TY  - BOOK
AU  - Sparks, Donald L
TI  - Advances in agronomy. V.99, 2008
SN  - 9780123743602
U1  - 631/635 
PY  - 2008///
CY  - Amsterdam
PB  - Academic Press
KW  - Plant nutrition
KW  - Sustainable crop production
ER  -