GLBRC Sustainability Data Catalog

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Agronomic Soil Chemistry — GLBRC Marginal Land Experiment

Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

Deep core (to 1 m) and surface (typically 0-25 cm) soil samples are taken periodically and sent to an analytical laboratory for fertilizer/liming recommendations and analyzed for pH, lime index, phosphorus, potassium, calcium, magnesium, cation exchange capacity and, depending on laboratory, organic matter.

From 2012-2022, samples were analyzed by either the Michigan State University Soil and Plant Nutrient Laboratory or the University of Wisconsin Soils Laboratory, which included organic matter in their analyses.

This datatable is part of the Soil Properties — Marginal Land Experiment dataset. This dataset contains soil data for the GLBRC Marginal Land Experiment (MLE) originally established in 2013 at north, central and south sites in Wisconsin and Michigan. The experiment consists of six different biofuel cropping systems (a.k.a. treatments; G5-G10; including switchgrass, miscanthus, native grasses, hybrid poplar, early successional, and restored prairie, respectively) plus an historical vegetation control (G11), replicated in each of 4 blocks (R1-R4) at each site. Split-plot treatments were initiated in 2014-2016 to examine the effect of nitrogen fertilization [plus_n (+N) vs control (0N)] on all cropping systems.
Seasonal deployment of rainfall exclusion (rainout) shelters in the fertilized split plot of the switchgrass (G5) treatment began in 2018 to examine the effects of drought on plant growth. See the Marginal Land Rainfall Exclusion Experiment for these data.
Note that Block 1 at the Wisconsin Central – Hancock site was retired in 2015 and the entire Wisconsin South – Oregon site was retired after 2018 growing season when the maintenance, harvest, sampling and analysis of the remaining Wisconsin sites was transferred from UW staff to MSU staff.

Note

Experiment: GLBRC Marginal Land Experiment
Data available from: January 2012 to January 2018
Dataset: GLBRC094
Datatable ID: GLBRC094-003.273
Repository link:
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Last Updated 2023-01-13
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 centimeter
ph pH of soil solution dimensionless
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 mg/kg
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
2012 2012-09-15 Michigan Central - Lake City Exp. Station G10 R1 surface sampling 0 22 6.7 71.0 37.0 29.0 732.0 121.0 entire plot control 4.7426925 Sample was collected in September 2012 but the actual date in September is unknown.
2012 2012-09-15 Michigan Central - Lake City Exp. Station G10 R2 surface sampling 0 22 6.4 70.0 37.0 61.0 397.0 59.0 entire plot control 2.633077 Sample was collected in September 2012 but the actual date in September is unknown.
2012 2012-09-15 Michigan Central - Lake City Exp. Station G10 R3 surface sampling 0 22 6.7 70.0 51.0 156.0 476.0 95.0 entire plot control 3.5716667 Sample was collected in September 2012 but the actual date in September is unknown.
2012 2012-09-15 Michigan Central - Lake City Exp. Station G10 R4 surface sampling 0 22 6.2 69.0 19.0 99.0 560.0 104.0 entire plot control 5.120513 Sample was collected in September 2012 but the actual date in September is unknown.
2012 2012-09-15 Michigan Central - Lake City Exp. Station G11 R1 surface sampling 0 22 6.5 70.0 54.0 33.0 546.0 81.0 entire plot control 3.4896154 Sample was collected in September 2012 but the actual date in September is unknown.
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