Fig. 1 Mean maize grain yield (0% moisture) in Ontario from 1892 to 1997, from Agriculture Statistics for Ontario, Ontario Ministry of Agriculture, Food and Rural Affairs, Queen's Printer of Ontario, Toronto, ON, Canada
Fig. 1 Mean maize grain yield (0% moisture) in Ontario from 1892 to 1997, from Agriculture Statistics for Ontario, Ontario Ministry of Agriculture, Food and Rural Affairs, Queen's Printer of Ontario, Toronto, ON, Canada