Table 4: Data available* as Open Access Datasets in e-RA, September 2017 http://www.era.rothamsted.ac.uk/open_access

From: The electronic Rothamsted Archive (e-RA), an online resource for data from the Rothamsted long-term experiments

Dataset Description Dates Comments
Broadbalk: winter wheat since autumn 1843: wheat in rotation with other crops since 1968
 Broadbalk Yields(Data Citation 1: Rothamsted Research https://doi.org/10.23637/KeyRefOABKyields) Mean long-term wheat yields from selected treatments Continuous wheat: 1852–2016 Wheat in rotation: 1968–2016 Widely used to demonstrate effects of FYM and fertilizers, improved cultivars and pest control on yield
 Broadbalk soil organic carbon (SOC)(Data Citation 2: Rothamsted Research https://doi.org/10.23637/KeyRefOABKsoc) Long-term changes in SOC in topsoil (0-23 cm) from selected treatments Continuous wheat sections only: 1843–2010 Includes % SOC, measured soil weights and calculated SOC, tha−1
 Broadbalk soil Olsen P concentration(Data Citation 3: Rothamsted Research https://doi.org/10.23637/KeyRefOABKolsenP) Long-term changes in Olsen P in topsoil (0–23 cm) 1843–2010, selected treatments A measure of plant-available P
Hoosfield: spring barley since 1852
 Hoosfield Yields(Data Citation 4: Rothamsted Research https://doi.org/10.23637/KeyRefOAHByields) Mean long-term barley yields from selected treatments 1852–2015 Shows long-term changes in yield due to improved cultivars, pest control, FYM and fertilizers.
 Hoosfield SOC(Data Citation 5: Rothamsted Research https://doi.org/10.23637/KeyRefOAHBsoc) Long-term changes in SOC in topsoil (0-23cm) from selected treatments 1852–1998 Includes % SOC, measured soil weights and calculated SOC, tha−1
Park Grass: permanent grassland since 1856, usually cut twice a year
 Park Grass species diversity(Data Citation 6: Rothamsted Research https://doi.org/10.23637/KeyRefOAPGspecies) Effect of selected fertilizer treatments, with and without chalk, on number of species 1864–2011 Number of species comprising 1% or more of the above-ground biomass.
 Park Grass soil pH(Data Citation 7: Rothamsted Research https://doi.org/10.23637/KeyRefOAPGsoilpH) Long-term changes in soil pH (in water) from selected treatments 1856–2011 Shows acidification of soil due to fertilizer use and atmospheric deposition, and effect of liming
Wilderness sites: two contrasting former arable sites which reverted to woodland in the 1880s
 Broadbalk Wilderness accumulation of organic carbon in soil and trees(Data Citation 8: Rothamsted Research https://doi.org/10.23637/KeyRefOABKWoc) Accumulation of biomass on a calcareous soil left to revert to woodland since 1882 Broadbalk Wilderness: 1881–1999. Data on t C ha−1 accumulated in soil, litter, root and above-ground biomass (trees)
 Geescroft Wilderness accumulation of organic carbon in soil and trees(Data Citation 9: Rothamsted Research https://doi.org/10.23637/KeyRefOAGEWoc) Accumulation of biomass on an acidic soil left to revert to woodland since 1883 Geescroft Wilderness: 1883–1999. Data on t C ha−1 accumulated in soil, litter, root and above-ground biomass (trees)
Rothamsted meteorological data
 Mean annual temperature at Rothamsted(Data Citation 10: Rothamsted Research https://doi.org/10.23637/KeyRefOARESmatemp) Mean annual air temperature and five-year mean. 1878–2013 The mean annual temperature is now 1 °C higher than the 1878–1987 average.
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