Which of the following pair of nitrogen fixing bacteria and crop is not correctly matched ........

Assam Geography and Environment

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Which of the following pair of nitrogen fixing bacteria and crop is not correctly matched?

Blue green algae -- paddy

Rhizobium -- Pea

Azetobector -- Wheat

Azolla -- Maize

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Explanation:

Nitrogen is the single most limiting factor in rice cultivation, strongly affecting the crop yield. Azolla substantially increases the amount of nitrogen fertilizer available to growing rice and it is has been used for thousands of years as a ‘green’ nitrogen fertilizer to increase rice production.