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Yellow soybean too early this season?

August 12, 2021

Since early August Iowa farmers have been reporting soybean fields or parts of fields with yellow or greenish-yellow leaves in the upper canopy which resemble early senescence and sometimes nitrogen (N) deficiency symptoms. The soybean growth stage is mainly R4 to R5. Several factors can cause these symptoms. Rainfall has been extremely variable this season in Iowa, with severe drought still persisting in some areas of the state. Yet, areas in southern and southeast Iowa have experienced normal to excessive rainfall.

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Regional Update: July 5 to July 14, 2021

July 14, 2021 10:48 AM
Blog Post

The drier parts of the state finally received some much-needed rainfall, and unfortunately parts of southern Iowa that are pretty well saturated also received some more rain this past week. Herbicide injury in soybeans, yellow soybeans, corn rootworms, and foliar fungicide decisions were common questions or problems observed or received by ISU Extension Field Agronomists. Read on for more specifics on what’s going on in different areas of the state.

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