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Developmental characteristics of grass varieties in relation to their herbage production:6. Spring and summer growth of Sabrina hybrid ryegrass and RvP Italian ryegrass as influenced by the date of the initial cut in spring and the length of the succeeding growth period

Published online by Cambridge University Press:  27 March 2009

I. Davies
I. Davies
Affiliation:
Welsh Plant Breeding Station, Aberystwyth
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Summary

The yield and chemical composition of Sabrina hybrid ryegrass and RvP Italian ryegrass were compared, with special reference to regrowth after defoliation in spring and early summer. Initial cuts were taken on 6, 20 April and 4. and 18 May; subsequently a conservation crop was harvested at either 5 or 7 weeks, and a second regrowth 30 days later. There were four fertilizer treatments. Tiller density, stem development and individual tiller dry weight were recorded in selected treatments.

At the initial cuts and in the conservation crops after the first three initial cuts, varietal differences in yield and dry-matter digestibility (DMD) were relatively small. In all other harvests, RvP was appreciably higher yielding than Sabrina, and it showed greater responses to fertilizer in all second regrowth harvests. The water-soluble carbohydrate (WSC) content of RvP was consistently higher than that of Sabrina in regrowth harvests; the DMD was higher in Sabrina.

In primary growth of the two cultivars, tillering was suppressed at the time of head emergence, but active tillering was resumed earlier in RvP, the later-heading cultivar. In RvP, tillers arising early in the regrowth periods attained head emergence within 5 weeks. In Sabrina there was a marked decline in head production during June, and an increase in the size of individual vegetative tillers.

In regrowth harvests both the yield and the % WSC were markedly reduced when drought conditions were most severe; the most marked varietal differences occurred at this time, both in terms of yield of dry matter and % crude protein responses to fertilizer treatment.

In the two cultivars the DMD of 7-week conservation crops harvested in late May was at least equal to that of 5-week crops harvested later during drought conditions. A distinctly more advanced stage of development was attained in the earlier, heavieryielding crops.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 98 , Issue 1 , February 1982 , pp. 47 - 64
Copyright
Copyright © Cambridge University Press 1982

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References

REFERENCES

Agricultural Research Council. (1965). The Nutrient Requirements of Farm Livestock No. 2. Ruminants. London: Agricultural Research Council.Google Scholar
Breese, E. L., Thomas, P. T. & Hughes, R. (1971). Perspectives in grass breeding. Report of the Welsh Plant Breeding Station for 1970, pp. 70–76.Google Scholar
Davies, I. (1969). The influence of management on tiller development and herbage growth. Welsh Plant Breeding Station Technical Bulletin, no. 3.Google Scholar
Davies, I. (1973). Factors affecting leafiness in herbage grasses. In Evaluation of Breeding Material in Herbage Crops Report of Fodder Crops Meeting, Dublin. Eucarpia. 4–709 1972, pp. 55–73.Google Scholar
Deinum, B. (1966). Influence of some climatologioal factors on the chemical composition and feeding value of herbage. Proceedings of the Xth International Grassland Congress, Helsinki, pp. 415–418.Google Scholar
Hughes, R., Jones, E. L., Rushton, W. H. & Evans, W. B. (1977). Variety evaluation – reactions to water stress. Report of the Welsh Plant Breeding Station for 1976, pp. 36–44.Google Scholar
Hughes, R., Rushton, W. H., Jones, E. L. & Williams, I. G. (1973). Variety evaluation. Report of the Welsh Plant Breeding Station for 1972, pp. 53–55.Google Scholar
Hughes, R., Rushton, W. H., Jones, E. L. & Williams, I. G. (1974). Tetraploid ryegraas hybrids. Report of the Welsh Plant Breeding Station for 1973, pp. 40–41.Google Scholar
Jones, E. L. (1978). Variety evaluation; height of cut. Report of the Welsh Plant Breeding Station for 1977, pp. 50–51.Google Scholar
Jones, E. L. (1979). Variety evaluation; height of cut. Report of the Welsh Plant Breeding Station for 1978, pp. 61–62.Google Scholar
Miles, D. G., Walters, R. J. K. & Evans, E. M. (1969). Dry-matter intake and live-weight gain of cattle and sheep offered different grass varieties with and without clover. Animal Production 11, 19–28.Google Scholar
Minson, D. J. & Mcleod, M. N. (1970). The digestibility of temperate and tropical grasses. Proceedings of the Xlth International Grassland Congress, Surfer's Paradise, pp. 719–722.Google Scholar
National Institute Of Agricultural Botany (1977). Recommended varieties of grasses 1977/78. Farmers Leaflet, no. 16. Cambridge: National Institute of Agricultural Botany.Google Scholar
Osbourn, D. F. (1980). The feeding value of grass and grass products. In Grass, Its Production and Utilization (ed. Holmes, W.), pp. 70–124. Oxford: British Grassland Society: Blackwell Scientific Publications.Google Scholar
Swift, G. (1977). A comparison of Italian ryegrass (Lolium multiflorum), hybrid ryegrass (Lolium perenne X L. multiflorum) and timothy (Phleum pratense) under different systems of management. Journal of the British Grassland Society 32, 205–211.CrossRefGoogle Scholar
Thomas, T. A. (1977). An automated procedure for the determination of soluble carbohydrates in herbage. Journal of the Science of Food and Agriculture 28, 639–642.CrossRefGoogle Scholar
Tilley, J. M. A. & Terry, R. A. (1963). A two-stage technique for the in vitro digestion of forage crops. Journal of the British Grassland Society 18, 104–111.CrossRefGoogle Scholar
Van Soest, P. J. (1965). Symposium on factors influencing the voluntary intake of herbage by ruminants: voluntary intake in relation to chemical composition and digestibility. Journal of Animal Science 24, 834–843.CrossRefGoogle Scholar
Walters, R. J. K. & Evans, E. M. (1978). Intake of Sabrina under grazing. Report of the Welsh Plant Breeding Station for 1977, pp. 55–57.Google Scholar
Welsh Plant Breeding Station (1972). Report of the Welsh Plant Breeding Station for 1971, p. 16.Google Scholar
Williams, I. G. & Rushton, W. H. (1971). Variety evaluation; new hybrids. Report of the Welsh Plant Breeding Station for 1970, pp. 22–23.Google Scholar