1. Monsanto Co., 41006 Old Leland Rd. Leland MS 38756
2. Dep. of Plant and Soil Sciences, 368 Agricultural Hall Oklahoma State Univ. Stillwater OK 74078
3. Ohio State Univ. OARDC‐SENR 1680 Madison Ave. Wooster OH 44691
4. Dep. of Agronomy, 2308 Throckmorton Plant Sciences Center Kansas State Univ. Manhattan KS 66506
5. Dep. of Crop and Soil Sciences, 123 Horticultural Bldg. Univ. of Georgia Tifton GA 31793