Database Research Summaries
2018 Visual ratings for Iron-Deficiency Chlorosis

calendar_today Year of Research: 2018
update Posted On: 12/04/2019
group Ted Helms (Principal Investigator, North Dakota State University)
bookmark North Dakota Soybean Council

Research Focus

The focus of this project is to assist growers in their selection of IDC tolerant cultivars to increase yield on fields that have a past history of IDC.


  • Screen all private company varieties that have been entered into the
    Langdon Research and Extension Center (REC), Carrington REC, Minot REC, Williston REC and Fargo Main Station yield trials for visual ratings of IDC at multiple field locations with a past history of IDC symptoms.
  • Provide visual IDC screening of approximately 100 advanced NDSU breeding lines.


  1. In 2017, four locations on farmer-cooperator fields with a past history of IDC symptoms had been identified and were later planted with hill-plots. There were 270 Roundup Ready company varieties tested and 72 Liberty Link and non-GMO company varieties tested.
  2. The NDSU soybean breeder evaluated 106 advanced NDSU breeding lines for visual IDC symptoms. Those locations included Leonard, Prosper, Hunter and Colfax, ND. A total of 7,168 hill-plots were planted. Data was analyzed and reported in the NDSU bulletin entitled ‘North Dakota Soybean Performance’ and was posted online.
  3. This is the largest data set with the most comparisons of many different company varieties, both Roundup Ready, Liberty Link and non-GMO for North Dakota and western Minnesota. Because 2017 data is averaged across four locations with four replications per location, the data is quite reliable in aiding growers to select the best varieties for their IDC prone fields.


  • This data will provide an independent confirmation of the IDC tolerance of company products and enable growers to compare varieties from many different companies with all of those varieties evaluated at the same locations.
  • This data enables growers to increase their yield on their IDC prone fields because those varieties with the least amount of yellow IDC symptoms will yield the best on those fields that have that problem.

For more information about this research project, please visit the National Soybean Checkoff Research Database.

Funded in part by the soybean checkoff.