Editing Root nodule (section)

===Leguminous family===
Plants that contribute to N2 fixation include the [[legume]] family&nbsp;– [[Fabaceae]]&nbsp;– with taxa such as [[kudzu]], [[clover]]s, [[soybean]]s, [[alfalfa]], [[lupin]]es, [[peanut]]s, and [[rooibos]]. They contain [[symbiosis|symbiotic]] bacteria called [[rhizobia]] within the nodules, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants, and this helps to fertilize the [[soil]].<ref name="postgate">{{cite book |last1=Postgate |first1=John |title=Nitrogen Fixation |publisher=Cambridge University Press |year=1998 |isbn=9780521648530 |edition=3rd |location=Cambridge UK}}</ref><ref>{{Cite book |last1=Smil |first1=Vaclav |title=Cycles of Life: Civilization and the Biosphere |publisher=Scientific American Library |year=2000 |isbn=9780716750796 |language=en}}</ref> The great majority of legumes have this association, but a few genera (e.g., ''[[Styphnolobium]]'') do not. In many traditional farming practices, fields are rotated through various types of crops, which usually includes one consisting mainly or entirely of a leguminous crop such as clover, in order to take advantage of this.{{cn|date=March 2025}}