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17/12/2021 6:16 pm
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Which of the following is widely used as a successful biofertiliser in Indian rice field?
(a) Rhizobium
(b) Acacia arabica
(c) Acalypha indica
(d) Azolla pinnata
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17/12/2021 6:17 pm
Correct answer: (d) Azolla pinnata