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Sulfur Losses in Rainfall (05/21/15)

The high rainfall over the past week has resulted in S losses, particularly in sandier soils, especially on hilltops and slopes.

Sulfur Losses in Rainfall

The high rainfall over the past week has resulted in S losses, particularly in sandier soils, especially on hilltops and slopes. Even if sulfate sulfur was applied preplant or at planting, supplemental S on these soils may be necessary. Small grains, corn and canola are most susceptible to S deficiency. For some reason unknown to me or my soil fertility colleagues, soybean is not nearly as susceptible as the aforementioned crops. Supplemental S can be applied as dry ammonium sulfate over the top, or streamed in small grains as ammonium thiosulfate. Do not broadcast ammonium thiosulfate over any crop, except injected into an irrigation rig. Supplemental S can also be applied to corn side-dress, by adding ammonium thiosulfate to the UAN solution. Coulter application in corn is best when rainfall is not expected for several days.

Dave Franzen

NDSU Extension Soil Specialist

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