Soybean variety selection key to managing IDC

Wednesday, September 25, 2024

North Dakota soybean producers faced significant challenges this year due to cool and wet conditions, which intensified iron deficiency chlorosis (IDC) symptoms in their fields. Ana Carcedo, a broadleaf crops agronomist at North Dakota State University (NDSU) Extension, noted that IDC continues to be a persistent problem for soybean farmers.

NDSU conducts annual research to assess soybean varieties for their tolerance to IDC, providing crucial information for farmers dealing with this issue. “Choosing soybean varieties less susceptible to IDC is the first step in addressing this issue,” advises Carcedo.

Carrie Miranda, NDSU soybean breeder, emphasizes that genetic differences among soybean varieties affect their tolerance to IDC. “Producers can use the NDSU data to choose an appropriate IDC-tolerant soybean variety for fields known to have IDC issues in the 2025 season.

Selecting a soybean variety with IDC tolerance is an important management decision that can help producers minimize the negative impact of chlorosis on yield,” she explains.

During the summer of 2024, NDSU’s soybean breeding program evaluated 170 Enlist, GT27, Roundup Ready, and Xtend soybean varieties, as well as 21 conventional varieties, for their tolerance to IDC. Symptoms of IDC include yellowing of leaves with green veins, browning, and stunted growth, which can significantly reduce yields.

The evaluations involved replicated trials in fields with a history of IDC, with visual ratings on a scale from 1 (no chlorosis) to 5 (severe chlorosis) recorded at three growth stages. Farmers can access the test results and yield data at vt.ag.ndsu.edu/list/soy.

While IDC tolerance is essential, farmers should also consider yield potential and other traits when selecting varieties, as similar IDC-tolerant varieties can vary in their yield performance. The North Dakota Soybean Council funded this research, supporting farmers in making informed decisions to tackle IDC challenges effectively.

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