Yes, Azolla is a water fern that lives with Anabaena algae, fixing nitrogen for rice like a free fertilizer. In my studies, I see it works in theory, but my appa's fields taught me it falters without perfect, constant water—a luxury we rarely had. So while books call it a miracle, I've held the wilted Azolla in my palm after a dry spell, knowing we still bought urea from town.
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