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- Cooperative Investigation, Agricultural Research Service, U.S. Department of Agriculture, and the Agricultural Experiment Station, University of Wisconsin‐Madison. Research supported by the College of Agricultural and Life Sciences, University of Wisconsin‐Madison, by USDA Cooperative Agreement 12–14–100–10,888, and by an award from the UN Graduate School Research Committee. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.
- Former Postdoctoral Fellow, Graduate Research Assistant, Associate Professor of Agronomy, and Research Chemist, U.S. Department of Agriculture. (VLY is also Associate Professor of Agronomy). Present address of DAC: Battelle, Pacific Northwest Laboratories, Ecosystems Department, Richland, Washington 99352.