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S Illinois | To me heat would be a combined high low temp into that 160-165 range. Even with moisture, the plant speeds up maturity and expends sugars made at night with little cool down. High heat would start at 170 combined. 180 combined would put one into historical. This scale is not truly linear. Going from 160-165 is not nearly as bad as the 165-170 step.
This is all coming from non irrigated lower soil moisture holding capacity soils with yield goals of around 200. In an ideal world I would take a whole summer of combined 130 total.
Edit: This scale is probably lower than many and if no one ever got “heat” we would have a 190+ national corn average. So it’s not to say we have a crop failure over these numbers. It’s just maximum corn yields begin to drop.
Edited by w1891 7/6/2020 16:52
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What IS "heat"?
