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Iowa | In southern Iowa I've been experimenting with different populations and decided it depends on a lot on many factors, like the hybrid, soil, fertility of soil, how good and even of stand, the amount of rainfall, and just the year in general. Dad a I used to argue about this as I believed we needed a high population to get a good yield but now after doing my own experimenting I've decided Dad was right, spend money on fertilizer not seed.
Hefty's in South Dakota sell seed corn, the past 2 years they have had a interesting test plot that starts at 10,000 and goes to 80,000 in 10,000 increments. They sell seed corn and tell customers if their soil has less than a 3% base saturation of Potassium don't plant over a 30,000 population as corn should yield 8-10 bushel per 1,000 seed. at 30,000 that's a range of 240-300 bu per acre.
I've found some Hybrids like DKC65-95RIB seem to like high populations even on poor ground but last year on my best ground I had a 3 acre test with DKC68-35RIB in strips at both 28,000 and 37,000 and was surprised that the 28,000 out yielded the 37,000.
Edited by Kellysauto 1/24/2026 06:45
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corn planting rate southern iowa
