Ritchey, K. Dale. <br/><br/>
Potassium fertility in oxisols and ultisols of the humid tropics 

 - Ithaca, New York :  State College of Agriuclture and Life Sciences,  1979 
 - 44 p.  ; gráfs. 
 - Cornell International Agriculture. Bulletin  ; 37 .
 - Cornell International Agriculture Bulletin  ; 37 .
<br/><br/><label>LCCN: </label>48788 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizantes potásicos.<br/>Potasio--Efecto en plantas.<br/>Suelos tropicales.