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 silty clay loam soil at Rothamsted Experimental Farm, Harpenden, from 1962-1996. Archived topsoil samples from six years between 1964 and 1989 were re-analysed in 2019 for a range of soil exchangeable cations, by extraction with ammonium nitrate (NH4NO3). There was a parallel experiment at Woburn Experimental Farm.
Period 1 (1962-1980): four lime levels with and without fertilizer P and K. Period 2 (1981-1996): four lime levels with four P levels. 2 replicates (blocks).
Detection limits (DL) of the ICP-OES. These values provide an indication of the lower values for detection by the ICP-OES. DL (mg/kg dry soil) is calculated as 3x standard deviation of blanks.
Al | Ca | Cu | Fe | K | Mg | Mn | Na | Zn | |
---|---|---|---|---|---|---|---|---|---|
DL | 0.33 | 1.43 | 0.02 | 0.23 | 3.18 | 0.21 | 0.06 | 0.76 | 0.02 |
Rothamsted Research
This dataset is available under a Creative Commons Attribution Licence (4.0).
YOU MUST CITE AS: Cathy Thomas, Jonathan Holland, Margaret Glendining, Stephan Haefele (2023). Dataset: Rothamsted long-term liming experiment exchangeable cations re-analysed Electronic Rothamsted Archive, Rothamsted Research https://doi.org/10.23637/rcs10-rltlcation-01
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Note the included Excel file: 01-RLTLCATION.xlsx contains the same data as the below CSV files. The Excel file contains each of the below CSV files as an Excel worksheet and is provided for users who prefer Excel over CSV.
File | Dataset Name | Description |
---|---|---|
soil_data.csv | Soil data | The main data table containing soil exchangeable cation data for archived soil sampled in 1964, 1967, 1974, 1979, 1983 and 1989, re-analysed in 2019. Topsoil was analysed from all plots and sub-plots (where present), except sub-plots given Mg in 1974-1978. Exchangeable cation extraction by ammonium-nitrate method. Cations were detected by ICP-OES. Any negative values were converted to zero. |
liming_factor_data.csv | Liming treatment factor level descriptions | Describes the different liming treatment factor levels used, 1962-1996. |
p_factor_data.csv | P treatment factor level descriptions | Describes the different P treatment factor levels used, 1962-1996. |
k_factor_data.csv | K treatment factor level descriptions | Describes the different K treatment factor levels used, 1962-1980. From 1981 basal K was applied to all plots. |
detection_limit_data.csv | Detection limit data | Describes the limits of detection of the ICP-OES for each cation. |
notes_data.csv | Notes | Additional explanatory notes for records in the soil_data table |
The original archived soil samples were stored in the Rothamsted Sample Archive. The chemical analysis was carried out in the Analytical Unit of Rothamsted Research in 2019.
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.
This experiment was under grass from 1997-2019 and no treatments were applied. In April 2019 the experiment was revived, and is currently being used to investigate the effect of different lime, P and Zn treatments on macro and micro nutrient uptake of wheat varieties. For more details contact Dr SM Haefele.
This project received specific funding from the following sources
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