KnowraBiological nitrogen fixationLinked fromLinked fromThe 25 pages that link to Biological nitrogen fixation, each with the reason it gives.All 25Broader topic 2Related 15Narrower topic 6Compared with 2Nitrogen fixationBroader topic: It is the biological route that supplies fixed nitrogen to ecosystems.Alnus rubraBroader topic: Frankia bacteria perform this process inside red alder's root nodules.