GLBRC Sustainability Data Catalog

Agronomic Soil Chemistry — GLBRC Marginal Land Rainfall Exclusion Experiment

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Surface soils under the rainfall exclusion ("rainout’) shelters are occasionally sampled and sent to an analytical lab (e.g., Michigan State University Soil and Plant Nutrient Laboratory through 2022) for fertilizer recommendations and analysis of pH, lime index, phosphorus, potassium, calcium, magnesium, and cation exchange capacity. To compare results with soils under ambient rainfall, use data from the fertilized G5 MLE split plots and BCSE main plots.

This datatable is part of the Marginal Land Rainfall Exclusion Experiment dataset. This dataset contains data from the GLBRC Marginal Land Rainfall Exclusion Experiment established in 2018 to examine the effects of drought on switchgrass production and composition. Rainfall exclusion (rainout) shelters are deployed over the growing season in fertilized split plots of the Switchgrass treatment (G5) at all sites of the Marginal Land Experiment (MLE) and in the Switchgrass treatment (G5) plots of the Biofuel Cropping System Experiment (BCSE) at the KBS GLBRC Intensive Site, which serves as a reference for cropped soils with higher fertility. Rainout shelters are deployed in four G5 replicate plots of the BCSE (R2-R5) and of the MLE (R1-R4) at all sites except Wisconsin Central–Hancock (R2-R4), which has only three replicates.


Experiment: GLBRC Marginal Land Rainfall Exclusion Experiment
Data available from: January 2012 to October 2021
Dataset: GLBRC134
Datatable ID: GLBRC134-002.106
Core Areas Inorganic Nutrients
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Last Updated 2023-01-19
Variate Description Units
year year soil sample was collected
sample date date of soil coring
site Wisconsin or Michigan sampling site
treatment experimental treatment
replicate replicate nested within treatment
campaign sampling intent
top depth cm upper soil sampling depth centimeter
bottom depth cm lower soil sampling depth
pH pH of soil solution
lime index indicator of potential acidity
p ppm phosphorus in soil mg/kg
k ppm potassium in soil mg/kg
ca ppm calcium in soil mg/kg
mg ppm magnesium ppm in soil
field section section of the field sampled
n treatment nitrogen treatment of given split plot
est cec Cation exchange capacity in meq/100g soil meq/100g
om percent organic matter percent %
wi plot id Arlington Wisconsin site's plot identifier
comments notes

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Data Excerpt

year sample_date site treatment replicate campaign top_depth_cm bottom_depth_cm ph lime_index p_ppm k_ppm ca_ppm mg_ppm field_section n_treatment est_cec om_percent wi_plot_id comments
2021.0 2021-10-05 Wisconsin Central - Hancock G5 R2 surface sampling 0 25 6.2 70.0 115.0 142.0 823.0 195.0 rainout plus_n 6.1041026
2018.0 2018-11-20 Michigan South - Lux Arbor Reserve G5 R3 surface sampling 0 25 5.6 68.0 16.0 63.0 772.0 127.0 rainout plus_n 7.4798717
2018.0 2018-11-12 Wisconsin Central - Hancock G5 R4 surface sampling 0 25 6.8 124.0 27.0 627.0 65.0 rainout plus_n 3.7458975
2021.0 2021-11-01 Wisconsin North - Rhinelander G5 R1 surface sampling 0 25 5.8 69.0 391.0 39.0 477.0 27.0 rainout plus_n 3.91
2021.0 2021-10-19 Michigan Central - Lake City Exp. Station G5 R4 surface sampling 0 25 6.6 72.0 10.0 23.0 779.0 57.0 rainout plus_n 4.428974
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