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Project Details:
Methodology
Objective
Justification
The main geographic area targeted will be northeast Iowa. However, trial sites will be located in nearby areas to assist in determining the geographic extent of potential S deficiency. Fields and sub-field areas with soils similar to those showing plant S deficiency, and yield response in alfalfa, will be targeted for trials. Multiple fields (approximately eight expected) will be selected where there is greatest potential for finding S deficiency. Treatments will include ammonium sulfate and gypsum applied at 0, 15, and 30 lb S/acre. Each treatment will be replicated four times. Nitrogen application will be equalized for all plots. Treatments will be broadcast applied in the spring and incorporated or surface applied prior to planting if no-tilled. Plot size will accommodate planter width, but typically will be six rows wide by 50 feet in length. Before S application, soil will be sampled from the 0-6 inch depth from each replicate for routine soil test analyses. At silking, ear leaf samples will be collected from all treatment plots and analyzed for total-S. Grain yield will be determined by hand harvest from the center two rows of each plot.
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