* It is also known as composite fixation of nitrogen
* It is also known as free fixation of nitrogen
* It is also known as free fixation of nitrogen fixed by Rhizobium bacteria
* It is also known as nitrogen gain through rains or snow
* It is also known as free fixation of nitrogen
* It is also known as free fixation of nitrogen fixed by Rhizobium bacteria
* It is also known as nitrogen gain through rains or snow