Potential Impact of Dry Weather on Corn

High temperatures and lack of rain have caused many corn fields to roll in afternoon. Water is transpiring through leaves and the roots are not able to take up enough moisture. Leaf rolling only in the afternoon hours is probably not significant enough to reduce ear size. However, leaf rolling that occurs from shortly after sunup to after dusk will signal severe drought and impact yield.

As far as growth stages, corn is entering critical stages of growth where dry weather and heat can impact yield. The potential ear size is from V-5 through V-16. Early season, the number of rows of ear are being determined and later, potential number of ovules that can be fertilized are determined within the kernel row.

Drought stress two weeks before and after tassel can significantly impact corn yield. During pollination, the potential number of ovules fertilized will impact yield. Heat and drought can reduce fertilized kernels. If stress continues, drought stress may cause the ears to abort kernel tips. The actual number of kernels surviving can be determined following kernel set, which is a couple of weeks after pollination.

The next few weeks will be very important in determining the impact that dry weather will have on corn yield. Hope we receive a nice gentle rain soon.

For more information, contact Wayne Flanary at 660-446-3724 or Kurt Nagel at 816-776-6961, Extension Agronomists, University of Missouri Extension.


Growing Degree Tool Forecasts Corn Development

Spring corn planting across Northwest Missouri varied considerably with the ability of growers to plant into wet soils. So what is the impact of delayed planting and different planting dates across the region?

A tool called U2U Decision Support Tool for Corn GDD has been designed on the web so growers can compare current conditions to long term historical records so one can project trends through the end of the growing season.

You select the geographical area, planting date, maturity of corn and then project the current year’s development with that of historical weather information. Using this tool, one can run any number of scenarios to answer questions that are specific to the growers needs.

This tool was developed by nine Midwest universities and funded by USDA.

For more information, contact Wayne Flanary at 660-446-3724 or Kurt Nagel at 816-776-6961, Extension Agronomists, University of Missouri Extension.


Flood-related resources from MU Extension


In-depth information is available from these MU Extension publications, which are available for free download. (To access publications, use the links below or go extension.missouri.edu/publications/ and search by publication number.)

  • EMW1023, Quick Tips for Cleaning Up After a Flood – Tips on protective equipment; deciding what can be salvaged and what should be thrown away; safely drying, cleaning and disinfecting materials; and what to do before installing new drywall and insulation.
  • MP904, Resources for Your Flooded Home – Downloadable 24-page publication offers information about electrical systems; repairing walls; cleaning furniture, flooring, floor coverings, bedding and kitchen items; and controlling mold and mildew. Other information includes financial advice, filing insurance claims, avoiding fraud and hiring a contractor.
  • EMW1026, Safe Drinking Water in an Emergency – Downloadable guide sheet on storing and purifying drinking water during an emergency.

Missouri Flood Info on Facebook

Missouri Flood Info, http://www.facebook.com/MoFloodInfo, is a collaboration of state, federal and local agencies and organizations involved addressing flooding in Missouri, including the Partnership for Disaster Recovery. Managed by MU Extension.

Other links

Get research-based information to help you recover. MU Extension's Floods site has the tools you need. Find help locally with the NW Missouri Flood Response and Recovery Contacts (PDF). And stay up to date by following Missouri Flood Info on Facebook.


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MU Extension is the University of Missouri’s classroom in Holt County. We connect people to research-based education to enrich the quality of life and enhance the economic well-being of our communities. MU Extension-Holt County is your one-stop source for practical education and information on almost anything.

MU Extension partners with the Holt County Commission and other local organizations to provide education, information and services that meet people’s needs. The elected and appointed members of the Holt County extension council provide guidance in identifying those needs to ensure that our educational programs are relevant, reliable and responsive.

Whether it’s resources for yourself or your family, farm, business or community, we invite you to explore our website, call or email to learn how we can help you.


Northwest Missouri Extension News You Can Use

This monthly newsletter provides practical advice on a variety of subjects and reports on extension activities throughout the region. Northwest Missouri Extension News You Can Use