Soil nitrogen 
edited by W.V. Bartholomew and Francis E. Clark. 
 - Madison, Wis.  American Society of Agronomy  1965. 
 - xvi, 615 pages:    illustration.;   24 cm. 
 - Agronomy ; no.10 .
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Nitrogen content<br/>Plants, Effect of nitrogen on