Last updated 12/12/2012
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YOU MUST CITE AS: Rothamsted Research (2012). Hoosfield soil organic carbon content. Electronic Rothamsted Archive https://doi.org/10.23637/KeyRefOAHBsoc.
Click the chart above for a PDF version. Data used for this chart and information on treatments, are available to download as an Excel Spreadsheet Soil organic carbon and treatments.
This selected data is from Johnston et al. (2009). The complete dataset is available from the e-RA curators.
The figure shows changes in soil organic carbon (SOC) content (tha-1) in the topsoil (0-23cm) of selected treatments of the Hoosfield experiment, where spring barley has been grown each year since 1852. Data has been calculated from measured % SOC (0-23 cm) and standard soil weights, adjusted for observed decreases in top soil bulk density of plots given FYM, by including the appropriate amount of subsoil to ensure soil weights were comparable over time. SOC has remained almost constant in the unfertilized plot since the 1880s, at the equilibrium level for this farming system on this soil type. Annual applications of 35 t ha-1 FYM increased SOC rapidly at first, then more slowly. This treatment now contains around three times as much SOC as the unfertilized plot. The third treatment, given FYM for just 20 years between 1852 and 1871, still contains over 40% more SOC than the unfertilized plot.
CROPPING AND TREATMENTS
Unfertilized: No fertilizer or organic manure since 1852.
FYM: 35 t ha-1 FYM each year since 1852.
FYM 1852-1871: 35 t ha-1 FYM each year since 1852.
Spring barley grown every year, except 1912, 1933, 1943 and 1967 when the whole experiment was fallowed to control weeds.
For further information about the experiment, see Hoosfield Spring Barley Experiment and the Key References below.
Further details can be obtained from the e-RA curators and the Rothamsted Guide to the Classical Experiments (2006), pages 31-34.