mention the two role of nitrogen fixing bacteria in soil
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The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
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Plants cannot take nitrogen directly from atmosphere. So nitrogen fixing bacteria such as rizobium and azetobectar convert atmospheric nitrogen into water soluble form (nitrates) which is then taken up by plants
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