how is nitrogen made available to plant
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Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants. Legumes (such as clover and lupins) are often grown by farmers because they have nodules on their roots that contain nitrogen-fixing bacteria.
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Explanation:
some bacteria present in soil like Rhizobium fix atmospheric nitrogen into soil in form of nitrates and nitrites.Then this nitrates and nitrites are used by plants
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