# soil: Soil variables In SoyURT: USDA Northern Region Uniform Soybean Tests Dataset

 soil R Documentation

## Soil variables

### Description

Soil variables in a depth interval of 5 to 15 cm were obtained from Soilgrids (https://soilgrids.org/) for the 63 observed locations in the historical series analyzed by Krause et al. (2022). The R code used to download and process the soil data can be retrieved at https://github.com/mdkrause/VarComp-ME/blob/main/soil_data.R.

### Usage

soil


### Format

A data frame in tidy format with 504 observations on the following 5 variables:

Feature

soil variables, 8 levels

location

locations, 63 levels (observed locations in the historical series)

Soil_Grid

mean values of the soil variables (Feature)

LAT

location latitude

LON

location longitude

### Details

Levels of Feature:

bdod_5-15cm_mean:

Bulk density of the fine earth fraction (cg/m^3)

cec_5-15cm_mean:

Cation Exchange Capacity of the soil (mmol(c)/kg)

clay_5-15cm_mean:

Proportion of clay particles (< 0.002 mm) in the fine earth fraction (g/kg)

nitrogen_5-15cm_mean:

Total nitrogen (cg/kg)

phh2o_5-15cm_mean:

Soil pH (pH\times10)

sand_5-15cm_mean:

Proportion of sand particles (> 0.05 mm) in the fine earth fraction (g/kg)

silt_5-15cm_mean:

Proportion of silt particles ( 0.002 mm and ≤q 0.05 mm) in the fine earth fraction (g/kg)

soc_5-15cm_mean:

Soil organic carbon content in the fine earth fraction (dg/kg)

### Source

Krause, M. D., Dias, K. O. G., Singh, A. K., and Beavis. W. D. (2022). Using large soybean historical data to study genotype by environment variation and identify mega-environments with the integration of genetic and non-genetic factors. bioRxiv, doi: 10.1101/2022.04.11.487885

SoyURT documentation built on June 13, 2022, 9:05 a.m.