TY  - SER
AU  - Sparks, Donald L,
TI  - Advances in Agronomy Vol. 52
SN  - 0120007525
U1  - 630 
PY  - 1994///
CY  - San Diego
PB  - Academic Press Inc
KW  - Agriculture. & related technologies
KW  - Agronomy
ER  -