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    Question

    If azolla is grown in rice field along with rice crop,

    then how much nitrogen is fixed byazolla in rice field ?
    A 10-20 kgN/ha Correct Answer Incorrect Answer
    B 20-30 kgN/ha Correct Answer Incorrect Answer
    C >50kgN/ha Correct Answer Incorrect Answer
    D 30-40 kgN/ha Correct Answer Incorrect Answer

    Solution

    Azolla is a free floating water fern which is in symbiotic association with Anabaena azollae   fixes 40-60 kg N/ha in rice fiels

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