Dataset: Broadbalk Wheat Experiment mean annual grain and straw yields 1852-1925

Summary

Mean annual grain and straw yields for each treatment strip of the Broadbalk Wheat Experiment, 1852-1925. Also other agronomic information, including sowing and harvest dates, amount, type and date of application of treatments, and winter wheat cultivars.

Methods

The treatment strips (plots) extend the whole length of the field, each testing a different fertilizer or manure treatment. In some years, the strips were divided into two or more sub-plots. Annual yield data presented here for each strip is the mean of all sub-plots, except when the fertilizer treatments were different (plots 9a and 9b, 15a and 15b, selected years), or if a sub-plot received a different treatment for one year, when it was excluded from the mean. See 'Broadbalk plan and cropping 1852-1925' for full details. Yield data from 1844-1851 is not included, as the fertilizer treatments were not fully established until 1852.

Technical Information

Wheat grain and straw yields have been recorded every year since the experiment began, with the first harvest in 1844 (the crop was sown in autumn 1843). Dried grain and straw samples have also been kept for chemical analysis since 1844; these are preserved in the Rothamsted Sample Archive. Yields are expressed at field moisture content, approximately 85% dry matter.

Related Documents

Related Datasets

Contributors

  • Margaret Glendining: Data curator
  • Andrew Macdonald: Project leader
  • Paul Poulton: Researcher
  • Sarah Perryman: Data curator
  • Nathalie Castells-Brooke: Data manager
  • Richard Ostler: Project manager

Dataset Access and Conditions

Rights Holder

Rothamsted Research

License

Creative Commons License This dataset is available under a Creative Commons Attribution Licence (4.0).

Cite this Dataset

YOU MUST CITE AS: Rothamsted Research (2021). Broadbalk Wheat Experiment mean annual grain and straw yields 1852-1925 Electronic Rothamsted Archive, Rothamsted Research 10.23637/rbk1-1796346264-1

Please review our How to Credit Datasets guidance for more information.

Conditions of Use

Rothamsted relies on the integrity of users to ensure that datasets are used appropriately and Rothamsted Research receives suitable acknowledgment as being the originators of these data. Please review the Conditions of Use before downloading.

Table Of Contents

Note the Excel file: 01-BKyield1852-1925.xlsx contains the same data as the CSV files listed below. The Excel file contains each of the CSV files as an Excel worksheet and is provided for users who prefer Excel over CSV.

Contents

File Dataset Name Description
README.html Read me File describing and explaining all details of the dataset (html)
README.txt Read me File describing and explaining all details of the dataset (txt)
crop_data.csv crop yield data The main data table containing mean annual grain and straw yield data for all strips (plots) and details of all fertilizer and manure treatments, 1852-1925. Also other agronomic information, including sowing and harvest dates, amount, type and date of application of treatments, and winter wheat cultivars. The strips extended the whole length of the field; each strip tested a different fertilizer or manure treatment. Most strips were divided into two or more sub-plots for many of the years 1852-1925. Annual yield data for each strip (plot) is the mean of all sub-plots, except when the fertilizer treatments were different (plots 9a and 9b, 15a and 15b, notes 6-7). If a sub-plot received a different treatment for one year it was excluded from the mean (notes 2-4). See notes and plan for full details.
fym_factor_data.csv FYM treatment factor level description Describes the FYM (farmyard manure) treatment factor levels used
rape_cake_factor_data.csv Rape cake treatment factor level description Describes the rape cake (a type of organic manure) treatment factor levels used
n_factor_data.csv N fertilizer treatment factor level descriptions Describes the different N (nitrogen) fertilizer treatment factor levels used
p_factor_data.csv P fertilizer treatment factor level descriptions Describes the P (phosphorus) fertilizer treatment factor levels used
k_factor_data.csv K fertilizer treatment factor level descriptions Describes the K (potassium) fertilizer treatment factor levels used
na_factor_data.csv Na fertilizer treatment factor level descriptions Describes the Na (sodium) fertilizer treatment factor levels used
mg_factor_data.csv Mg fertilizer treatment factor level descriptions Describes the Mg (magnesium) fertilizer treatment factor levels used
notes_data.csv Notes Additional explanatory notes for records in the crop_data table, including details of sub-plots.

Mean yields are derived from the individual sub-plot yields of grain and straw in the BKYIELD dataset in the e-RA database. The Broadbalk 'White Books' , held in the Rothamsted Library Archive, were used to check the treatments applied to the sub-plots.

In accordance with the Joint Code of Practice for Research at Rothamsted, data processing in e-RA follow rigorous standard operating procedures to ensure the quality and correctness of data collected in the field through to depositing in the e-RA database. To ensure quality control during data inputting, the data sets were typed on two separate occasions (double data entry). During the second typing (verification) the data values were compared with those typed on the earlier occasion, and any discrepancies were resolved before verification continued. This procedure also set out how to handle situations where the written records were illegible or ambiguous. This procedure avoided visual checking of data, which can be very inaccurate. Once the data were entered into e-RA, they were independently back-checked against the original data sheets.

Individual sub-plot data can be accessed from the BKYIELD dataset in the e-RA database.

For further information and assistance, please contact the e-RA curators, Sarah Perryman and Margaret Glendining using the e-RA email address: era@rothamsted.ac.uk