Nitrogen in the environment :  sources, problems, and management / 
Jerry L. Hatfield and Ronald F. Follett (eds.) 
 - 2nd ed. 
 - San Diego, CA :  Academic Press,  2008 
 - xvi, 702 p. :  ill. ; 23 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780123743473 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen fertilizers<br/>Nitrogen fertilizers--Environmental aspects