Soil pH — Switchgrass Nitrogen Rate Experiment
Soil pH of surface cores (0-25 cm) from the Switchgrass Nitrogen Rate Experiment 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.
|Experiment:||Switchgrass Nitrogen Rate Experiment|
|Data available from:||November 2012 to October 2017|
|Core Areas||Inorganic Nutrients|
|sample date||the date the sample was taken|
|subplot||the (former) harvest subplots|
|treatment n rate kg ha||N fertilization rate||kg/ha|
|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|
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|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|