Symbiotic N-fixers

  • Symbiotic and non-symbiotic microorganisms can fix atmospheric N2 gas into organic N forms
  • The best known N-fixers are: symbiotic Rhizobia (legume bacteria), non-symbiotic free-living bacteria such as Azotobacter and Clostridium, and blue-green algae.
  • Rhizobacteria or Rhizobia includes the genus Rhizobium, Bradyrhizobium, Sinorhizobium, and Mesorhizobium.
  • Method of application:For seed treatment Rhizobium @ 200 g for 10 kg of seed is recommended for pigeonpea, green gram, black gram, cowpea, groundnut, and soybean.A 10% jaggery (gur) solution is used as a sticker. For soil application, 2-3 kg Rhizobium is mixed with 40-60 kg manure/soil and applied in 1 acre.