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An analysis of morphological development stages in avalon winter wheat crops with different sowing dates and at ten sites in England and Scotland

  • J. R. Porter (a1), E. J. M. Kirby (a2), W. Day (a3), Jill S Adam (a1), Margaret Appleyard (a2), Sarah Ayling (a4), C. K. Baker (a5), P. Beale (a6), R. K. Belford (a4), P. V. Biscoe (a7), Anne Chapman (a8), M. P. Fuller (a8), Janice Hampson (a9), R. K. M. Hay (a9), M. N. Hough (a6), S. Matthews (a10), W. J. Thompson (a10), A. H. Weir (a3), V. B. Anne Willington (a7) and D. W. Wood (a3)...


An experiment to measure the variation in the phenological and apical development ofwinter wheat (cv. Avalon) in England and Scotland is described. Ten sites which ranged from Aberdeen (57·2° N), the most northerly, to Newton Abbot (50·6° N), the most southerly, were included in the survey, and at each site seed was hand-sown in mid-September, October and November 1983. Developmental stages and sampling procedures were precisely defined to ensure uniformity in scoring by the observers at each site. Temperatures during the growing season were in line with the long-term means, though spring was cooler at all sites and summer warmer at most. The range of monthly-mean temperatures between sites was about the same as the difference between consecutive months. The method of analysis of development rates and durations was in terms of thermal time, modified by sensitivity to photoperiod and a vernalization requirement that slowed early development until a number of days of low temperatures had been experienced. In general, crops at northern sites developed more slowly than those in the south and particularly the south-west of England. There was less variation in the timing of apical stages for later sowings. Developmental rates responded linearly to temperature and photoperiod, with the base temperature increasing for later phases of development. The effect of photoperiod in modifying the rate of development was apparent for all developmental phases from emergence to anthesis, longer days accelerating development, but there was no effect on the duration of the grain-filling period. Vernalization exerted its effect solely within the phase from emergence to double ridge, and had a major influence on the variation between sites only for the first sowing.



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