Role de la fertilisation dans l'intensification de la production agricole. 
 Role of fertilization in the intensification of agricultural production :  proceedings of the 9th Congress of the International Potash Institute, Antibes, 1970. 

 - Berne :  International Potash Institute,  [1970]. 
 - 489 p. 
<br/><br/> English, French & German text.  Cover title : Potassium symposium 1970. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers.