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| All the practical yield data I have seen is statistically insignificant between 15" and 7.5".
The cups (meters) on most drills are a joke as they relate to seed spacing, and not to mention how far the seed has to travel to hit the ground. The 15" units seem to do a much better job of seed spacing. I have never seen any of these issues translate to greater yield through the combine.
Bottom line is I don't think either spacing really matters in the end based on my observations.
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15" vs 7.5" soybeans
