Seed treatment, seeding rate, and cultivar effects on iron deficiency chlorosis of soybean
2001
Goos, R.J. | Johnson, B.
Iron (Fe) deficiency chlorosis of soybean (Glycine max L. Merr.) is a common problem in the North Central United States. The objectives of these studies were to determine the effectiveness of seed treatment, seeding rate, and cultivar on the severity of chlorosis and yield of soybean grown in wide (76-cm) rows. A study in 1998 showed an early-season reduction in chlorosis when the seed of a susceptible variety ('Glacier') was treated with FeEDDHA, but not with Fe citrate. Studies in 1999 showed increases in leaf chlorophyll, crop height, and yield, as seeding rate of Glacier soybean was increased. Studies in 2000 compared the effectiveness of cultivar selection (Glacier, Council, Traill), seeding rate (370,000 versus 740,000 seed ha(-1)), and FeEDDHA seed treatment (0 versus 0.56 kg ha(-1)) on chlorosis severity and yield. Cultivar selection was the most effective tool in reducing chlorosis. Chlorosis was the lowest, and yields the highest with the most resistant cultivar, Traill, followed by the moderately resistant cultivar, Council. Increased seeding rate reduced chlorosis of all cultivars and increased the yield of Traill and Glacier. FeEDDHA seed treatment reduced chlorosis at the 2-3 trifoliolate and increased yield at one site. Cultivar selection was the most effective tool for reducing chlorosis, but increased seeding rates gave additional reduction in chlorosis. Chlorosis reduction by 0.56 kg ha(-1) of FeEDDHA was short-lived. Higher rates may be needed.
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