TY  - BOOK
AU  - Hay,  R. K.
AU  - Porter,  J. R.
TI  - The Physiology of crop yield
SN  - 101405108592
AV  - sb112.5 H38  2006 
PY  - 2006///
CY  - Oxford 
PB  - Blackwelll
KW  - Crops
KW  - Physiology
KW  - Crops  yield
ER  -