GLBRC Sustainability Data Catalog

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:
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
Soil Inorganic N

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Data Excerpt

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
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