Identification

Title

Wheat yield resilience metrics for sample 10km x 10km grid cells in England, 2008-2017

Abstract

Data on resilience of wheat yields in England, derived from the annual Defra Cereals and Oilseeds production survey of commercial farms. The data presented here are summarised over a ten-year time-series (2008-2017) at 10km x10km grid cell (hectad) resolution. The data give the mean yield, relative yield, yield stability and resistance to an extreme event (the poor weather of 2012), for all hectads with at least one sampled farm holding in each year of the time-series (i.e. the minimum data required to calculate the resilience metrics). These metrics were calculated to explore the impact of landscape structure on yield resilience. The data also give the number of samples per year per hectad, so that sampling biases can be explored and filtering applied. No hectads are included that contain data from <9 holdings across the time series (the minimum level required by Defra to maintain anonymity is <5). The data were created under the ASSIST (Achieving Sustainable Agricultural Systems) project by staff at the UK Centre for Ecology & Hydrology to enable exploration of the impacts of agriculture on the environment and vice versa, enabling farmers and policymakers to implement better, more sustainable agricultural practices. Full details about this dataset can be found at https://doi.org/10.5285/7dbcee0c-00ca-4fb2-93cf-90f2a5ca37ea

Resource type

dataset

Resource locator

https://data-package.ceh.ac.uk/data/7dbcee0c-00ca-4fb2-93cf-90f2a5ca37ea

name: Download the data

description: Download a copy of this data

function: download

https://data-package.ceh.ac.uk/sd/7dbcee0c-00ca-4fb2-93cf-90f2a5ca37ea.zip

name: Supporting information

description: Supporting information available to assist in re-use of this dataset

function: information

Unique resource identifier

code

https://catalogue.ceh.ac.uk/id/7dbcee0c-00ca-4fb2-93cf-90f2a5ca37ea

codeSpace

doi:

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

environment

farming

Keywords

Keyword set

keyword value

Land Use

originating controlled vocabulary

title

GEMET - INSPIRE themes, version 1.0

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Geographic location

West bounding longitude

-6.452

East bounding longitude

1.768

North bounding latitude

55.812

South bounding latitude

49.864

Temporal reference

Temporal extent

Begin position

2008-01-01

End position

2017-12-31

Dataset reference date

date type

publication

effective date

2020-07-07

Frequency of update

Quality and validity

Lineage

The original yield data were collected by Defra using a survey of a stratified random sample of farm holdings, as part of the annual June census of the English agricultural industry. Data were available for 10 years (2008-2017), comprising average winter wheat yield per holding and coordinates locating each to 1km. UKCEH obtained these data under a confidentiality agreement with Defra. Data were cleaned to remove anomalous yield values (zero values, whole crop silage harvests and obvious outliers). Because a new random sample of farm holdings is drawn each year, few had consecutive data across 10 years. To analyse yield variation over time and account for local spatial variation in farming practices data were therefore aggregated to mean annual yield per 10km x 10km Ordnance Survey grid cell (‘hectad’). This also preserves survey respondent anonymity by ensuring that no yield value can be attributed to the location of a single holding (a condition of use for the original Defra survey data, in line with the Agricultural Statistics Act 1979). Resilience metrics were then calculated across the time series (see below). Data included here give these metrics for 315 hectads with at least one sampled holding in each year of the time-series (i.e. the minimum data required to calculate the resilience metrics), although further analyses used only 137 that were deemed to be sufficiently well-sampled to avoid biases relating to sample size. This was based on thresholds for the minimum permissible number of samples per year and the number of years permitted to have this value, to determine which combination retained the maximum number of samples whilst removing the significant correlations between sample size and mean yield and between mean sample size and mean yield over time. A threshold value of no more than one year with a single sample and no more than two years having less than three samples was found to meet achieve this.

Conformity

Conformity report

specification

title

Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

reference date

date type

publication

effective date

2010-12-08

degree

explanation

Data format

name of format

Comma-separated values (CSV)

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

Constraint set

Limitations on public access

© UK Centre for Ecology & Hydrology, Defra

Constraint set

Limitations on public access

Users of the data must include the following acknowledgement: Data has been derived from Defra Cereals and Oilseeds Production Survey by UKCEH with the explicit permission of the Department for the Environmental Food and Rural Affairs

Constraint set

Limitations on public access

If you reuse this data, you should cite: Redhead, J.W., Oliver, T.H., Woodcock, B.A., Pywell, R.F. (2020). Wheat yield resilience metrics for sample 10km x 10km grid cells in England, 2008-2017. NERC Environmental Information Data Centre https://doi.org/10.5285/7dbcee0c-00ca-4fb2-93cf-90f2a5ca37ea

Responsible organisations

Responsible party

organisation name

UK Centre for Ecology & Hydrology

email address

enquiries@ceh.ac.uk

responsible party role

author

Responsible party

organisation name

University of Reading

email address

t.oliver@reading.ac.uk

responsible party role

author

Responsible party

organisation name

UK Centre for Ecology & Hydrology

email address

enquiries@ceh.ac.uk

responsible party role

author

Responsible party

organisation name

UK Centre for Ecology & Hydrology

email address

enquiries@ceh.ac.uk

responsible party role

author

Responsible party

organisation name

UK Centre for Ecology & Hydrology

email address

enquiries@ceh.ac.uk

responsible party role

pointOfContact

Responsible party

organisation name

NERC EDS Environmental Information Data Centre

email address

info@eidc.ac.uk

responsible party role

custodian

Responsible party

organisation name

NERC Environmental Information Data Centre

email address

info@eidc.ac.uk

responsible party role

publisher

Responsible party

organisation name

UK Centre for Ecology & Hydrology

email address

enquiries@ceh.ac.uk

responsible party role

owner

Metadata on metadata

Metadata point of contact

organisation name

Environmental Information Data Centre

full postal address

Lancaster Environment Centre, Library Avenue, Bailrigg

Lancaster

LA1 4AP

UK

email address

info@eidc.ac.uk

responsible party role

pointOfContact

Metadata date

2022-05-18T13:09:33

Metadata language

eng