Soil Test Lab Analyses - Agronomic

Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

Analytical results from the MSU Soil Test Lab on soil samples taken periodically from the Resource Gradient Experiment to determine fertilizer recommendations.

This datatable is part of the Resource Gradient Experiment dataset. This study provides a gradient of 9 different rates of nitrogen fertilization under rainfed and irrigated conditions. Irrigation began in 2003. Corn was grown from 2000-2005 and subsequently the crop rotation (wheat, corn, soybean) followed the crop of the LTER main site. Nitrogen applications differ by crop after 2007.

The experiment was moved to its current location on the LTER main site in 2005. The experiment location/history are explained here.

Plots are 5×30 m arranged in each of 4 replicate blocks .

Crop yields, nitrous oxide and soil temperature, moisture and nitrogen data are available for this study.


Experiment: Resource Gradient Experiment
Data available from: September 2011 to November 2019
Dataset: KBS033
Datatable ID: KBS033-005.89
Core Areas Inorganic Nutrients,Disturbance
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Last Updated 2020-07-10
Variate Description Units
site experimental site that was sampled
sample date date the sample was taken
plot plot number
treatment treatment where the sample was taken from
replicate replicate plot the sample was taken from
irrigated true if the plot is irrigated, false if it is not
ph pH measured dimensionless
p phosphorus in ppm mg/kg
k potassium in ppm mg/kg
ca calcium in ppm mg/kg
mg magnesium in ppm mg/kg
lime index the lime index
cec estimated cation exchange capacity meq/100g
z ppm zinc in ppm mg/kg
s ppm sulfur in ppm mg/kg
b ppm boron in ppm mg/kg

Data Excerpt

site sample_date plot treatment replicate irrigated ph p k ca mg lime_index cec z_ppm s_ppm b_ppm
Resource Gradient Experiment 2011-09-07 104 F4 R1 false 6.8 21.0 48.0 649.0 167.0
Resource Gradient Experiment 2011-09-07 709 F1 R3 true 6.8 20.0 56.0 846.0 180.0
Resource Gradient Experiment 2011-09-07 806 F2 R4 true 6.8 19.0 87.0 780.0 176.0
Resource Gradient Experiment 2011-09-07 605 F3 R2 true 6.8 24.0 67.0 716.0 130.0
Resource Gradient Experiment 2011-09-07 101 F1 R1 false 6.5 29.0 63.0 422.0 83.0 70.0
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