Potassium in tropical crops and soils/  
10ª Colloque od the International Potash Intstute 
 - Suiza :   International Potash Intstute,   1974 
 - 603 p 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ABONOS DE POTASIO<br/>ABONOS Y FERTILIZANTES
<br/><br/><label>Dewey Class. No.: </label>631.86 C719