 10 per pound
 
Let me know how it works. I have read that Falcata alfalfa has tremendous longevity. Alfalfa needs a higher pH and can not be overseeded into an existing alfalfa plot after 1 year because of autoxicity. Good luck.
 
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