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Effects of nitrogen supply and drought on early development of winter wheat in the field in Eastern England

Published online by Cambridge University Press:  27 March 2009

G. N. Thorne
Affiliation:
AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Hertfordshire, A L5 2JQ
D. W. Wood
Affiliation:
AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Hertfordshire, A L5 2JQ
H. J. Stevenson
Affiliation:
AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Hertfordshire, A L5 2JQ

Summary

Development was studied in winter wheat sown after rape or after oats in September 1984, 1985 and 1986, and in October 1985. N03-N residues from rape in October exceeded those from oats by 60, 50 and 40 kg N/ha respectively in the 3 years. Previous crops affected development only in the 1984–5 season. The first 12 apical primordia were initiated faster after rape; thereafter rates were similar, wheat after rape having two more primordia than wheat after oats. Final numbers of leaves and spikelets were each increased by one. The first five leaves appeared faster after rape so that from December onwards the number of emerged leaves was one more after rape than after oats. The double ridge and terminal spikelet stages occurred 8 and 4 days respectively earlier after rape than after oats. Development was unaffected by N fertilizer applied in November or at various times from February onwards, although growth and N uptake were increased. Drought during autumn 1985 delayed emergence of the September-sown wheat and slowed the rates of initiation of the first ten primordia and appearance of the first four leaves. Consequently the number of shoots per plant in December was only about three cf. six in the other 2 years.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1988

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