The experiment tests the effects of different amounts of lime (and thus soil pH), P and K on a sequence of arable crops, on a sandy soil at Woburn Experimental Farm, from 1962-1996. Mg, Mn and S were tested on split plots at different times. Target soil pH was 4.5, 5.5, 6.5 and 7.5. This dataset contains soil pH, Olsen P and exchangeable cations (Ca, K, Mg and Na). There is a parallel experiment at Rothamsted Experimental Farm. The experiment was discontinued in 1997.
Period 1 (1962-1980): four lime levels with and without fertilizer P and K. Magnesium was tested on split plots 1974-1978. Period 2 (1981-1996): four lime levels with four P levels. Manganese was tested on split plots 1987-1990; Sulphur was tested on split plots 1991-1996. There are two replicates.
Air-dried soil, sieved (<2mm). Topsoil (usually 0-23cm) and some sub-soil measurements. For topsoil 12-20 cores were taken from the central area of each plot and combined to make one sample. For subsoil, generally 5-6 cores were taken and combined. Baseline soil pH measurements were taken in February 1962, before the first lime application. Soil samples were generally taken in the autumn, after the current crop was harvested and before the soil was ploughed for the next harvest year, so that the soil properties could be related to the treatments applied in the previous harvest year.
This dataset is available under a Creative Commons Attribution Licence (4.0).
YOU MUST CITE AS: Margaret Glendining, Jonathan Holland, Steve McGrath, Keith Goulding (2023). Dataset: Woburn long-term liming experiment soil chemical properties 1962-1996 Electronic Rothamsted Archive, Rothamsted Research https://doi.org/10.23637/wcs10-wltlsoil-01
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An Excel file, 01-WobLTliming-soil.xlsx, contains soil pH, Olsen P (plant-available soil P) and exchangeable cations (Ca, K, Mg and Na) measured several times over the course of the experiment. Also included are details of the lime (chalk) applications and the different fertilizer treatments.
Frictionless CSV files are provided for users who prefer CSV over Excel files.
Information is taken from original raw data sheets and analysis files, held in the archives at Rothamsted Research. The data is derived from measurements made by the Analytical Chemistry Unit, Rothamsted Research, Harpenden.
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. The Analytical Chemistry Unit follows the Joint Code of Practice (JCoPR) and participates in European Quality Assurance programmes. All performance is strictly monitored using certified external standards alongside in-house standard materials. Standards and check samples are monitored and recorded.
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