How azolla help rice?

Azolla is a floating aquatic fern that helps rice cultivation by enhancing soil fertility through nitrogen fixation. It forms a symbiotic relationship with cyanobacteria, which convert atmospheric nitrogen into a form that plants can use. When incorporated into rice fields, Azolla can improve soil nutrient levels, reduce the need for synthetic fertilizers, and suppress weed growth. Additionally, it can enhance water retention in soil, contributing to better rice yields.