nitrogen fixing, rhizhomal, and deep tap roots for the alkaline desert, whats not to love ?
The best graze you can get for animals. The Brit site says it should be sown with grass to get the sugar balance for silage.
Possibly a dewormer too...
https://permies.com/t/23727/goats/Common-Sainfoin-pasture-worms#190878
This has been talked about as green ground covers, and a Sepp favorite, so here is a list sites to get you started.
http://en.wikipedia.org/wiki/Onobrychis_viciifolia
For sale
http://www.sainfoinseed.net/
USDA sheet
http://www.plant-materials.nrcs.usda.gov/pubs/idpmcpg7792.pdf
range forage sheet
http://www.animalrangeextension.montana.edu/articles/Forage/Species/Legumes/Sainfoin.htm
Brit Site
https://www.cotswoldseeds.com/seed-info/growing-sainfoin
