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Assess frost injury, crop recovery

June 1, 2021 10:51 AM
Blog Post

Frost injury occurred Saturday May 29 across much of the area.  Radiational frost occurs when leaf temperatures actually reach lower temperatures than nearby recorded air temperatures.

 

Frost has occurred

            - along field edges - especially corn fields

            - low areas

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Frost Damage to Soybeans

October 17, 2019 1:41 PM
Blog Post

Temperatures fell into the low 30’s and upper 20’s in most of Iowa over the weekend of October 11-13.  Because of the very late planting season, some crops were immature enough to be injured by the freezing temperatures. This ICM Blog will address frost damage concerns to soybeans.  

Frost normally forms early in the morning, driven by radiation cooling especially on clear cold nights.  The visual impact of the frost damage is most evident the next day (Figure 1).

Has frost bit you?

May 16, 2016 8:51 AM
Blog Post

Temperature is the key for both corn and soybean. Temperature below 28oF for a couple of hours will be lethal to growing tissue that has emerged. Temperatures between 28oF and 32oF will result in definite frost injury to above ground tissue. And temperatures between 32oF and 50oF will result in poor vigor and growth. Regardless of temperatures, the last couple of days have put planted corn and soybean at greater risk for pathogen infection. Make sure to get out into your fields over the next couple of days to assess stands.

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Frost - Impact on early corn growth (before V4)

Encyclopedia Article

When low temperatures and frost injure young corn, producers need to carefully weigh their options apart from the immediate and discouraging appearance of the plant. In many cases, the best response may be no response or at least a slightly delayed response. Growing points, which are below the surface until the six-leaf stage (V6) should be intact unless the freeze was substantial.

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Frost Damage to Crops

September 22, 2011

A September 15 frost hit some northern Iowa fields, causing damage to corn and soybean fields alike, especially fields that were already experiencing some type of stress. Yield reductions caused by the frost will depend on the maturity of the crop but across the board damage does not seem significant, according to ISU Extension Corn Agronomist Roger Elmore. He reminds producers that frost damaged crops will have changes in drydown rate and test weights

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Splitting Corn Seedlings to Assess Plant Viability

May 14, 2010
Frost on corn field

By Roger Elmore and Lori Abendroth, Department of Agronomy

A hard freeze last weekend resulted in leaf loss in emerged corn seedlings across central and northern Iowa.  Several recent articles in ICM news provide insight on the situation.  Photos 1 and 2 here show damage in one field in Story County; corn was at about V2 when the frost occurred.

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Crop: