TY  - BOOK
AU  - Sparks L, Donald, ed
TI  - Advances in Agronomy-Volume 60,1997
SN  - 0120007606
U1  - 630/SPA 
PY  - 1997///
CY  - London
PB  - Academic Press
KW  - Agriculture--Research
KW  - Agronomy
ER  -