Summary of statewide evaluation in Iowa of alfalfa and corn yield response to applied sulfur fertilizers. On-farm, small-plot and field-length strip trial yield response data presented from 2005-2013.
Iowa State University Extension and Outreach
- Soil Management and Fertility
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John E. Sawyer, Brian J. Lang and Daniel W. Barker. "Sulfur Management for Iowa Crop Production" Ames, IA, United States(2015)
Available at: http://works.bepress.com/john-sawyer/10/