Tamilnadu BoardEnglish MediumSTD 12BIO BOTANYPlant Breeding.3 Marks
Question
Azolla increases the yield of paddy crop – support your answer.
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Answer
Azolla is a free-floating water fern that fixes the atmospheric nitrogen in association with nitrogen-fixing blue-green alga Anabaena Azolla. It is used as a bio-fertilizer for wetland rice cultivation and is known to contribute 40 – 60 kg/ha/crop. The agronomic potential of Azolla is quite significant particularly for increasing the yield of rice crop, as it quickly decomposes in the soil.
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