GLBRC Sustainability Data Catalog

Soil pH — Switchgrass Nitrogen Rate Experiment

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Soil pH of surface cores (0-25 cm) from the Switchgrass Nitrogen Rate Experiment (formerly Nitrogen/Harvest) taken periodically to evaluate the need for liming. Analytical samples are prepared from field moist soil samples, sometimes in duplicate resulting in two pH measurements per sample.

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
Data available from: November 2012 to October 2017
Dataset: GLBRC132
Datatable ID: GLBRC088-023.60
Core Areas Inorganic Nutrients
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Last Updated 2023-01-24
Variate Description Units
sample date the date the sample was taken
plot plot
subplot the (former) harvest subplots
treatment n rate kg ha N fertilization rate kg/ha
treatment treatment name
replicate replicate
harvest strategy the number of harvests per year
pH the pH measured dimensionless
comments additional information that might be of use in interpreting the data
subsample soil subsample
Protocols
Soil pH

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Data Excerpt

sample_date plot subplot treatment_n_rate_kg_ha treatment replicate harvest_strategy ph comments subsample
2016-11-08 101 1 112.0 SWF5 1 1 harvest per year 5.87
2015-11-17 101 1 112.0 SWF5 1 1 harvest per year 5.57 2
2015-11-17 101 2 112.0 SWF5 1 1 harvest per year 5.4 This plot was harvested 2x/year through 2012. 2
2015-11-17 102 1 56.0 SWF3 1 1 harvest per year 5.83 2
2015-11-17 102 2 56.0 SWF3 1 1 harvest per year 6.03 This plot was harvested 2x/year through 2012. 2
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