1. NOAA's National Climatic Data Center Cooperative Institute for Climate and Satellites, North Carolina State Univ. 151 Patton Ave Asheville NC 28801
2. USDA‐ARS Plant Science Research Unit, and Dep. of Crop Science North Carolina State Univ. Raleigh NC 27695
3. Dep. of Mathematics and Center for Research in Scientific Computation North Carolina State Univ. Raleigh NC 27695
4. Dep. of Soil Science North Carolina State Univ. Raleigh NC 27695