Cool early summer temperatures have promoted symptom development of soybean iron chlorosis in some parts of Iowa, according to reports from Iowa State University field crop specialists and samples submitted to the Iowa State University Plant Disease Clinic. Yellowing soybean caused by iron chlorosis was a problem last growing season, and it may be a problem again for some growers this season.
Iowa State University
Sawyer, John E., "Is it iron or potassium deficiency?" (2002). Integrated Crop Management News. 1784.
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