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Comparative rates of emergence and leaf appearance in wild oats (Avena fatua), winter barley (Hordeum sativum) and winter wheat (Triticum aestivum)

Published online by Cambridge University Press:  27 March 2009

R. D. Cousens
Affiliation:
AFRC Institute of Arable Crops Research, Long Ashton Research Station, Bristol, Avon BS18 9AF, UK
M. P. Johnson
Affiliation:
AFRC Institute of Arable Crops Research, Long Ashton Research Station, Bristol, Avon BS18 9AF, UK
S. E. Weaver
Affiliation:
Agriculture Canada, Research Station, Harrow, Ontario, N0R 1G0, Canada
T. D. Martin
Affiliation:
AFRC Institute of Arable Crops Research, Brooms Barn Experimental Station, Higham, Bury St Edmunds, Suffolk IP28 6NP, UK
A. M. Blair
Affiliation:
AFRC Institute of Arable Crops Research, Brooms Barn Experimental Station, Higham, Bury St Edmunds, Suffolk IP28 6NP, UK

Summary

Winter barley cv. Igri, winter wheat cv. Avalon and spring wild oats (Avena fatua) were studied in monocultures in pots and in the field. The field experiments were located near Bristol and Bury St Edmunds in 1988/89. Pot sowings were monthly, whereas there was a single sowing date for each of the two field locations. Base temperatures for emergence in pots were 2·2, 1·3 and 2·3 °C for barley, wheat and A. fatua respectively. Barley was consistently the fastest to emerge. Leaf number was strongly correlated with photothermal time from emergence, with barley producing leaves at the greatest rate. Base temperatures for leaf appearance were −6, −5 and −3 °C for barley, wheat and A. fatua respectively. The field studies confirmed the ranking of the species based on the pot experiments. Both a model based on photothermal time and one based on rate of change of daylength at emergence gave good descriptions of the data. It is argued that correlations of rates of development with individual environmental variables are not sufficient to deduce the underlying mechanisms.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1992

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