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
Answer:D
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