TY  - BOOK
AU  - Hatfield,Jerry L.
AU  - Follett,R.F.
TI  - Nitrogen in the environment: sources, problems, and management 
SN  - 9780123743473
PY  - 2008///
CY  - San Diego, CA
PB  - Academic Press
KW  - Nitrogen fertilizers
KW  - Environmental aspects
N1  - Includes bibliographical references and index
ER  -