Physiological aspects of crop yield / 
editorial committee, Jerry D. Eastin ... [et al.] 
 - Madison, Wis. :  American Society of Agronomy,  1969. 
 - 396 pages :  illustrations ;  24cm 
<br/><br/> Includes bibliographies 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant physiology--Congresses.<br/>Crop yields--Congresses.