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S Illinois | Here is likely the area where deviations are occurring.
http://www.nass.usda.gov/Education_and_Outreach/Understanding_Stati... page 8
"Historical average ear weights are used until ears are present to measure. Kernel row length models are then used to project ear weight until crop maturity."
As of Aug 1 almost 90% of the corn was silking so there was likely a high percentage of corn with ears formed.
Here are the variables are they inputing in their model, but the question is how are these variables measured?
length over husk
kernel row length
ear diameter | |
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What I get from the tour
