Agronomic Soil Chemistry — GLBRC Marginal Land Experiment
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.
|Experiment:||GLBRC Marginal Land Experiment|
|Data available from:||January 2012 to January 2018|
|year||year soil sample was collected|
|sample date||date of soil coring|
|site||Wisconsin or Michigan sampling site|
|replicate||replicate nested within treatment|
|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|
|Marginal Land Experiment – Sampling|
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|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.|