This readme file was generated on 2024-12-24 by Grace Pold and provides a list and description of each file included in the dataset.

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DATASET GENERAL INFORMATION
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Title of dataset: SLU long-term field experiments: The frame trial (R3-RAM56), crop and soil data from 1956 and onwards
Creator(s)/Primary investigator(s): Swedish University of Agricultural Sciences
Persistent identifier of dataset: https://doi.org/10.5878/7f5n-vp94
Related publication for description of project, methods etc: Persson, J. and Kirchmann, H., 1994. Carbon and nitrogen in arable soils as affected by supply of N fertilizers and organic manures. Agriculture, Ecosystems & Environment, 51(1-2), pp.249-255. doi:10.1016/0167-8809(94)90048-5
Missing data delimiter: NA

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FILE OVERVIEW
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RAM56_data.tsv
Tab-delimited numeric data corresponding to soil, amendment and crop properties from experiment. 
Relationship between files: treatments defined in RAM56plot_metadata.tsv. components defined in RAM56component_descriptions.tsv. variables defined in RAM56variable_descriptions.tsv. unit defined in RAM56unit_descriptions.tsv

RAM56plot_metadata.tsv
Tab-delimited data describing plot amendments and treatments.
Relationship between files: components defined in RAM56component_descriptions.tsv. variables defined in RAM56variable_descriptions.tsv. unit defined in RAM56unit_descriptions.tsv

RAM56component_descriptions.tsv
Tab-delimited definitions of components column in RAM56_data.tsv
Relationship between files: treatments defined in RAM56plot_metadata.tsv. variables defined in RAM56variable_descriptions.tsv. unit defined in RAM56unit_descriptions.tsv

RAM56variable_descriptions.tsv
Tab-delimited definitions of variable column in RAM56_data.tsv
Relationship between files: treatments defined in RAM56plot_metadata.tsv. components defined in RAM56component_descriptions.tsv. unit defined in RAM56unit_descriptions.tsv

RAM56unit_descriptions.tsv
Tab-delimited definitions of unit column in RAM56_data.tsv
Relationship between files: treatments defined in RAM56plot_metadata.tsv. components defined in RAM56component_descriptions.tsv. variables defined in RAM56variable_descriptions.tsv. 

RAM56_plot_layout.svg
Diagram of plot layout in RAM56 experiment
Relationship between files: demonstrates spatial proximity of plots listed in RAM56_data.tsv

RAM56_harvest_dates.tsv
Tab-delimited dates of crop harvest in RAM56 experiment
Relationship between files: provides contextual information for crop data described in RAM56_data.tsv

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DATA-SPECIFIC INFORMATION FOR RAM56_data.tsv
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License: CC0 1.0 

Number of columns/variables: 11

Number of rows/cases: 23404

Explanation of missing/empty data: data corresponding to variables only measured in one year, outside of feasible values or inconsistent with other years of data collection are denoted by NA. Rationale for data exclusion is provided in "comments" column of data file
    
Variable list:  

	LTE: Name of long term experimental series
	year: Year data was collected
	crop: Latin name of crop
	plotID: Name of the plot from which data is collected numbered 1-60 or NA if missing data
	treatment_code: Code for the specific combination of factors. See definitions in plot_metadata.tsv
	component: Analysed matter. Component described in RAM56component_descriptions.tsv
	variable: Declares what has been tested. Variables described in RAM56variable_descriptions.tsv
	value: Result for the specific variable or component or factors etc. NA denotes missing or excluded values.
	unit: Explaining the unit used for the value. Units described in further detail below. 
	comments: comments on data including rationale for exclusion.
 	crop_common_name: common english name for crop, including sowing season for rapeseed, wheat and barley.


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DATA-SPECIFIC INFORMATION FOR RAM56plot_metadata.tsv
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License: CC0 1.0 

Number of columns/variables: 2

Number of rows/cases: 15

Variable list:  
	treatment_code: letter (A-O) used as shorthand in file RAM56_data to describe amendment type
	Amendment description: description of amendment type of corresponding treatment_code


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DATA-SPECIFIC INFORMATION FOR RAM56component_descriptions.tsv
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License: CC0 1.0 

Number of columns/variables: 2

Number of rows/cases: 11

Variable list:  
	component: name of component as in component column of RAM56_data.tsv
	description: definition of component

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DATA-SPECIFIC INFORMATION FOR RAM56variable_descriptions.tsv
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License: CC0 1.0 

Number of columns/variables: 2

Number of rows/cases: 35

Variable list:  
	variable: name of variable as in RAM56_data.tsv
	description: definition of variable

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DATA-SPECIFIC INFORMATION FOR RAM56unit_descriptions.tsv
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License: CC0 1.0 

Number of columns/variables: 2

Number of rows/cases: 3

Variable list:  
	unit: name of unit as in RAM56_data.tsv
	description: definition of unit

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DATA-SPECIFIC INFORMATION FOR RAM56_harvest_dates.tsv
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License: CC0 1.0 

Number of columns/variables: 3

Number of rows/cases: 69

Variable list:  
	year: year data corresponds to
	crop: Latin name of crop
	sow_date: date of sowing (YYYYMMDD)
	harvest_date: date of harvest (YYYYMMDD)
	crop_comments: comments on crop success

