Archived Plant Samples — Switchgrass Nitrogen Rate Experiment
A list of archived plant material from the GLBRC Switchgrass Nitrogen Rate Experiment (formerly Nitrogen/Harvest). A subsample from the machine harvested crop is dried, ground and archived, and may also be analyzed for total carbon and nitrogen. Note that “Unsorted” indicates that subsamples from harvested switchgrass are not sorted to species and may contain plant material from other species. Also note that the plot label is derived from the following information “treatment name, plot number – original number of harvests per year”. For “SWF1 108-H1”, as an example, SWF1 is fertilization level #1 (0 kg N/ha), 108 is the plot in block #1 that is the eighth from the west, and H1 is the initial harvest strategy of 1 harvest per year.
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|
|Data available from:||January 2010 to January 2015|
|year||year of the growing season|
|sample date||date sampled|
|sample date described||sample date in words when multiple dates are combined|
|treatmentt||treatment of nitrogen application|
|plot||plot number representing plot identity|
|harvest scheme before 2012||H1: harvest once; H2: harvest twice|
|comment||notes about the data row|
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|2015||2015-11-11||KBS GLBRC Intensive Site||SWF5||101||H1||UnSorted|
|2015||2015-11-11||KBS GLBRC Intensive Site||SWF5||101||H2||UnSorted|
|2015||2015-11-11||KBS GLBRC Intensive Site||SWF3||102||H2||UnSorted|
|2015||2015-11-11||KBS GLBRC Intensive Site||SWF3||102||H1||UnSorted|
|2015||2015-11-11||KBS GLBRC Intensive Site||SWF8||103||H1||UnSorted|