Farm Progress is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Serving: MI
field with young crop plants Ricardo Costa, MSUE
SEEDING RATES: Since more than 60% of corn in Michigan has not been planted yet, many farmers are asking if seeding rates should be changed.

Late-planted corn: Should farmers change seeding rates?

Studies show there is no direct relationship between economic optimum corn population and planting dates.

By Ricardo Costa

In 2018, farmers were worried because corn planting was delayed in Michigan because of the weather. But compare that with planting progress in 2019, and now you have a sense of what being delayed really looks like.

As of June 4, based on the last Michigan Crop Weather report provided by USDA, less than 40% of corn has been planted so far. When we compare this data with last year’s data, more than 60% of corn was in the ground by the end of May. We can realize that maybe we shouldn’t have complained about last year’s planting season.

Because of such a delayed planting season, farmers that haven’t planted yet have started to wonder if they should change their seeding rates. The short answer for this question is no. You most likely don’t need to change the seeding rates because of your delayed corn planting.

Just as a reminder, recommended seeding rates take into consideration that 90% of the plants will survive, so you will be planting 10% more plants than your desired final plant population. For example, if you want a final stand of 30,000 plants per acre, you will need to plant 33,300 seeds per acre.

According to previous studies, there is no direct relationship between economic optimum corn population and planting dates, suggesting that planting populations will remain the same regardless of the planting dates.

There is one thing to remember: Soils, in general, will be warmer in June compared with late April or May, so corn germination, emergence and stand establishment probably will occur faster in delayed planting, allowing a higher percentage of final stand success.

That might allow you to reduce your seeding rates while allowing you to achieve the same desired final stand. In times when crop prices are not at their best, that might help you save a little on seed costs.    

To keep up on progress, the Field Crops Virtual Breakfast is back for the 2019 growing season. In agriculture, things can change fast. To help growers keep up with weather, pests and crop management issues, the Michigan State Extension field crops team will again hold free virtual breakfast sessions every week during the growing season via Zoom video or phone conference.

These virtual meetings will take place from 7 to 7:30 a.m. every Thursday morning through Sept. 5.

Participating is easy. Join using your computer or mobile device (audio and visual) following the Zoom link: Or, call in from your phone (audio only) by dialing 669-900-6833 and enter meeting ID 552-324-349.

To receive a weekly email reminder of the virtual breakfast, sign up at Participants receiving emails can opt in or out at any time.

To contact an expert in your area, visit or call 888-678-3464.

Costa is an Michigan State University Extension field crops educator.

Source: Michigan State University Extension, which is solely responsible for the information provided and is wholly owned by the source. Informa Business Media and all its subsidiaries are not responsible for any of the content contained in this information asset.
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.