DOI: 10.5061/dryad.n5tb2rc97
title: Nitrogen rate influences on protein concentration, yield, and NDVI in spring wheat following pea and cover crop mixture

description: Tabular data including average wheat grain yield, wheat grain protein
 concentration, NDVI readings, nugget:sill ratio, nitrogen rate treatment
 assignments at two scales (subplot and whole plot) are included. Data are
 associated with Nitrogen rate influences on protein
 concentration, yield, and NDVI in spring wheat following pea and cover
 crop mixture, published in Agrosystems, Geosciences & Environment
 in 2025. 
description: # Nitrogen rate influences on protein concentration, yield, and NDVI in
 spring wheat following pea and cover crop mixture Dataset DOI:
 [10.5061/dryad.n5tb2rc97](https://doi.org/10.5061/dryad.n5tb2rc97) ##
 Description of the data and file structure Tabular data at the subplot
 level associated with "Nitrogen rate influences on protein
 concentration, yield, and NDVI in spring wheat following pea and cover
 crop mixture". ### Files and variables #### File: BCS_NDVI_WP.csv
 **Description:** Data from a study on spring wheat in the year following
 pea and a cover crop at the whole-plot level. 
 
 ##### Variables * SamplingDate: Date of sampling in MM/DD/YYYY format *
 PlantingDate: Date of planting in MM/DD/YYYY format * DaysAfterPlanting:
 Days between planting and sampling * Plot: Plot ID * ObservationCount:
 Number of normalized difference vegetation index (NDVI) measurements taken
 in each plot with a tractor mounted crop circle instrument * AvgNDVI:
 Average NDVI at the plot level  * nugget: Nugget from plot-level NDVI
 semivariogram performed in Arc GIS Pro  * partialsill: Partial sill from
 plot-level NDVI semivariogram performed in Arc GIS Pro  * actualsill:
 Sill from plot-level NDVI semivariogram performed in Arc GIS Pro  * ratio:
 Nugget:sill ratio, used as a measure of spatial heterogeneity at plot
 level * range m: Range in meters from plot-level NDVI semivariogram
 performed in Arc GIS Pro  * Rotation: Rotation ID. Rotation 4 had spring
 wheat in 2018 and field pea-cover crop in 2019. Rotation 4 had field
 pea-cover crop in 2018 and spring wheat in 2019.  * CurrentCrop: Crop at
 time of sampling. All were spring wheat. * ResidueRemoval: Residue removal
 treatment of the larger study. All plots in this study had no residue
 removal. * NRate: Categorical nitrogen rate treatment assignments assigned
 at subplot level; target N level: A = 235 kg ha^−1^, B = 202 kg ha^−1^, C
 = 168 kg ha^−1^, D = 135 kg ha^−1^ 
 
 
 **File: BCS_NDVI_subplot.csv** **Description:** Data from a study on
 spring wheat in the year following pea and a cover crop at the subplot
 level. ##### Variables * SamplingDate: Date of sampling in MM/DD/YYYY
 format * PlantingDate: Date of planting in MM/DD/YYYY format *
 DaysAfterPlanting: Days between planting and sampling * Plot: Plot ID *
 Subplot: Subplot ID * Plot.Subplot: Unique name for each subplot within
 plot  * ObservationCount: Number of normalized difference vegetation index
 (NDVI) measurements taken in each subplot with a tractor mounted crop
 circle instrument * AvgNDVI: Average NDVI at the subplot level  * nugget:
 Nugget from subplot-level NDVI semivariogram performed in Arc GIS Pro  *
 partialsill: Partial sill from subplot-level NDVI semivariogram performed
 in Arc GIS Pro  * actualsill: Sill from subplot-level NDVI semivariogram
 performed in Arc GIS Pro  * ratio: Nugget:sill ratio, used as a measure of
 spatial heterogeneity at subplot level * range m: Range in meters from
 subplot-level NDVI semivariogram performed in Arc GIS Pro  * Rotation:
 Rotation ID. Rotation 4 had spring wheat in 2018 and field pea-cover crop
 in 2019. Rotation 4 had field pea-cover crop in 2018 and spring wheat in
 2019.  * CurrentCrop: Crop at time of sampling. All were spring wheat. *
 ResidueRemoval: Residue removal treatment of the larger study. All plots
 in this study had no residue removal. * NRate: Categorical nitrogen rate
 treatment assignments assigned at subplot level; target N level: A = 235
 kg ha^−1^, B = 202 kg ha^−1^, C = 168 kg ha^−1^, D = 135 kg ha^−1^