Ann,
It's true, any grass will absorb that N. Legumes will do it too. All
legumes will stop feeding the rhizobial colonies and they'll be dormant.
The plant invests 25-30% of it's photosynthate to feed these bacteria
when N isn't present in sufficient quantities for the plant.
But legumes are not altruistic. They'll stop feeding them and absorb N
from the soil- a much more efficient way for the plant to produce
biomass. I'm sure that some plants absorb N faster than others- that's
what you need to look for rather than a non-symbiotic legume. I'm
guessing that seed for such a creature is far more expensive than a more
common plant.
Alex
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