Porter John R <br/><br/>
The physiology of crop yield 

 - 2nd ed 
 - oxford  Blackwell publishing  2006 
 - 314p 
<br/><br/><label>ISBN: </label>978140510859 1 
<br/><br/><label>LC Class. No.: </label>SB 112.5  / .H39 2006