Agronomic Yields — Resource Gradient Experiment

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Agronomic grain yields of corn, soybean, and wheat harvested from rainfed and irrigated plots using a plot combine and expressed at standard moisture.

This datatable is part of the Resource Gradient Experiment dataset. This dataset contains the agronomic yields and soil properties of the LTER Resource Gradient Experiment, which applies nine different rates of nitrogen fertilization (F1-F9) to annual row crops under rainfed (since 1999) and irrigated (since 2003) conditions. Since 2006, row crops have followed the same rotation as the LTER Main Cropping System Experiment (MCSE; corn-soybean-wheat); continuous corn was grown from 1999-2005. Nitrogen fertilization rates differ by crop (since 2008) and are given on the plot map.

The experiment moved to its current location in the LTER Main Site in 2005; previous experimental designs and locations are given here


Experiment: Resource Gradient Experiment
Data available from: October 1999 to July 2019
Dataset: KBS033
Datatable ID: KBS033-001.113
Core Areas Primary Production,Disturbance
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Last Updated 2024-03-18
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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