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Data in the KBS LTER core database may not be published without written permission of the lead investigator or project director Full terms of use

Grain yields (at standard moistures, in kg/ha) for corn, soy and wheat from rainfed and irrigated plots of the Resource Gradient Experiment.

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: October 1999 to July 2019
Dataset: KBS033
Datatable ID: KBS033-001.91
Core Areas Primary Production,Disturbance
Repository link:
Related Tables:
Last Updated 2021-04-06
Variate Description Units
date harvest date
plot plot number
location Study location. Please refer to the field location sketch.
treatment treatment number
replicate replicate that the sample was taken from
irrigated true if the plot is irrigated, false if it is not.
fertilizer rate kg ha the fertilizer rate applied kg/ha
crop crop grown
yield kg ha grain yield at standard moisture (15.5% for corn, 13% for soybean and wheat) kg/ha
year harvest year

Data Excerpt

date plot location treatment replicate irrigated fertilizer_rate_kg_ha crop yield_kg_ha year
1999-10-13 901 A 8 1 false 246.0 Zea mays L. (*) 3482.0 1999
1999-10-13 902 A 3 1 false 67.0 Zea mays L. (*) 3835.0 1999
1999-10-13 903 A 7 1 false 202.0 Zea mays L. (*) 3018.0 1999
1999-10-13 904 A 4 1 false 101.0 Zea mays L. (*) 3632.0 1999
1999-10-13 905 A 9 1 false 291.0 Zea mays L. (*) 4430.0 1999
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