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The discussion and guidelines provided in this article assume "GDDs from planting". If your seed company rates their hybrids "from emergence", you need to add about 115 GDDs to the hybrid's rating to account for the GDDs required from planting to emergence. Consequently, you can be led astray by the Tool if you do not modify the "Black Layer GDDs" value in the Tool's input area. 1 for a 112-day hybrid with a default GDD rating of 2691 planted in Tippecanoe Co. Screen capture of U2U GDD Tool graphical display of historical and estimated future GDD accumulations and predicted corn development stages for a 112-day hybrid planted May 31 in Tippecanoe County, IN. on May 31 indicates the hybrid would mature on or about October 27, almost a week after the average first killing 28F freeze. Corny Trivia: Frost often develops on exposed leaf surfaces at temperatures of 32F or slightly higher and can cause significant leaf injury or death, but the corn plant usually remains alive and capable of remobilizing non-structural carbohydrates from the stalk tissues to the immature grain.
The following simple calculator can be used to quickly estimate the adjusted GDD requirements of a hybrid in response to delayed planting.
The graph depicts the estimates of silking and black layer dates for the 112-day hybrid planted on May 31, as well as the range of the estimates.
When you are viewing the actual graph on the Web site, estimates of GDD accumulations at specific dates "pop up" when you hover your computer mouse over parts of the line graph.
Interestingly, it appears that hybrids mature in fewer GDDs than predicted when planted "late".
Based on research we conducted some years ago (Nielsen et al., 2002), hybrids planted later than about May 1 mature approximately 6.8 fewer GDDs for every day of delay beyond May 1, through at least the 2nd week of June (the latest planting dates we evaluated in the research).