Nitrogen in agricultural soils / 
Frank J. Stevenson, editor. 
 - Madison, Wis. :  American Society of Agronomy,  1982. 
 - xx, 940 p. :  ill. 
 - Agronomy ;  no. 22 .
<br/><br/><label>ISBN: </label>0891180702 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Nitrogen content.<br/>Plants, Effect of nitrogen on.<br/>Crops and soils.<br/>Nitrogen fertilizers.
<br/><br/><label>LC Class. No.: </label>S592.6.N5  / N566 1982 
<br/><br/><label>Dewey Class. No.: </label>631.4/16�19