TY  - SER
AU  - Spark , Donald L. ,
TI  - Advances in Agronomy Vol. 91
SN  - 9780120008094
U1  - 630 
PY  - 2006///
CY  - Amsterdam
PB  - Elsevier Academic Press
KW  - Agriculture. & related technologies
KW  - Agronomy
ER  -