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Northern Illinois Agriculture

University of Illinois Extension
dekalb planting date corn

2012 NIARC planting dates and fungicides in corn

Posted by Russel Higgins -

Results from the 2012 corn date of planting study with an early and late hybrid, with and without an R1 application of fungicides at the NIARC provided similar results to previous years. Significant responses were found between the two hybrids, date of planting, and date x hybrid.

The four planting dates at the NIARC in 2012 were

  • March 29th
  • April 19th
  • May 9th
  • May 29th

The two hybrids were planted at 36,800 plants per acre in 30 inch rows. The middle 2 of 4 planted rows were harvested for yield. The "full season" or late hybrid yielded similar in the first three planting dates but dropped significantly in the late May planting. The "early" hybrid yielded significantly higher on April 19th and May 9th compared to the late March and May plantings. We did not have an earlier March planting at the NIARC. However, an early planting was made on the south farms in mid-March which seemed like a good idea at the time, but frost in April damaged it, obliterating any advantage. A good reminder to Illinois producers (especially in northern Illinois) that despite favorable conditions occasionally experienced in March, a risk is associated with early planted corn.

In this study the fungicide applications did not result in a significant yield advantage.

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