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Think those guys with the night time temps are probably on track; however, my thoughts are that relative maturity probably makes a big difference too.
We all plant hybrids that will maximize production in our own local environment, based on averages. Throw a bunch of above "normal" heat at someones individual location, even with abundant soil moisture and you rush it towards maturity, never a good thing for maximizing yields, imho. Might have been a year to plant some later hybrids to take advantage of the environment; but, who knew?
In actuallity, IA & MN producers pulled back on RM this year after the scalping they took on drying costs last year, however subtle that might have been. That info I've got both anecdotally from talking to folks around the western belt & from seed co. folks of all levels. A small shift in maturity should lead to a small shift in yields, downward. Throw some heat into the situation and it could magnify that into something significant?
Mark
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