International Rice Research Institute <br/><br/>
Efficiency of Nitrogen fertilizers for Rice 

 - Los Banos, Laguna, Phplippines  International Rice Research Institute  1987 
 -  p.260:ill.:map. 
<br/><br/><label>ISBN: </label>971104174x 
<br/><br/><label>Universal Decimal Class. No.: </label>633.18  / DOA