Craswell, E. T. <br/><br/>
Recent developments in research on nitrogen fertilizers for rice / 
E.T. Craswell and S.K. De Datta. 
 - Manila :  International Rice Research Institute,  1980 
 - 11 p. :  ill. 
 - IRRI research paper series ;  no. 49 .
<br/><br/> Cover title. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen fertilizers.<br/>Rice--Fertilizers.