Transition from extensive to intensive agriculture with fertilisers :  proceedings of the 7th Colloquim of the International Potash Insti tute held in Israel, 1969. 

 - Berne, Switzerland  ,  1969. 
 - 282 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers and manures--Congresses.
<br/><br/><label>Dewey Class. No.: </label>631.81