Question

For nitrogen fixation is soil we May use

Answer 1

Rhizobium bacteria can be used

✌@skb

Answer 2

They  has  symbiotic  bacteria  which is  known as the  rhizoid  with the   presence of the  nodules  in the  part of the root  and it producing  start to product the  nitrogen  compound  which assist  for the   grow  of plan.  

If the  plant dies  then you need to  fixed  nitrogen  which is released  and making  it available  to  other sort of the plant which  improve the fertilize  the soil.