Summary of Sulfur Strip Trials Conducted in Central and Northeast Iowa
Preliminary 2009 Results
Click on the heading above for the whole paper.
Last fall Sulfur (S) strip trials were conducted by John Sawyer, Professor; Daniel Barker, Assistant Scientist; ISU Extension Field Agronomists Brian Lang, George Cummins, and Mark Wuebker. The product was aplied by Heartland Co-op, Innovative Ag Solutions, and Five Star Co-op. Calcium Products, Inc. provided the SuperCal SO4 gypsum used in the central Iowa trials with Heartland Co-op.
Six of the ten field sites had a corn yield increase from the S application (Table 1). The other four sites had no yield difference with or without S application. This is a 60% response rate to S application, which is similar to other recent small plot research conducted in north central to northeast Iowa on S response in corn. For the six responding sites, the average yield increase from S application was 9 bu/acre, with a range of 5 to 13 bu/acre. These yield increases are large enough to more than pay for a S application (for corn, suggested rates are 15 lb S/acre for fine-textured soils and 25 lb S/acre for coarse-textured soils).
This initial strip trial work indicates that S deficiency is occurring across a wide geographic area of iowa from central to northeast Iowa, and at a frequency that justifies continued research on S fertilization and deficiency identification across Iowa corn and soybean production.
Calcium Products would like to thank everyone involved, especially the farmer cooperators!
Yield Starts Here is a blog for farmers, focusing on increasing yield and profitability by focusing on the soil. It is managed by Craig Dick, a Blogronomist and Sales and Marketing Manager at Calcium Products. Find other articles by Craig and guest writers at http://blog.calciumproducts.com/ .