This readme file was generated on 2025-09-09 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: Soil organic matter in a cereal-only cropping system (R3-0020), crop and soil data from 1971 and onwards Creator(s)/Primary investigator(s): Swedish University of Agricultural Sciences Persistent identifier of dataset: Related publication for description of project, methods etc: Mattsson, L., 2010, Soil Organic C Development in Cereal and Ley Systems. Data from 20 years old Swedish field experiments https://doi.org/10.1080/03650340214164 [In English] Missing data delimiter: NA ----------------------------------------- FILE OVERVIEW ----------------------------------------- R30020_data.tsv Tab-delimited numeric data corresponding to soil and crop properties from experiment. Relationship between files: R30020_data column names LTE, ID, year, crop, plotID, treatment_code, straw_management, N_added, component, variable, value, and unit defined in R30020_metadata.tsv; components defined in R30020component_descriptions.tsv; variable defined in R30020variable_descriptions.tsv; units defined in R30020unit_descriptions.tsv; location defined in R30020location_description.tsv R30020_metadata.tsv Tab-delimited definitions of column names in R30020_data.tsv R30020component_description.tsv Tab-delimited definitions of component column in R30020_data.tsv R30020variable_description.tsv Tab-delimited definitions of variable column in R30020_data.tsv R30020unit_description.tsv Tab-delimited definitions of unit column in R30020_data.tsv R30020location_description.tsv Tab-delimited definitions of location column in R30020_data.tsv ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R30020_data.tsv ----------------------------------------- License: CC0 1.0 Number of columns: 13 Number of rows: 25695 Explanation of missing/empty data: data outside of feasible values are denoted by NA. Variable list: Column Description LTE The SLU code for the experimental series ID THe SLU code for the specific experiemntal site plotID Denotes the specific plot (parcell) number. X is used when data was collected from a composite sample from all plots with the same treatment. treatment_code Denotes treatment code, the combination of factors for the plot straw_management Denotes if straw is kept in the field or removed N_added Denotes four levels of yearly N addition component The component that has been analysed or observed year The year the sample or observation was taken crop The crop grown during the growing season variable The measured variable value The value of the variable unit The unit for the measured variable ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R30020component_description.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 2 Number of rows/cases: 5 Variable list: component: name of component as in component column of R30020_data.tsv description: definition of component ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R30020variable_description.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 3 Number of rows/cases: 22 Variable list: variable: name of variable as in R30020_data.tsv description: definition of variable unit: definition of variable unit ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R30020unit_description.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 3 Number of rows/cases: 8 Variable list: unit: name of unit as in R30020_data.tsv description: definition of unit note: comment about unit ----------------------------------------- DATA-SPECIFIC INFORMATION FOR R30020location_description.tsv ----------------------------------------- License: CC0 1.0 Number of columns/variables: 4 Number of rows/cases: 5 LTE The SLU code for the experimental serie ID The SLU code for the specific experimental site location The name of the experimental site Description Description of the sites location