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Interpretive Summaries:
2009 - Evaluation of Corn Response to Sulfur Fertilization in Iowa
2008 - Evaluation of Corn Response to Sulfur Fertilization in Iowa
2007 - Evaluation of Corn Response to Sulfur Fertilization in Iowa
Evaluation of Corn Response to Sulfur Fertilization in Iowa, 2009
In 2009, a series of on-farm strip trials was established to survey the frequency of corn response to S fertilization. At each field location, one rate of S was compared to no S applied. The S source was calcium sulfate (gypsum). Within-field replicates ranged from 3 to 9 across locations. Fifteen sites were established and 11 had useable data.
Seven different counties were represented and ranged from the middle of Iowa to the far northeastern part of the state. Sulfur rates across locations ranged from 15 to 40 lb S/A. A significant increase in corn yield to S fertilization occurred at 6 of the 11 sites, for a relative frequency of 55%. This frequency is similar to that of other recent small plot research conducted in northeast Iowa. Yield increases at the responsive sites ranged from 5 to 13 bu/A and were large enough to more than pay for S application. IA-18F
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