Physiological aspects of crop productivity :  proceedings of the 15th Colloquium of the International Potash Institute held in Wageningen/The Netherlands, 1980. 

 - Worblaufen-Bern, Switzerland :  International Potash Institute,  1980. 
 - 274 p. :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crops--Physiology<br/>Crop yields
<br/><br/><label>LC Class. No.: </label>SB112.5  / .I58 1980 
<br/><br/><label>Dewey Class. No.: </label>631/.015811�19