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Physiological Processes Associated with Wheat Yield Progress in the UK

^a Division of Agricultural and Environmental Sciences, Univ. of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD, UK
^b ADAS Boxworth R & D Centre, Boxworth, Cambridgeshire CB3 8NN, UK

View larger version (32K): [in this window] [in a new window]   Fig. 1. Fitted linear (y = a + bx) or quadratic (y = a + bx + cx2) curves on year of release for (a) combine grain yield (15% moisture content), (b) grains per unit area, (c) ears per unit area, (d) grains per ear (no significant curve; SE of the difference of the means = 2.73, df = 28), (e) harvest aboveground dry matter (DM), and (f) harvest index. Fitted data were 2-yr means for eight cultivars released from 1972 to 1995.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Fungicide-treated grain yield against year of release for Group 3 (biscuit-making and export market) and Group 4 (feed market) cultivars (provisionally recommended or recommended for general use) on HGCA UK Recommended List (RL) 2004/05 (HGCA, 2004).