twisty baby dwarf locust as a nitrogen fixer

Most people seem to like the honey locust as a nitrogen fixer. We aren't interested in the pods for animals or our consumption. We'd be planting locust beside apple and pear trees as a nitrogen fixer. I like the idea of a shorter locust tree so that it doesn't shade our semi-dwarf Apple and Pear trees. So, I got curious when I found this short locust tree...

http://www.starkbros.com/products/landscape-trees/flowering-trees/twisty-baby-locust

Would it add nitrogen comparable to that of a younger honey locust?

-Tom

Hey, Tom. I'm on my mobile so maybe I missed it, but I'm not seeing a species (latin) name on the Stark site. Without that, it's hard or impossible to research whether your locust of interest is a nitrogen fixer.

Apparently not all leguminous trees fix nitrogen. Honey locust is the subject of much debate and discussion and uncertainty; it's (by most reports) not a nodulating tree and the research on whether it fixed nitrogen is mixed. At least one study found some fixing, but the mechanism (without nodules) is unknown, uncertain, or speculative.

Best I can suggest is ask Stark for a species name (if they know it) and then do some Googling to see if that species is known to fix nitrogen. Look for actual studies, not just long lists of leguminous trees presumed to be nitrogen-fixers because they are leguminous. Sadly it's not that easy.

Elsewhere, I found...
Other name = Lace Lady cultivar
Patent = U.S.P.P. #9771
Botanical Name: Robinia pseudoacacia
Botanical Pronunciation: roh-BIN-i-a sew-doh-a-KAY-see-a
Other name = Lace Lady cultivar
Other name = Dwarf Black Locust

Black locust is a nitrogen fixer. You should be set!

Unfortunately they are out. I signed up for an email for when they are in Stock. I will look around for other sources, I am planting nitro fixers in between my fruit trees too, having trouble finding them.