Changing patterns in fertiliser use :  proceedings of a symposium sponsored by the Soil Science Society of America and held at the Palmer House in Chicago, Illinois, february 14 and 15, 1968/ 
edited by L. B. Nelson and others. 
 - Madison, Wis., :  Soil Science Society of America,  1968. 
 - xiv, 466 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilisers and manures--Congresses.
<br/><br/><label>Dewey Class. No.: </label>631.8