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northeastern Ohio | I'm over on the east side of Ohio with Canfield and Wooster silt loam soils. I planted most hybrids at 29k this year. I did one hybrid at 35k and it was the lowest yielder in my plot. It also went down BAD in that big wind storm last month. All the other hybrids stood very well despite about 6 hours of 50 mph winds.
A few years ago I planted one hybrid at 22k and it went over 200 bu that year. But in general I have found that most of the hybrids I am using max out on yield around 29k. Generally, I don't lose any yield by going over that, but my seed cost goes up and the chance of lodging increases.
Every year is different, every farm is different, and every hybrid is different. I would suggest doing a population plot next year to give yourself an idea of which way you need to go in population.
Here are the results of my plot this year. All are planted at 29k except B60e at 35k. I did not do any population comparisions this year:
Nature View Farms, LLC test plot 2008
Salem, OH
Planted No-till May 6th into alfalfa stubble
Harvested October 24
Hybrid dry bushels moisture
B64f 200 18.9
B60e 177 18.8
B60e 187 18.9
B64f 196 16.8
B58 200 17.1
B64f 209 17.9
X512 221 18.2
B64f 219 18.5
X295 203 17.6
B64f 216 17.9
X328 190 16.8
B64f 209 17.7
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corn population
