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Regrowth characteristics of an S. 23 perennial ryegrass sward defoliated at early stages of reproductive development

Published online by Cambridge University Press:  27 March 2009

Ieuan Davies
Ieuan Davies
Affiliation:
Welsh Plant Breeding Station, Aberystwyth
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Summary

Patterns of stem development in late spring/summer regrowths after initial cuts at three growth stages are described. The stages at which the initial cuts were taken were: (a) before stem apices were raised to defoliation level (5 cm), (b) two weeks later when the apices of about 90% of the stem tillers were raised above this height, and (c) four weeks after (a), when the apices of all stem tillers were raised well above cutting height.

Following an initial cut at stage (a) stem development was quickly resumed, the most advanced tillers being devoid of leaf blades. After initial cuts at the later stages there was virtually no stem development until after the fourth week of regrowth.

The greater proportion of stem tillers in the earlier regrowth was not reflected in reduced digestibility during the first six weeks from cutting.

Reproductive (apical) development was generally weak in tillers in which stems developed in midsummer (after cutting at stages b and c); at least two-thirds of these tillers were indeterminate.

The significance of the distinct batch of stem tillers developing in spring is discussed, and the data are also considered in relation to (i) avoiding stemmy regrowths in spring, (ii) stem development and herbage quality, and (iii) summer stem extension and the perennation of the sward.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 80 , Issue 1 , February 1973 , pp. 1 - 10
Copyright
Copyright © Cambridge University Press 1973

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References

Bommer, D. (1966). Physiologie der Blütenbildung bei Futtergräsern. Futterpflanzen-Saatguterzeugung. (4. Leipziger Grünland Symposium, March 1966) Karl-Marx Universität, Leipzig, 1966, pp. 84–101.Google Scholar
Brockman, J. S. (1966). The growth rate of grass as influenced by fertilizer nitrogen and stage of defoliation. Prox. X. int. Grassld Congr., Helsinki, pp. 234–40.Google Scholar
Chouard, P. (1960). Vernalization and its relations to dormancy. A. Rev. Pl. Physiol. 11, 191–238.CrossRefGoogle Scholar
Cooper, J. P. (1957). Developmental analysis of populations in the cereals and herbage grasses. II. Response to low-temperature vernalization. J. agric. Sci., Camb. 49, 361–83.CrossRefGoogle Scholar
Cooper, J. P. (1960). Short day and low-temperature induction in Lolium. Ann. Bot. N.S. 24, 232–46.CrossRefGoogle Scholar
Davies, I. (1969). The influence of management on tiller development and herbage growth. Tech. Bull. No. 3. Welsh Pl. Breed. Stn, Aberystwyth, pp. 121.Google Scholar
Davies, I. (1972). The pattern of reproductive development and the leafiness of spring and early summer regrowths in two contrasting varieties of ryegrass. J. agric. Sci., Camb. 78, 27–37.CrossRefGoogle Scholar
Lambert, D. A. & Jewiss, O. R. (1970). The position in the plant and the date of origin of tillers which produce inflorescences. J. Br. Grassld Soc. 25, 107–12.CrossRefGoogle Scholar
Langer, R. H. M. (1959). Growth and nutrition of timothy (Phleum pratense L.) 5. Growth and flowering at different levels of nitrogen. Ann. appl. Biol. 47, 740–51.CrossRefGoogle Scholar
Lindsey, K. E. & Peterson, M. L. (1964). Floral induction and development in Poa pratenais L. Crop Sci. 4, 540–44.CrossRefGoogle Scholar
McCown, R. L. & Peterson, M. L. (1964). Effects of low temperature and age of plant on flowering in Lolium perenneL. Crop Sci. 4, 388–91.CrossRefGoogle Scholar
Minson, D. J., Raymond, W. F. & Harris, C. E. (1960). Studies in the digestibility of herbage. VIII. The digestibility of S. 37 cocksfoot, S. 23 ryegrass and S. 24 ryegrass. J. Br. Grassld Soc. 15, 174–80.CrossRefGoogle Scholar
Phillips, I. D. J. (1969). Apical dominance. In The Physiology of Plant Growth and Development. Ed. Wilkins, M. B.. McGraw-Hill, pp. 165–202.Google Scholar
Sachs, R. M. (1965). Stem elongation. A. Rev. Pl. Physiol. 16, 73–96.CrossRefGoogle Scholar