Soil Inorganic Nitrogen — GLBRC Switchgrass Nitrogen Rate Experiment
Data in the KBS GLBRC core database may not be published without written permission of the lead investigator or project director Full terms of use
Soil extractable nitrogen (ammonium and nitrate plus nitrate) concentrations in surface soils (0-25 cm) of the Switchgrass Nitrogen Rate Experiment, monitored over the 2009-2010 growing seasons, and reported as mg N per kg dry soil.
This datatable is part of the Switchgrass Nitrogen Rate Experiment dataset.
This dataset contains 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.
Note
| Experiment: | GLBRC Switchgrass Nitrogen Rate Experiment |
| Data available from: | January 2009 to January 2010 |
| Dataset: | GLBRC132 |
| Datatable ID: | GLBRC088-011.132 |
| Repository link: | |
| Related Tables: |
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| Personnel: |
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| Last Updated | 2023-10-24 |
| Variate | Description | Units |
|---|---|---|
| year | year of the growing season | |
| sample date | date soil was collected | |
| treatment name | treatment name | |
| 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 |
GLBRC data is not yet publicly available.
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| year | sample_date | block_trt | treatment_name | treatment_n_rate_kg_ha | replicate | nitrate_mg_kg | ammonium_mg_kg | harvest_strategy | comments |
|---|---|---|---|---|---|---|---|---|---|
| 2010 | 2010-11-11 | B1F0 | SWF1 | 0 | 1 | 1.22 | 4.94 | 1 harvest per year | |
| 2010 | 2010-11-11 | B2F0 | SWF1 | 0 | 2 | 1.12 | 7.31 | 1 harvest per year |