Potassium symposium 

 - Switzerland  International potash institute  1955 
 - xxiii,613p.  23cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Specific techniques<br/>Agriculture and related technologies<br/>Fertilizers,soil conditioners,growth regulators<br/>Potassium fertilizers
<br/><br/><label>Dewey Class. No.: </label>631.83  / POT