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NDSU 2020 Soybean IDC Test Scores Available (08/27/20)

Soybean varieties differ in their tolerance to iron-deficiency chlorosis (IDC). Selecting a soybean variety with tolerance to IDC is the most important management decision producers can make in avoiding or reducing the negative yield effect of chlorosis.

Soybean varieties differ in their tolerance to iron-deficiency chlorosis (IDC). Selecting a soybean variety with tolerance to IDC is the most important management decision producers can make in avoiding or reducing the negative yield effect of chlorosis. In 2020, IDC was observed in many soybean fields in eastern North Dakota and northwestern Minnesota.

During the summer of 2020, NDSU’s soybean breeding program tested around 206 Enlist, LLGT27, Roundup Ready and Xtend soybean varieties, as well as 33 conventional and Liberty Link varieties for IDC tolerance. Varieties entered in the trial came from 25 seed companies. The test results are available at https://www.ag.ndsu.edu/varietytrials/soybean.

The results are based on replicated trials, conducted at two locations with a history of IDC. Visual ratings were made on a 1 to 5 scale (Photo 1), with 1 representing no chlorosis and 5 being the most severe chlorosis. Ratings were taken at two different soybean growth stages. The scores for the GMO group tested ranged from 1.6 (most tolerant) to 3.1 for the least tolerant variety. There were significant differences between varieties and producers are encouraged to select varieties with good IDC tolerance with high yield potential.

No soybean variety is immune to chlorosis, but large differences in yellowing and subsequent plant stunting occur between the more tolerant and susceptible varieties.

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Ted Helms

Retired NDSU Soybean Breeder

 

Hans Kandel

Extension Agronomist Broadleaf Crops

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