alt Hacker NewsRhizobacteria are not known to colonize the roots of cereal crops, typically only only legumes. You would think that scientists would spend more effort trying to create "super" rhizobacteria that can colonize even more aggressively and also fix many times more nitrogen than ordinary ones. I cannot say this one below has independent reviews by well published agroscientists, but it's a step in the right direction:
https://soilscapesolutions.com/products/RhizoGenesis-p668356...
Do a Google search: Methods for Breeding "Super Strains"
Chemical Mutagenesis: Scientists expose the rhizobacteria to alkylating agents like Ethyl methanesulfonate (EMS) to force point mutations.
Physical Radiation: Exposing bacterial cultures to UV light or gamma rays breaks DNA strands, inducing random repair variations.
Experimental Evolution: Google it.
Replies
There are also “free living” bacteria that are capable of nitrogen fixing (diazotrophic), but are not as strictly root dwelling like Rhizobia. https://en.wikipedia.org/wiki/Paenibacillus
My company, Wilbur-Ellis, sells “Nutrio N-Tune” (https://www.cdms.net/ldat/ldJI1000.pdf) which contains spores of Paenibacillus Azotofixans.
Compared to the more well known legume colonizing Rhizobia bacteria, they can host on a wide variety of plant families. Our Paenibacillus Azotofixans can be applied to soil even before a crop is planted and does not need to be directly inoculate seed (though you can do so).
They also don’t seem to have their nitrogen fixing ability suppressed by nitrogen presence, so you can apply both them and fertilizer.
I’m told that under ideal conditions, their presence can behave like adding up to 0.5 pounds of nitrogen an acre per day. While they can’t certainly can’t replace fertilizer applications, that is an impressive amount, especially since it’s a constant source rather than whenever a grower can get around to putting something out.
> You would think that scientists would spend more effort trying to create "super" rhizobacteria that can colonize even more aggressively and also fix many times more nitrogen than ordinary ones
I think the problem with that idea is that the rhizobacteria needs energy to break the nitrogen tripple bond. A lot of energy. It gets that energy by getting carbohydrates from the host plant - which in turn are not available to the plant to grow.
I'm sure there's plants where not fertilizing with nitrogen at all would make the trade-off worth it, but the vast majority of our optimized crops can't spare double-digit percentage points of their total yield to feed bacteria. You're much better of just using natural gas (or green hydrogen) to fix the nitrogen.