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Delayed Corn Planting Considerations: North-Central Corn Belt

 

Delayed Corn Planting Considerations: North-Central Corn Belt


Switching to Earlier Maturity Hybrids

  • When rainfall significantly delays field and planting operations, switching to early maturity hybrids may be considered to ensure timely crop maturation.

  • To help guide these decisions, Pioneer researchers conducted planting date studies over 18 years (1987-2004).

  • North-central Corn Belt studies included 29 environments in South Dakota, Minnesota, Iowa, Michigan and Ontario.

  • Results indicate that growers should plant full-season hybrids until approximately May 28. Switching to an early maturity hybrid prior to this point most likely will not be beneficial and may result in reduced profitability.

  • Growers should consult their local Pioneer representative for recommendations about hybrid switches under delayed planting conditions.

Profitability of Full-Season vs. Early Maturity Hybrids

 

Profitability of Full-Season vs. Early Maturity Hybr
  • Full-season hybrids provided the greatest profitability when planted up until May 28.

  • Growers may consider switching to an earlier maturity hybrid after May 28. Earlier maturity hybrids had a significant economic advantage for planting after June 1.

Wet field photo

Profitability of Mid-Maturity vs. Early Maturity Hybrids

 

Profitability of Mid-Maturity vs. Early Maturity Hybrids
  • Mid-maturity hybrids provided greater profitability when planted up until June 5.

  • Earlier maturity hybrids had a significant economic advantage for planting after June 11.

Corn Adjusts to Later Planting

  • A three-year study conducted by researchers at Purdue and Ohio State Universities documented that hybrids can adjust their growth and development, requiring fewer growing degree units (GDUs) to reach physiological maturity when planted late.

  • Averaged over all hybrids, locations and years, 244 fewer GDUs were required to reach maturity when planting was delayed from late April or early May to early- or mid-June (approximately 40 days).


GRAPH NOTES:
-- Adjusted gross income/acre was calculated as gross income at a corn price of $5.00/bu minus drying costs and discounts for low test weights. Higher corn price would move switching date later.
-- Drying costs were calculated based on 4 cents/bu for each point of moisture above 15%. Higher drying costs would move switching date earlier.

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