Mengel, Konrad. <br/><br/>
Principles of plant nutrition / 
Konrad Mengel, Ernest A. Kirkby. 
 - 2nd ed. 
 - Worblaufen-Bern :  International Potash Institute,  1979. 
 - 593 p. :  ill. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants--Nutrition.