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    				| 1. | Question : Azolla increases the yield of paddy crop - support your answer. | 
| Answer» Solution :Azolla is a free-flower WATER fern that fixes the ATMOSPHERIC nitrogen in association with nitrogen in association with fixing blue green alga Anabaena azolla. It is USED as abio-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 YEILD of rice crop, as it quickly decompose in soil. | |