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Colby, Kansas | Keep in mind that here we're using a lot of 108-113 day corns that have a great deal of ear-flex. For you location and maturity you are going to have inherently fixed eared genetics to work with, so I would speculate your going to have to push your populations relative to us. Here, my gut feeling has always been that if we're dropping a 113 flex-eared hybrid at 16 or 16,500 then we probably need to be dropping our 90 day (short season to us) corn around 18 or 18,500. Brett Allen at the Sidney, MT USDA station (http://www.ars.usda.gov/pandp/locations/cityPeopleList.cfm?modecode=30-32-05-10) has done quite a bit of dryland corn work, he might have some insight that is more regionally adapted to you.
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Corn population impact on maturity in low yield area
