Interaction of a Foliar Application of Iron HEDTA and Three Postemergence Broadleaf Herbicides with Soybeans Stressed from Chlorosis

Abstract

Soybeans stressed from chlorosis are often treated with postemergence herbicides to coincide with susceptibility of control of weed seedlings. Three postemergence herbicides, acifluorfen, imazamox, and lactofen were applied to chlorosis stressed soybeans with and without iron HEDTA. At one location, iron amendment resulted in lower yields with acifluorfen and lactofen. Yields were higher with iron amendment in the imazamox treatment, but lower crop injury and poorer weed control was also observed, suggesting that iron amendment antagonized imazamox. Iron amendment did not reduce visual symptoms of chlorosis, herbicide injury, nor did it result in yield increase at any location. Application of iron HEDTA with these herbicides would not be recommended for chlorosis relief.

Keywords:

• Soybean
• Iron chlorosis
• Herbicides
• Weed control
• Foliar fertilizer

Acknowledgments

The authors gratefully thank the North Dakota Soybean Council for their financial support of this project.