The headquarters of Percy Farms, the in-hand arable enterprise at Northumberland Estates, is at Ratcheugh Farm near Alnwick. Operating with a seven mile radius, farm manager, Stephen Siddorn looks after 3,660 arable acres (1,481 ha) with cropping including winter wheat and barley, oilseed rape and spring beans. Conservation and farming work hand in hand throughout, with an award winning grey partridge conservation project covering around 80 percent of the arable acreage. In addition much the farmland has been entered into conservation schemes such as Entry Level Stewardship (ELS) and Higher Level (HLS) Stewardship agreements. This, however, does not preclude the use of new technology within the farming enterprise, which utilises GPS mapping systems to ensure accuracy when applying sprays and fertilizer, and yield and soil mapping to assist in the accurate application of lime, phosphate and other additives.