Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer?
Correct answer: D. Azolla pinnata
- A. Cyanobacteria
- B. legume-Rhizobium symbiosis
- C. Mycorrhiza
- D. Azolla pinnata
Explanation
Azolla plays a very important role in rice production. Azolla and its nitrogen-fixing partner, Anabaena, have been used as green manure to fertilize rice paddies and increase production. With the help of Azolla, rice can be grown year after year, several crops a year, with little or no decline in productivity; hence no rotation of crops is necessary.
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