TY  - BOOK
AU  - Sparks, Donald, L.
TI  - Advances in Agronomy. Vol 89
SN  - 9780120008070
U1  - 630/SPA 
PY  - 2006///
CY  - Elsevier
PB  - Academic Press
KW  - Agriculture
KW  - Agronomy
ER  -