12/01/2025
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There's nothing quite like pulling a legume out of the ground and seeing it just loaded with nodules. π±
Those small bumps on legume roots are where rhizobia bacteria colonize and get to work.
Inside these nodules, the bacteria convert atmospheric nitrogen into ammonia, a form plants can actually use. In return, the legumes supply the bacteria with energy from photosynthesis.
This partnership means legumes can grow without pulling nitrogen from your soil.
Instead, they add it back.
When those cover crops break down, that fixed nitrogen becomes available for your next cash crop.
Healthy nodules should be pink or reddish inside. That's the active nitrogen fixation. If they're white or green, the process isn't happening effectively.
Want to make sure your legumes are fixing nitrogen? Check those roots. The nodules don't lie!
Thanks to Glen Massoth for the great photo!