How much corn yield potential are you losing as the rain continues to fall across Ontario?
As of May 5, you haven’t lost anything yet, but yield potential does start to diminish around May 10, says Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) corn specialist Ben Rosser.
In this episode of RealAgriculture Corn School, Rosser explains that yield potential decline is pretty gradual from that date. By May 20, for example, all areas of the province still maintain 95% of corn yield potential.
Ontario research, conducted by former OMAFRA corn lead Greg Stewart and University of Guelph’s Dave Hooker, indicates growers at Elora maintain 95% yield potential to May 20; at Exeter the date is May 25; and growers further south at Ridgetown maintain this level of potential until May 30.
Rosser also discusses when growers should consider switching to shorter-season hybrids to maximize yield potential as the planting season drags on. For the areas of the province with less than 2800 CHU the switch date is generally May 15 to 20; for 2800 to 3200CHU, May 20 to 25; and for areas with greater than 3200CHU, May 30 to early June.
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