Table 1.

Sources and details of farm management and environmental data about UK dairy herds (n=606)

Variable	Available for	Resolution	Source	Date
Climate
Raindays >1mm 5 year mean for MJJ and ASOa	All farms	5 km grid	Met Officeb	2007–2011
Rainfall 5 year mean for MJJ, ASO, NDJ	All farms	5 km grid	Met Officeb	2007–2011
Min Temp 5 year mean FMA, MJJ, NDJ	All farms	5 km grid	Met Officeb	2007–2011
Max Temp 5 year mean FMA, MJJ, NDJ	All farms	5 km grid	Met Officeb	2007–2011
Land quality
Average slope of land in degrees	All farms	1 km grid	CEH CISc	1995
Altitude	All farms	1 km grid	CEH CISc	1995
Improved grassland	All farms	1 km grid	CEH CISc	2000
ALC Grade	England only (485 farms)	<50 m	Natural Englandd	1988
Soil
pH	England and Wales (544 farms)	5 km grid	NSRI LandISe	1983
Iron (Fe)	England and Wales (544 farms)	5 km grid	NSRI LandISe	1983
Phosphorus (P)	England and Wales (544 farms)	5 km grid	NSRI LandISe	1983
Very fine sand (soil texture)	England and Wales (544 farms)	5 km grid	NSRI LandISe	1983

^aFMA, MJJ, ASO and NDJ refer to 3 month periods of February, March, April; May, June, July; etc.

^bUK Meteorological Office (www.metoffice.gov.uk/climatechange/science/monitoring/ukcp09).

^cCentre for Ecology and Hydrology Countryside Information System (CEH CIS) (www.ceh.ac.uk/products/software/CEHSoftware-CIS.htm).

^dNatural England (www.gis.naturalengland.org.uk).

^eNational Soil Research Institute Land Information System (NSRI LandIS) (http://www.cranfield.ac.uk/sas/nsri).