This readme file was generated on 2025-06-18 by Sabina Braun and provides a list and description of each file included in the dataset. ----------------------------------------- DATASET GENERAL INFORMATION ----------------------------------------- Title of dataset: SLU long-term field experiments: The Swedish soil fertility experiments (R3-9001), crop and soil data from 1962 and onwards Creator(s)/Primary investigator(s): Swedish University of Agricultural Sciences Persistent identifier of dataset: https://doi.org/10.5878/eqj9-j270 Related publication for description of project, methods etc: Carlgren, K., & Mattsson, L. (2001). Swedish soil fertility experiments. Acta Agriculturae Scandinavica, Section B-Plant Soil Science, 51(2), 49-76. Missing data delimiter: NA ----------------------------------------- FILE OVERVIEW ----------------------------------------- R39001_data.tsv Tab-delimited numeric data corresponding to soil and crop properties from experiment. Relationship between files: treatments defined in R39001plot_metadata.tsv. components defined in R39001component_descriptions.tsv. variables defined in R39001variables_descriptions.tsv. units defined in R39001units_descriptions.tsv, location defined in R39001location_description.tsv R39001plot_metadata.tsv Tab-delimited data describing plot amendments and treatments. Relationship between files: components defined in R39001component_descriptions.tsv. variables defined in R39001variables_descriptions.tsv. unit defined in R39001units_descriptions.tsv R39001component_descriptions.tsv Tab-delimited definitions of components column in R39001_data.tsv Relationship between files: treatments defined in R39001plot_metadata.tsv. variables defined in R39001variables_descriptions.tsv. unit defined in R39001units_descriptions.tsv R39001variables_descriptions.tsv Tab-delimited definitions of variable column in R39001_data.tsv Relationship between files: treatments defined in R39001plot_metadata.tsv. components defined in R39001component_descriptions.tsv. unit defined in R39001units_descriptions.tsv R39001units_descriptions.tsv Tab-delimited definitions of unit column in R39001_data.tsv Relationship between files: treatments defined in R39001plot_metadata.tsv. components defined in R39001component_descriptions.tsv. variables defined in R39001variables_descriptions.tsv. R9001location_description.tsv ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001_data.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 15 Number of rows/cases: 249801 Explanation of missing/empty data: data outside of feasible values are denoted by NA. Variable list: variable description 1000_part_weight The weight of 1000 seeds AL_K Potassium (K) content in soil, measured by extraction with ammonium acetate lactate (AL) AL_P Phosphorus (P) content in soil, measured by extraction with ammonium acetate lactate (AL) bulk_density The bulk density of seeds density_harvest The percentage of gound covered by the crop by harvest density_spring The percentage of gound covered by the crop in spring gluten The glutent content of a grain HCl_K Potassium (K) content in soil, measured by extraction with hydrochloric acid (HCl) HCl_P Phosphorus (P) content in soil, measured by extraction with hydrochloric acid (HCl) lodging The permanent displacement of crop stems from their vertical position as a result of stem buckling and/or root displacement org_C Organic carbon (C) content part_grass The percentage of grass coverage part_legume The percentage of legume coverage part_other The percentage of coverage by plant other than grass or legume pH_H2O Soil pH measured in ultrapure water in 1:5 ratio (soil:solution, volume:volume) protein Amount of protein in the given component sugar_content Percentage of sugar in sugar beets sugar_yield Amount of sugar extracted from sugar beets tot_C Total carbon (C) content tot_K Total potassium (K) content tot_N Total nitrogen (N) content tot_P Total phosphorus (P) content yield Total dry mass of the given component ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001plot_metadata.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 8 Variable list: treatment_code Denotes treatment code, the combination of factors for the plot factor_crop_rotation Denotes factor crop rotation, I=system with livestock, II=system without livestock factor_PK Denotes four different levels of phosphorus (P) and potassium (K) addition factor_N Denotes four different levels of nitrogen (N) addition livestock_manure Denotes if the treatment recives any livestock manure ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001component_descriptions.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 12 Variable list: component: name of component as in component column of R39001_data.tsv description: definition of component ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001variables_descriptions.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 24 Variable list: variable: name of variable as in R39001_data.tsv description: definition of variable ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001units_descriptions.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 8 Variable list: unit: name of unit as in R39001_data.tsv description: definition of unit ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R39001location_descriptions.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 11 Variable Description LTE The SLU code for the experimental serie ID The SLU code for the specific experimental site Location The name of the experimental site