TY  - BOOK
AU  - Sparks, Donal, L.
TI  - Advances in Agronomy Vol 90
SN  - 9780120008087
U1  - 630/SPA 
PY  - 2006///
CY  - 
PB  - Elsevier
KW  - Agriculture
KW  - Agronomy
ER  -