Nitrogen.
They have molydenum, folate, dietary fiber, tryptophan, magnese, of course protein, phosphorus, vitamin B1, magnesium, potassium, iron, and not a very significant amount of calories...
In gererally all plants need these nutrients including beans: Carbon Oxyogen Hydrogen Nitrogen Sulfur Phosphorus Potassium Calcium Magnesium
Of course!
same as any other plant