Soil Inorganic Nitrogen — Switchgrass Nitrogen Rate Experiment
Soil extractable nitrogen (ammonium and nitrate plus nitrate) concentrations in surface soils (0-25 cm) of the Switchgrass Nitrogen Rate Experiment, 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.
|Experiment:||Switchgrass Nitrogen Rate Experiment|
|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|
|Soil Inorganic N|
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|2009.0||2009-06-20||B4F84||SWF4||84||4||9.85||9.43||1 harvest per year|
|2009.0||2009-06-23||B4F84||SWF4||84||4||29.51||12.54||1 harvest per year|