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The impact of differences in nitrogen content, nitrogen utilization and loss from laminae on competition between four grass species in an old pasture

Published online by Cambridge University Press:  27 March 2009

J. R. B. Tallowin  and
S. K. E. Brookman
J. R. B. Tallowin
Affiliation:
Institute of Grassland and Environmental Research, North Wyke Research Station, Okehampton, Devon, EX20 2SB, UK
S. K. E. Brookman
Affiliation:
Institute of Grassland and Environmental Research, North Wyke Research Station, Okehampton, Devon, EX20 2SB, UK
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Summary

The concentration of nitrogen (N) within the emerging, youngest fully expanded and the youngest dead leaf laminae were examined in the grasses Lolium perenne, Agrostis stolonifera, Holcus lanatus and Poa trivialis in Devon, UK, in 1986 and 1987. Lamina growth, appearance interval and lamina utilization were also examined in each species. Marked tillers were measured in situ over 14–21 day periods in a continuously grazed permanent pasture under steady state management on plots receiving either zero (ON) or 400 kg nitrogen (400N) fertilizer/ha per annum. The concentration of N tended to be greatest in the distal half and least in the basal part of each lamina in each species. Total mass showed an opposite trend due in part to the shape of the lamina. Less than 40 % of the lamina N was lost through grazing either in the ON or 400N plots in the four species, except once in H. lanatus when more was lost. In absolute terms, because L. perenne and H. lanatus maintained larger and longer laminae than either A. stolonifera or P. trivialis, they lost more N through grazing. The four grass species recycled N from the senescing lamina with the same apparent efficiency; this meant that differences in lamina N concentration and carbon: nitrogen ratios were present in the dead laminae of the four species. L. perenne achieved the highest tissue growth rate per unit of N in the lamina in the ON plot, not only in comparison with the three other grasses but also compared with the 400N plot. This high N-use efficiency in L. perenne was not translated into an ability to either expand or maintain its population in the ON plot. L. perenne had a lower leaf appearance rate than the other species in both the 400N and ON plots, but this inherent characteristic of the species was particularly pronounced in the ON plot. A slower leaf appearance rate would limit the potential tillering capacity of L. perenne compared with the other species. A reduced tillering capacity, exacerbated by N deficiency, was probably the principal factor limiting the ability of L. perenne to exploit available niches in the ON pasture.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 126 , Issue 1 , February 1996 , pp. 25 - 35
Copyright
Copyright © Cambridge University Press 1996

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References

REFERENCES

Charles, A. H., Jones, J. L., Thornton, M. S. & Thomas, T. A. (1979). Comparison of ryegrass with some common unsown grasses sown separately and in mixtures. In Changes in Sward Composition and Productivity (Eds Charles, A. H. & Haggar, R. J.), pp. 25–29. Occasional Symposium of the British Grassland Society, No. 10. Hurley: British Grassland Society.Google Scholar
Genstat 5 Committee (1987). Genstat 5 Reference Manual. Oxford: Clarendon Press.Google Scholar
Hill, J. (1980). The remobilization of nutrients from leaves. Journal of Plant Nutrition 2, 407–444.CrossRefGoogle Scholar
Hirose, T., Werger, M. J. A. & Van Rheenen, J. W. A. (1989). Canopy development and leaf nitrogen distribution in a stand of Carex acutiformis. Ecology 70, 1610–1618.CrossRefGoogle Scholar
Mountford, J. O., Lakhani, K. H. & Kirkham, F. W. (1993). Experimental assessment of the effects of nitrogen addition under hay-cutting and aftermath grazing on the vegetation of meadows on a Somerset peat moor. Journal of Applied Ecology 30, 321–332.CrossRefGoogle Scholar
Parsons, A. J., Orr, R. J., Penning, P. D. & Lockyer, D. R. for Ryden, J. C. (1991). Uptake, cycling and fate of nitrogen in grass–clover swards continuously grazed by sheep. Journal of Agricultural Science, Cambridge 116, 47–61.CrossRefGoogle Scholar
Rabotnov, T. A. (1977). The influence of fertilisers on the plant communities of mesophytic grassland. Applications of Vegetation Science to Grassland Husbandry (Ed. Kraus, W.), pp. 461–497. The Hague: Dr W. Junk.Google Scholar
Tallowin, J. R. B., Tcacenco, F., Patefield, M. & Brookman, S. K. E. (1989). A correction for the influence of changes in lamina weight per unit length in grasses on measurements on the weight of lamina removed by grazing. Grass and Forage Science 44, 205–211.CrossRefGoogle Scholar
Tallowin, J. R. B., Kirkham, F. W., Brookman, S. K. E. & Patefield, M. (1990). Response of an old pasture to applied nitrogen under steady-state continuous grazing. Journal of Agricultural Science, Cambridge 115, 179–194.CrossRefGoogle Scholar
Tallowin, J. R. B., Brookman, S. K. E. & Santos, G. L. (1995). Leaf growth and utilization in four grass species under steady state continuous grazing. Journal of Agricultural Science, Cambridge 124, 403–417.CrossRefGoogle Scholar
Williams, E. D. (1985). Long-term effects of fertilizers on the botanical composition and soil seed population of a permanent grass sward. Grass and Forage Science 40, 479–483.CrossRefGoogle Scholar
Wilson, J. R. (1975). Comparative response to nitrogen deficiency of a tropical and temperate grass in the interrelation between photosynthesis, growth, and the accumulation of non-structural carbohydrate. Netherlands Journal of Agricultural Science 23, 104–112.CrossRefGoogle Scholar
Wilson, J. R. & Brown, R. H. (1983). Nitrogen response of Panicum species differing in CO2 fixation pathways. 1. Growth analysis and carbohydrate accumulation. Crop Science 23, 1148–1153.CrossRefGoogle Scholar