Dutta, S K . <br/><br/>
Biological nitrogen fixation associated with rice production /  
NULL. 
 - New Delhi :   Oxford and IBH Publishing ,   1991. 
 - 448p. :   table,fig. ;   25cm .  
<br/><br/>NULL 
<br/><br/><label>ISBN: </label>8120405609  Rs. 395.00