1. USDA‐ARS Coastal Plains SoilWater, and Plant Research Center2611 W. Lucas St.FlorenceSC29501
2. Auburn Univ.Dep. of Agronomy and SoilsAuburnAL36849
3. South Dakota State Univ.Dep. of Plant ScienceBox 2140CBrookingsSD57007
4. Cotton Incorporated6399 Weston Pkwy.CaryNC27513