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Influence of age and year of growth on the botanical composition and productivity of swards

Published online by Cambridge University Press:  27 March 2009

A. Smith  and
P. J. Allcock
A. Smith
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks, SL6 5LR
P. J. Allcock
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks, SL6 5LR
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Summary

An account is given of vegetational and yield changes occurring in sown swards of Lolium perenne L. to which four alternative management treatments were applied for 8 years.

With infrequent cutting (four cuts per year), and a fertilizer nitrogen rate of 188 kg/ha per year, there was a substantial invasion by Agrostis spp. At 376 kg N/ha under cutting the main invader was Agropyron repens (L.) Beauv. with a lower proportion of Agrostis. After cutting at 752 kg N/ha, the swards became dominated by A. repens. With rotational sheep grazing, at 376 kg N/ha, the main invader was Poa annua L., although the proportion was low and L. perenne remained the dominant species. The plant successions which occurred with each type of management as the swards became older had little influence on the yield or quality of herbage under grazing or cutting.

Because sward age is confounded with the influence of year-to-year environmental variation, the experiment was designed to enable independent assessments of these factors to be made. Sequential sowings were made to produce an array of swards between 1 and 7 years old. Year-to-year fluctuations in the pattern of herbage production were quantified after allowing for the progressive increase in sward age. Similarly, the influence of age was investigated by adjusting yields for year effects, and comparing swards of different ages in the same year.

Year-to-year variation in the total yield of dry matter was much greater than variation attributable to sward age. There was similarly more variation due to year than to age in the yield of D.M. at any one season. In the most extreme comparison, the D.M. yield at an individual defoliation in one year was 2·8 times the lowest yield at the same season in a different year, whereas the yield at the same season varied by a factor of up to 1·5 between swards of different ages.

The influence of age on quality was quantified for cut swards only. There was an age effect only at the first cut, when the percentage of digestible organic matter (DOM) declined with age, and herbage nitrogen concentration increased, at the lowest level of fertilizer N, but these changes did not occur at higher N levels. Annual yields of DOM declined significantly with age, but only at the highest N level, and there were no significant changes in the annual yield of herbage N.

Comparisons were made of the cumulative D.M. yields for several years of young swards, resown every 3 years, and undisturbed swards, up to 7 years old. Young swards gave a higher yield during the first two years after sowing, but the advantage was lost in the period of ploughing and establishment, during which time the undisturbed swards achieved a small advantage in cumulative yield. Cumulative yields of DOM and N from young swards were not sufficiently different from those of older swards to suggest that there would be an advantage from regular resowing. A theoretical analysis was made to predict the long-term yields of D.M. and DOM from different renovation strategies at yearly steps from 2 to 7 years. This suggested that ploughing and resowing gave little or no advantage in productivity over swards which were not renovated before age 7, and resowing too frequently gave a loss of yield.

The paper contains an appendix by A. Smith and R. E. Deriaz describing a method used for the correction of analytical results obtained for variable contamination of herbage samples by extraneous materials.

Information

Type
Research Article
Information
The Journal of Agricultural Science , Volume 105 , Issue 2 , October 1985 , pp. 299 - 325
Copyright
Copyright © Cambridge University Press 1985

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References

REFERENCES

Anslow, R. C. (1967). Frequency of cutting and sward production. Journal of Agricultural Science, Cambridge 68, 377–384.CrossRefGoogle Scholar
Anslow, R. C. & Green, J. O. (1967). The seasonal growth of pasture grasses. Journal of Agricultural Science, Cambridge 68, 109–122.CrossRefGoogle Scholar
Back, H. L., Alder, F. E. & Gibbs, B. G. (1969). An evaluation of an electronic instrument for pasture yield estimation. 2. Use with double sampling for regression estimation. Journal of the British Grassland Society 24, 168–172.CrossRefGoogle Scholar
Black, C. A. (1968). Soil-Plant Relationships. New York: Wiley.Google Scholar
Blattmann, W. (1974). Fodder quality and botanical composition of permanent pastures in relationship to the length of the resting periods. Proceedings of the 5th General Meeting of the European Grassland Federation, Uppsala, 1973. Vaxtodling 29, 18–22.Google Scholar
Brockman, J. S. (1969). The relationship between total N input and yield of cut grass swards. Journal of the British Grassland Society 24, 89–97.CrossRefGoogle Scholar
Chestnutt, D. M. B., Murdoch, J. C., Harrington, F. J. & Binnie, R. C. (1977). The effect of cutting frequency and applied nitrogen on production and digestibility of perennial ryegrass. Journal of the British Grassland Society 32, 177–183.CrossRefGoogle Scholar
Clement, C. R. & Hopper, M. J. (1968). The supply of potassium to high-yielding cut grass. Quarterly Review 79, National Agricultural Advisory Service, 101–109.Google Scholar
Clouting, G. M. & Hawkins, R. P. (1966). A technique for measuring the persistency of grass varieties. Journal of the National Institute of Agricultural Botany 10, 621–627.Google Scholar
Corrall, A. J. (1974). The effect of interruption of flower development on the yield and quality of perennial ryegrass. Proceedings of the 5th General Meeting of the European Grassland Federation, Uppsala, 1973. Vaxtodling 29, 39–43.Google Scholar
Corrall, A. J. (1979). Evaluation of forage crops. Information Leaflet 11. Hurley: Grassland Kesearch Institute.Google Scholar
Corrall, A. J., Lavender, R. H. & Terry, C. P. (1979). Grass species and varieties. Seasonal patterns of production and relationships between yield, quality and date of first harvest. Technical Report 26, 23 pp. Hurley: Grassland Research Institute.Google Scholar
Cowling, D. W. & Lockyer, D. R. (1965). A comparison of the reaction of different grass species to fertilizer nitrogen and to growth in association with white clover. 1. Yield of dry matter. Journal of the British Grassland Society 20, 197–204.CrossRefGoogle Scholar
Cowling, D. W. & Lockyer, D. R. (1967). A comparison of the reaction of different grass species to fertilizer nitrogen and to growth in association with white clover. 2. Yield of nitrogen. Journal of the British Grassland Society 22, 53–61.CrossRefGoogle Scholar
Cussans, G. W. (1972). A study of the growth of Agropyron repens (L.) Beauv. during and after the growth of spring barley as influenced by the presence of undersown crops. Proceedings of the llth British Weed Control Conference, 1972, 689–697.Google Scholar
Davies, D. A. & Munro, J. M. M. (1974). Potential pasture production in the uplands of Wales. 4. Nitrogen response from sown and natural pastures. Journal of the British Grassland Society 29, 149–158.CrossRefGoogle Scholar
Doyle, C. J. & Wilkins, R. J. (1984). Grassland production: realising the potential. Money from Grass (ed. Corrall, A. J.). Occasional Symposium 15. Hurley: British Grassland Society.Google Scholar
Forbes, T. J., Dibb, C., Green, J. O., Hopkins, A. & Peel, S. (1980). Factors affecting the productivity of permanent grassland. A national farm study, 141 pp. Hurley: The Grassland Research Institute and Agricultural Development and Advisory Service Joint Permanent Pasture Group.Google Scholar
Garwood, E. A., Tyson, K. C. & Clement, C. R. (1977). A comparison of yield and soil conditions during 20 years of grazed grass and arable cropping. Technical Report 21. Hurley: Grassland Research Institute.Google Scholar
Garwood, E. A., Tyson, K. C. & Sinclair, J. (1979). Use of water by six grass species. 1. Dry matter yields and response to irrigation. Journal of Agricultural Science, Cambridge 93, 13–24.CrossRefGoogle Scholar
Green, J. O. (1982). A sample survey of grassland in England and Wales, 1970–1972, 39 pp. Hurley: Grassland Research Institute.Google Scholar
Green, J. O., Corrall, A. J. & Terry, R. A. (1971). Grass species and varieties. Relationships between stage of growth, yield and forage quality. Technical Report 8, 81 pp. Hurley: Grassland Research Institute.Google Scholar
Haggar, R. J. (1976). The seasonal productivity, quality and response to nitrogen of four indigenous grasses compared with Lolium perenne. Journal of the British Grassland Society 31 (4), 197–207.CrossRefGoogle Scholar
Hakansson, S. & Wallgren, B. (1976). Agropyron repens (L.) Beauv., Holcus mollis L. and Agrostis gigantea Roth, as weeds – some properties. Swedish Journal of Agricultural Research 6 (2), 109–120.Google Scholar
Helps, M. B. & Mair, R. B. (1970). Two year leys – the effect of rate and pattern of nitrogen application on the yield of five swards. Experimental Husbandry 19, 78–85.Google Scholar
Hunt, I. V. (1962). The persistence and productivity of grasses on upland peat. Experimental Record 4, 34 pp. West of Scotland Agricultural College.Google Scholar
Hunt, I. V. (1966). The effect of age of sward on the yield and response of grass species to fertilizer nitro – gen. Proceedings of the Tenth International Grassland Congress, Helsinki, pp. 249–254.Google Scholar
Jackson, M. V. & Williams, T. E. (1979). Response of grass swards to fertilizer nitrogen under cutting and grazing. Journal of Agricultural Science, Cambridge 92, 549–562.CrossRefGoogle Scholar
Lee, G. R., Davies, L. H., Armitage, E. R. & Hood, A. E. M. (1977). The effect of rates of nitrogen application on seven perennial ryegrass varieties. Journal of the British Grassland Society 32, 83–87.CrossRefGoogle Scholar
McBratney, J. M. (1978). Production of perennial ryegrass cultivars of different maturity types when grown as pure swards and in certain combinations. Journal of the British Grassland Society 33, 283–287.CrossRefGoogle Scholar
Ministry of Agriculture, Fisheries and Food (1978). Couch. Advisory Leaflet 89.Google Scholar
Minson, D. J., Raymond, W. F. & Harris, C. E. (1960). Studies in the digestibility of herbage. 8. The digestibility of S. 37 cocksfoot, S. 23 ryegrass and S. 24 ryegrass. Journal of the British Grassland Society 15, 174–180.CrossRefGoogle Scholar
Morrison, J., Jackson, M. V. & Sparrow, P. E. (1980). The response of perennial ryegrass to fertilizer nitrogen in relation to climate and soil. Report of the joint ADAS/GRI Grassland Manuring Trial – GM 20. Technical Report 27. Hurley: Grassland Research Institute.Google Scholar
Mudd, C. H. (1965). A comparison between Italian ryegrass, perennial ryegrass and timothy under upland conditions. Experimental Husbandry 12, 51–61.Google Scholar
Prins, W. H. (1983). Limits to nitrogen fertilizer on grassland. Published thesis, Landbouwhogeschool, Wageningen.Google Scholar
Reid, D. (1970). The effects of a wide range of nitrogen application rates on the yields from a perennial ryegrass sward with and without clover. Journal of Agricultural Science, Cambridge 74, 227–240.CrossRefGoogle Scholar
Reid, D. (1972). The effects of the long-term application of a wide range of nitrogen rates on the yields from perennial ryegrass swards with and without white clover. Journal of Agricultural Science, Cambridge 79, 291–301.CrossRefGoogle Scholar
Reid, D. & Castle, M. E. (1970). A comparison of anhydrous ammonia and a solid ammonium nitrate fertilizer on herbage production from a pure perennial ryegrass sward. Journal of Agricultural Science, Cambridge 75, 347–353.CrossRefGoogle Scholar
Roberts, H. A. (ed.) (1982). Weed Control Handbook: Principles, 533 pp. Oxford: Blaekwell Scientific Publications.Google Scholar
Russell, E. J. (1973). Soil Conditions and Plant Growth. London: Longman.Google Scholar
Smith, A. (1969). Longevity of herbage crops. A longterm experiment. Annual Report, Grassland Research Institute, 1968, pp. 135–142.Google Scholar
Smith, A. (1979). Changes in botanical composition and yield in a long-term experiment. In Changes in Sward Composition and Productivity (ed. Charles, A. H. and Haggar, R. J.). Occasional Symposium 10. Hurley: British Grassland Society.Google Scholar
Smith, A. & Allcock, P. J. (1976). Herbage yield and weed ingress of sown perennial ryegrass swards. Proceedings of the 1976 British Crop Protection Conference – Weeds 2, 561–566.Google Scholar
Smith, A. & Allcock, P. J. (1979). An inexpensive method for producing grassland maps from colour slides. Journal of Applied Ecology 16 (2), 589–593.CrossRefGoogle Scholar
Smith, A. & Allcock, P. J. (1985). The influence of species diversity on sward yield and quality. Journal of Applied Ecology 22 (1) 185–198.CrossRefGoogle Scholar
Smith, A., Allcock, P. J., Cooper, E. M. & Forbes, T. J. (1982). The influence of sward composition and environment on stocking rate. Permanent Grassland Studies No. 4, GRI-ADAS Joint Permanent Pasture Group, Hurley.Google Scholar
Spedding, C. R. W. & Diekmahns, E. C. (ed.) (1972). Grasses and Legumes in British Agriculture. Bulletin 49, 511 pp. Commonwealth Bureau of Pastures and Field Crops, Commonwealth Agricultural Bureaux, Farnham Royal, Bucks.Google Scholar
Stewart, T. A., Brown, S. M. & Boyd, M. (1966). Relative production of six perennial ryegrass cultivars grown with and without clover plus artificial nitrogen and with clover only, under simulated pasture conditions. Record of Agricultural Research, Northern Ireland 15, 99–133.Google 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
Wells, G. J. (1974). The autecology of Poa annua L. in perennial ryegrass pastures. Ph.D. thesis, University of Reading.Google Scholar
Widdowson, F. V., Penny, A. & Williams, R. J. B. (1963). An experiment comparing responses to nitrogen fertilizer of four grass species. Experimental Husbandry 9, 28–36.Google Scholar
Wilman, D. & Mzamane, N. (1982). The content and yield of six elements in four grasses as affected by nitrogen application and interval between harvests. Fertilizer Research 3, 97–109.CrossRefGoogle Scholar