| DataCode | | Nominal | Dataset Code |
| RecType | | Physical quantity | Record type |
| TrtID | | Nominal | Unique ID for every sample composed of treatment (burn and fertilization) combination, plot number, and date (YYYYMMDD) |
| Plot | | Nominal | Field Plot IDs |
| Block | | Nominal | Field Block IDs |
| Burn | | Code list | Plots are either annually burned (B) or unburned since 1986 (UB) |
| NaddBurn | | Nominal | Combination of burn (U or B) and fertilization (C or N or R) treatment. There are 6 combinations: UC, UN, UR, BC, BN, BR |
| Month | | Nominal | Month of sample collection |
| Date | | Date/time | Date of sample collected |
| Resin_NH4 | | Physical quantity | Mass of nitrogen as ammonium accumulated late April to early September in micrograms per resin bag (included only in September samples) |
| Resin_NO3 | | Physical quantity | Mass of nitrogen as nitrate accumulated late April to early September in micrograms per resin bag (included only in September samples) |
| GWC | | Physical quantity | Gravimetric water content: field water content in grams water gram soil after drying overnight at 105 degrees C |
| NP | | Physical quantity | Nitrification potential: rate of nitrate production in saturing ammonium solution in micrograms nitrogen per gram dry soil per hour |
| N2O_none | | Physical quantity | Denitrification potential: rate of nitrous oxide production from ambient soil nutrients in micrograms nitrogen per kilogram dry soil per hour |
| N2O_CN | | Physical quantity | Denitrification enzyme assay: rate of nitrous oxide production when unlimiting substrates of glucose and nitrate were added in micrograms nitrogen per kilogram dry soil per hour |
