With recent moisture, soybean fields in North Dakota and Minnesota are showing iron deficiency chlorosis. Lesley Lubenow, an extension cropping systems specialist at the NDSU Langdon Research Extension Center, has found fields with IDC symptoms in high water table areas. Spraying a foliar iron fertilizer at this time will only affect exposed leaves, as it is not mobile within the plant. “There are some commercial products that can be sprayed. However, NDSU research has shown the products don’t add to yield, it will just green up the crop.” If farmers do detect iron chlorosis, they should reference the variety of and it’s corresponding IDC score. “I would also reference the NDSU IDC Variety Trials online. Sometimes the company IDC scores are different when the soybeans are grown in our native soils.”
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