1. Wetland Biogeochemistry Inst., Louisiana State Univ., Baton Rouge, LA 70803‐7511 Formerly Dep. of Soil Science, North Carolina State Univ.
2. Dep. of Soil Science North Carolina State Univ. Raleigh NC 27695‐7619
3. Dep. of Soil Science North Carolina State Univ. Mountain Hortic. Crops Res. and Ext. Center, 2016 Fanning Bridge Rd. Fletcher NC 28732‐9216