Nitrogen fixation in crops
Some common edible legumes, such as (a) peanuts, (b) beans, and (c) chickpeas, are able to interact symbiotically with soil bacteria that fix nitrogen.
Source
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"OpenStax College, Nutritional Adaptations of Plants. October 17, 2013."
http://cnx.org/content/m44718/latest/Figure_31_03_01abc.png
OpenStax CNX
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