Soil Test Lab Analyses - Agronomic — Resource Gradient 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Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

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: KBS033-005.91
Core Areas Inorganic Nutrients,Disturbance
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Last Updated 2022-02-17
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
top depth cm the top depth of the soil sample
irrigated true if the plot is irrigated, false if it is not
bottom depth cm the bottom of the soil core
ph pH measured
p Bray P1 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 top_depth_cm bottom_depth_cm irrigated ph p k ca mg lime_index cec z_ppm s_ppm b_ppm
Resource Gradient Experiment 2011-09-07 104 F4 R1 0 25 false 6.8 21.0 48.0 649.0 167.0
Resource Gradient Experiment 2011-09-07 709 F1 R3 0 25 true 6.8 20.0 56.0 846.0 180.0
Resource Gradient Experiment 2011-09-07 806 F2 R4 0 25 true 6.8 19.0 87.0 780.0 176.0
Resource Gradient Experiment 2011-09-07 605 F3 R2 0 25 true 6.8 24.0 67.0 716.0 130.0
Resource Gradient Experiment 2011-09-07 101 F1 R1 0 25 false 6.5 29.0 63.0 422.0 83.0 70.0
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