Soil Inorganic Nitrogen — Switchgrass Nitrogen Rate Experiment
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Soil extractable nitrogen (ammonium and nitrate plus nitrate) concentrations in surface soils (0-25 cm) of the Switchgrass Nitrogen Rate Experiment (formerly Nitrogen/Harvest), monitored over the growing season, and reported as mg N per kg dry soil.
This datatable is part of the Switchgrass Nitrogen Rate Experiment dataset. Data from the Switchgrass Nitrogen Rate Experiment (formerly Nitrogen/Harvest) at the KBS GLBRC Intensive Field Site. Switchgrass is grown under 8 rates of nitrogen fertilization (F1-F8; 0-196 kg N/ha) with each treatment plot replicated in four blocks (R1-R4). From 2010–2012, the experiment also included split plots with two harvest strategies (H1, H2; 1 vs 2 harvests/yr) for each nitrogen treatment; from 2013 onward all split plots are harvested only once in the fall, with yields measured separately 2013-2022 and combined starting in 2023.
See the Switchgrass Nitrogen Rate Experiment map for further details.
Note
| Experiment: | Switchgrass Nitrogen Rate Experiment |
| Dataset: | GLBRC132 |
| Datatable ID: | GLBRC088-011.60 |
| Repository link: | |
| Related Tables: | |
| Personnel: |
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| Last Updated | 2022-09-29 |
| Variate | Description | Units |
|---|---|---|
| year | year of the growing season | |
| sample date | date soil was collected | |
| treatment n rate kg ha | experimental treatment - nitrogen application rate | kg/ha |
| replicate | replicate block nested within treatment | |
| nitrate mg kg | soil extractable nitrate plus nitrite, as N, average of analytical replicates, screened for outliers and corrected for soil moisture | mg/kg |
| ammonium mg kg | soil extractable ammonium, as N, average of analytical replicates, screened for outliers and corrected for soil moisture | mg/kg |
| harvest strategy | number of harvests per year | |
| comments | notes specific to the data row |
| Protocols |
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| Soil Inorganic N |
GLBRC data is not yet publicly available.
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| year | sample_date | treatment_n_rate_kg_ha | replicate | nitrate_mg_kg | ammonium_mg_kg | harvest_strategy | comments |
|---|---|---|---|---|---|---|---|
| 2009.0 | 2009-06-20 | 84 | 4 | 9.85 | 9.43 | 1 harvest per year | |
| 2009.0 | 2009-06-23 | 84 | 4 | 29.51 | 12.54 | 1 harvest per year |