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The implications of a changing climate on agricultural land classification in England and Wales

  • C. A. KEAY (a1), R. J. A. JONES (a1), J. A. HANNAM (a1) and I. A. BARRIE (a2)


The agricultural land classification (ALC) of England and Wales is a formal method of assessing the quality of agricultural land and guiding future land use. It assesses several soil, site and climate criteria and classifies land according to whichever is the most limiting. A common approach is required for calculating the necessary agroclimatic parameters over time in order to determine the effects of changes in the climate on land grading. In the present paper, climatic parameters required by the ALC classification have been re-calculated from a range of primary climate data, available from the Meteorological Office's UKCP09 historical dataset, provided as 5 km rasters for every month from 1914 to 2000. Thirty-year averages of the various agroclimatic properties were created for 1921–50, 1931–60, 1941–70, 1951–80, 1961–90 and 1971–2000. Soil records from the National Soil Inventory on a 5 km grid across England and Wales were used to determine the required soil and site parameters for determining ALC grade. Over the 80-year period it was shown that the overall climate was coolest during 1951–80. However, the area of land estimated in retrospect as ‘best and most versatile (BMV) land’ (Grades 1, 2 and 3a) probably peaked in the 1951–80 period as the cooler climate resulted in fewer droughty soils, more than offsetting the land which was downgraded by the climate being too cold. Overall there has been little change in the proportions of ALC grades among the six periods once all 10 factors (climate, gradient, flooding, texture, depth, stoniness, chemical, soil wetness, droughtiness and erosion) are taken into account. This is because it is rare for changes in climate variables all to point in the same direction in terms of ALC. Thus, a reduction in rainfall could result in higher grades in wetter areas but lead to lower classification in drier areas.


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Allen, R. G., Periera, L. S., Raes, D. & Smith, M. (1998). Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO Irrigation and Drainage Paper 56. Rome: FAO.
CEC (1986). Council Directive 86/278/EEC of 12 June 1986 on the protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture. Official Journal of the European Communities L181, 00060012.
DoE (1996). Department of the Environment. Code of Practice for Agricultural Use of Sewage Sludge. London: DoE Publications.
Field, M. (1983). Creating the ‘Complete’ Agromet Dataset. Meteorological Office Agricultural Memorandum No. 983. London: The Meteorological Office.
Hallett, S. H. & Jones, R. J. A. (1993). Compilation of an accumulated temperature database for use in an environmental information system. Agricultural and Forest Meteorology 63, 2134.
Harvey, L. (1983). Extending the ‘Complete’ Agromet Data-set. Meteorological Office Agricultural Memorandum No. 983A. London: The Meteorological Office.
Hess, T. M. (2000). WaSimET – Reference Evapotranspiration Program [V1·3]. Silsoe, UK: Cranfield University. Available from (accessed 30 August 2012).
Hodgson, J. M. (1976). Soil Survey Field Handbook. Technical Monograph No. 5. Harpenden, UK: Soil Survey.
Jones, R. J. A. (1985). The soil survey's field capacity dataset – an aid to assessing soil wetness. Soil Survey and Land Evaluation 5, 112.
Jones, R. J. A. & Thomasson, A. J. (1985). An Agroclimatic Databank for England and Wales. Technical Monograph No. 16. Harpenden, UK: Soil Survey.
MAFF (1966). Agricultural Land Classification. Technical Report No. 11, Ministry of Agriculture, Fisheries and Food. London: Agricultural Land Service.
MAFF (1988). Agricultural Land Classification of England and Wales. Revised Guidelines and Criteria for Grading the Quality of Agricultural Land. London: Ministry of Agriculture, Fisheries and Food.
McGrath, S. P. & Loveland, P. J. (1992). The Soil Geochemical Atlas of England and Wales. London: Blackie Academic and Professional.
Meteorological Office (1969). Tables for the Evaluation of Daily Values of Accumulated Temperature Above and Below 42 degrees F from Daily Values of Maximum and Minimum Temperature. Meteorological Office Leaflet No. 10. Bracknell, UK: The Meteorological Office.
Meteorological Office (1989). Climatological Data for Agricultural Land Classification. London: The Meteorological Office.
Meteorological Office (2006). UKCP09: Monthly Data Sets. London: The Meteorological Office. Available online at: (accessed 31 August 2010).
ODPM (2004). Planning Policy Statement 7: Sustainable Development in Rural Areas. London: HMSO.
Perry, M. & Hollis, D. (2005 a). The development of a new set of long-term climate averages for the UK. International Journal of Climatology 25, 10231039.
Perry, M. & Hollis, D. (2005 b). The generation of monthly gridded datasets for a range of climatic variables over the UK. International Journal of Climatology 25, 10411054.
Ragg, J. M., Jones, R. J. A. & Proctor, M. E. (1988). The refinement and representation of spatial data in an information system using statistical and DBMS procedures, and trend surface analysis. Geologische Jahrbuch A104, 295308.
Robson, J. D. & Thomasson, A. J. (1977). Soil Water Regimes. A Study of Seasonal Waterlogging in English Lowland Soils. Technical Monograph No. 11. Harpenden, UK: Soil Survey.
Smith, L. P. (1967). Potential Transpiration for use in Irrigation and Hydrology in the United Kingdom and Republic of Ireland. Technical Bulletin No. 16, Ministry of Agriculture, Fisheries and Food. London: HMSO.
Smith, L. P. (1971). The Significance of Winter Rainfall over Farmland in England and Wales: an Analysis of the Dates of Return to Field Capacity and Subsequent Winter Rainfall during the Years 1940–59 and 1968–69. Technical Bulletin 24, Ministry of Agriculture, Fisheries and Food. London: HMSO.
Smith, L. P. (1976). The Agricultural Climate of England and Wales. Areal Averages 1941–70. Technical Bulletin 35, Ministry of Agriculture, Fisheries and Food. London: HMSO.
Thomasson, A. J. (1979). Assessment of soil droughtiness. In Soil Survey Applications (Eds Jarvis, M. G. & Mackney, D.), pp. 4350. Technical Monograph No. 13. Harpenden, UK: Soil Survey.
Thompson, N., Barrie, I. A. & Ayles, M. (1981). The Meteorological Office Rainfall and Evaporation Calculation System: MORECS. Hydrological Memo. No. 45. Bracknell, UK: The Met Office.
Veihmeyer, F. J. & Hendrickson, A. H. (1931). The moisture equivalent as a measure of the field capacity of soils. Soil Science 32, 181193.

The implications of a changing climate on agricultural land classification in England and Wales

  • C. A. KEAY (a1), R. J. A. JONES (a1), J. A. HANNAM (a1) and I. A. BARRIE (a2)


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