Robert K.M. Hay <br/><br/>
Physiology of Crop Yield 

 - 2nd Ed 
 - Oxford  Blackwell Publishing Company  2006 
 - 314p 
<br/><br/>Robert K.M. Hay & John R. Porter: Physiology of Crop Yield.  (2nd Ed)  Oxford.  Blackwell Publishing Company, 2006. 1-4051-0859-2--(581.1HAY)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>1-4051-0859-2 
<br/><br/><label>Dewey Class. No.: </label>581.1  / HAY