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Yield of Wheat in the United Kingdom

Recent Advances and Prospects

^a 15 Wingate Way, Trumpington, Cambridge, CB2 2HD, UK

View larger version (16K): [in a new window]   Fig. 1 United Kingdom wheat yields since 1948 vs. year, from the UK Ministry of Agriculture, Fisheries and Food. Linear regression coefficient of best fit is 0.1097 t ha-1 yr-1 (R2 = 0.91)

View larger version (13K): [in a new window]   Fig. 2 Fertilizer N applied to wheat in the UK since 1968, from British Survey of Fertilizer Practice

View larger version (17K): [in a new window]   Fig. 3 Yield at Nopt vs. year of first entry into National List trials. Linear regression coefficient of best fit is 0.096 t ha-1 yr-1 (R2 = 0.46). Redrawn from Foulkes et al. (1998)

View larger version (17K): [in a new window]   Fig. 4 Optimum N amount (Nopt) vs. year of first entry into National List trials. Linear regression coefficient of best fit is 2.82 kg ha-1 yr-1 (R2 = 0.37). Redrawn from Foulkes et al. (1998)

View larger version (16K): [in a new window]   Fig. 5 United Kingdom wheat yields and average yields from National Institute of Agricultural Botany trials since 1981 vs. years, from the UK Ministry of Agriculture, Fisheries and Food and National Institute of Agricultural Botany, Cambridge

View larger version (22K): [in a new window]   Fig. 6 A summary of results from UK Recommended List trials since 1981: (a) percentage of entries which yielded more than controls (b) percentage by which good entries outyielded controls

View larger version (18K): [in a new window]   Fig. 7 Grain yield vs. plant height for four series of Rht dwarf isolines Maris Huntsman, Bersee, Widgeon, and April Bearded. Each point is a mean across six replicates and six trials. Redrawn from Flintham et al. (1997)