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Co-ordination of stem elongation and Zadoks growth stages with leaf emergence in wheat and barley

Published online by Cambridge University Press:  27 March 2009

E. J. M. Kirby ,
M. Appleyard  and
N. A. Simpson
E. J. M. Kirby
Affiliation:
147 Shelford Road, Cambridge CB2 2ND, UK
M. Appleyard
Affiliation:
Hyde Hall, Great Fransham, Dereham, Norfolk NR19 2HR, UK
N. A. Simpson
Affiliation:
ADAS, Chequers Court, Huntingdon PEI8 6LT, UK
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Summary

Leaf emergence, apex development stage, internode length and Zadoks principal growth stage 3 were measured over 3 years at several sites.

Internode elongation and Zadoks score were strongly related to the number of emerged culm leaves. The final length of the most basal internode was very variable and contributed to variation in the relationship between Zadoks stage 30 and the number of emerged culm leaves. Variation in the length of the basal internode was related to the final number of culm leaves. Most plants had six culm leaves but the number of leaves was affected by sowing date. In an experiment where sowings were made from September to March, stem elongation and Zadoks stage 30 started at a later stage of apex development in later sowings.

Recognition and prediction of culm elongation and number of emerged culm leaves is important for the application of growth regulator and fungicides. Combined with functions to predict the rate of leaf emergence and final number of leaves, the relationships described in this paper may enable Zadoks principal growth stage 3 and number of emerged culm leaves to be predicted.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 122 , Issue 1 , February 1994 , pp. 21 - 29
Copyright
Copyright © Cambridge University Press 1994

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