Moving up the yield curve :  advances and obstacles : proceedings of a symposium / 
sponsored by Divisions S-4, S-8 and A-4 of the American Society ... 3-8 December 1978. 
 - Madison, Wisconsin :  American Society of Agronomy,  1980. 
 - 103 p. :  ill. ;  23 cm. 
 - ASA special publication ;  39 .
<br/><br/> 'Presented during the annual meeting in Chicago, Illinois, 3-8, December, 1978'. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0891180648 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop yields--Congresses.<br/>Agriculture--Congresses.