TY  - BOOK
AU  - Hauck, Roland D., ed.
TI  - Nitrogen in crop production
SN  - 0891180818
U1  - 631.484/HAU 
PY  - 1984///
CY  - Madison
PB  - American Society of Agronomy
KW  - Crops--Nutrition
KW  - Nitrogen fertilizers
ER  -