Petr,J. <br/><br/>
Yield formation in the main field crops . 
J Petr 
 - New York   Elsevier Science  1988 
<br/><br/><label>ISBN: </label>0444989544 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1.Field Crops 2.Crop Yields
<br/><br/><label>LC Class. No.: </label>SB 185 .P47