TY  - BOOK
AU  - Bartholomew, W.V.
TI  - Soil nitrogen
U1  - 631.84 B29S 
PY  - 1965///
CY  - Madison, U.S.
PB  - American Society of Agronomy
KW  - SOILS -- NITROGEN CONTENT
KW  - NITROGEN AS FERTILIZER
ER  -