TY  - BOOK
AU  - Hay, Robert K.M.
AU  - Porter, John R
TI  - The Physiology of crop yield
SN  - 9781405108592
U1  - 633 
PY  - 2006///
CY  - Oxford
PB  - Blackwell Publishing
KW  - Crops - Physiology
KW  - Crop yields
ER  -