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Nitrogen response and stocking rate of Pennisetum clandestinum pastures: I. Pasture nitrogen requirement and concentration, distribution of dry matter and botanical composition

Published online by Cambridge University Press:  27 March 2009

P. T. Mears  and
L. R. Humphreys
P. T. Mears
Affiliation:
New South Wales Department of Agriculture, Research Station, Grafton, 2460
L. R. Humphreys
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, 4067, Australia
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Summary

Ammonium nitrate was applied to a kikuyu (Pennisetum clandestinum) dominant pasture at annual rates of 0, 134, 336 and 672 kg N/ha. Each nitrogen (N) rate treatment was continuously grazed at three stocking rates (SR) designed to apply similar grazing pressures at each N level and covering a range from 2·2 to 16·6 Angus weaner cattle/ha.

The N status of these pastures was periodically assessed 8–10 weeks after seasonal N applications by temporarily excluding stock and measuring D.M. and N response to additional ammonium nitrate application. Pasture growth response to additional N was constant and independent of SR and of annual N rate over the range 0 to 336 kg N/ha, despite wide variation in pasture availability. N concentration of plant shoots was increased by high SR and rate of N uptake was not significantly affected by SR. Pasture growth rate was positively related to annual N rate.

Herbage yield of kikuyu leaf, stem and litter on offer, was negatively related to SR but weight of underground organs was unaffected. Increasing SR increased the proportion of leaf and the rate of tillering. Pasture availability was positively and linearly related to N rate from 0 to 336 kg N/ha and maximal at 336 kg N/ha; the size of the litter fractions and underground organs was generally independent of N rate. N% in leaf and stem was reduced at low SR; N% of leaf, stem, litter, rhizome and root was positively related to N rate which was more influential than SR. The effect of SR on the size and relative distribution of the N in plant tops and litter fraction is discussed.

Kikuyu dominance was positively related to N rate and independent of SR. White clover invaded at No and N131 levels especially at a high SR.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 83 , Issue 3 , December 1974 , pp. 451 - 467
Copyright
Copyright © Cambridge University Press 1974

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References

Alder, F. E., Cowlishaw, S. J., Newton, J. E. & Chambers, D. T. (1967). The effect of level of nitrogen fertilizer on beef production from grazed perennial rye grass/white clover pastures. Part I. An irrigation experiment. Journal of the British Grassland Society 22, 194–203.CrossRefGoogle Scholar
A.R.C. (1965). The Nutrient Requirements of Farm Livestock, No. 2. Ruminants, Summaries of Estimated Requirements. London: Agricultural Research Council.Google Scholar
Anderson, A. J. & Arnot, R. H. (1953). Fertilizer studies on a basaltic red loam soil from the Lismore district, N.S.W. Australian Journal Agricultural Research 4, 29–43.CrossRefGoogle Scholar
Arnold, G. W. (1964). Some principals in the investigation of selective grazing. Proceedings of the Australian Society of Animal Production v, 258–71.Google Scholar
Biddulph, O., Biddulph, S., Cory, R. & Koentz, H. (1958). Circulation pattern for phosphorus, sulphur and calcium in the bean plant. Plant Physiology, Lancaster 33, 293–300.CrossRefGoogle ScholarPubMed
Brockman, J. S., Rope, C. M. & Stevens, M. T. (1971). The effect of the grazing animal on the N status of grass swards. Journal of the British Grassland Society 26, 209–12.CrossRefGoogle Scholar
Colman, R. L. (1966). Kikuyu yields with nitrogen fertilizer. Agricultural Gazette of New South Wales 77, 375.Google Scholar
Colman, R. L. & Holder, J. M. (1968). Effect of stocking rate on butterfat production of dairy cows grazing kikuyu grass pasture fertilized with nitrogen. Proceedings of the Australian Society of Animal Production 7, 129–32.Google Scholar
Colman, R. L. & Lazenby, A. (1970). Factors affecting the response of some tropical and temperate grasses to fertilizer nitrogen. Proceedings of the 11th International Grasslands Congress, pp. 392–7.Google Scholar
Crofts, F. C., Pulsford, J. S. & Jenkins, H. V. (1955). Legume nutrition on red basaltic soils of the Richmond river district of New South Wales. Journal of the Australian Institute of Agricultural Science 21, 94–8.Google Scholar
Davidson, R. L. (1964). Theoretical aspects of nitrogen economy in grazing experiments. Journal of the British Grassland Society 19, 273–80.CrossRefGoogle Scholar
Doak, B. W. (1952). Some chemical changes in the nitrogenous constituents of urine when voided on pasture. The Journal of Agricultural Science, Cambridge 42, 162–71.CrossRefGoogle Scholar
Gartner, J. A. (1967). A visual appraisal method for the estimation of botanical composition in a dense sward. Queensland Journal of Agriculture and Animal Science 24, 135–40.Google Scholar
Gartner, J. A. (1969). Effect of fertilizer nitrogen on a dense sward of kikuyu, paspalum and carpet grass. I. Botanical composition, growth and nitrogen uptake. Queensland Journal of Agriculture and Animal Science 26, 21–33.Google Scholar
Greenwood, E. A. N. & Arnold, G. W. (1968). The quantity and frequency of removal of herbage from an emerging annual grass sward by sheep in a set-stocked system of grazing. Journal of the British Grassland Society 23, 144–8.CrossRefGoogle Scholar
Greenwood, E. A. N. & Titmanis, Z. V. (1968). The effect of defoliation on nitrogen stress and its relation to leaf nitrogen in young Lolium rigidum Gaud. Australian Journal of Agricultural Research 19, 9–14.CrossRefGoogle Scholar
Henzell, E. F. & Oxenham, D. J. (1964). Seasonal changes in the nitrogen content of three warmclimate pasture grasses. Australian Journal of Experimental Agriculture and Animal Husbandry 4, 336–44.CrossRefGoogle Scholar
Henzell, E. F., Vallis, I. & Lindquist, J. E. (1968). Automatic colorimetrio methods for the determination of nitrogen in digests and extracts of soil. Ninth International Congress of Soil Science Transactions III, 513–20.Google Scholar
Hudson, W. J. C., Swain, F. G., Holder, J. M., Colman, R. L. & Bird, J. G. (1966). Development and evaluation of pastures for dairy cattle in a subtropical environment. Proceedings of the Ninth International Grassland Congress, pp. 923–7.Google Scholar
Hunt, L. A. (1965). Some implications of death and decay in pasture production. Journal of the British Grassland Society 20, 27–31.CrossRefGoogle Scholar
Hutchinson, K. J. (1971). Productivity and energy flow in grazing fodder conservation systems. Herbage Abstracts 41, 1–10.Google Scholar
Jones, R. J. (1969). Beef production from intensively managed pastures. C.S.I.R.O. Division of Tropical Pastures Annual Report, 1968–9, p. 47.Google Scholar
Kretschmer, A. E. (1964). Effects of late nitrogen fertilization on the distribution of nitrogen in pangola grass and coastal Bermudagrass on Immokalee fine sand. Soil and Crop Science Society of Florida Proceedings 24, 167–76.Google Scholar
MacDiarmid, B. N. & Watktn, B. R. (1972). The cattle dung patch 3. Distribution and rate of decay of dung patches and their influences on grazing behaviour. Journal of the British Grassland Society 27, 48–54.Google Scholar
McLachlan, K. D. & Norman, B. W. (1966). Observations on the superphosphate requirements of two grazing experiments. Australian Journal of Experimental Agriculture and Animal Husbandry 6, 22–4.CrossRefGoogle Scholar
Mears, P. T. (1970). Kikuyu – (Pennisetum clandestinum) as a pasture grass – A review. Tropical Grasslands 4, 139–52.Google Scholar
Mears, P. T. (1973). Effect of stocking rate on the nitrogen response characteristics of kikuyu (Pennisetum clandestinum) pasture. Ph.D. Thesis University of Queensland.Google Scholar
Mears, P. T. & Babkus, B. (1970). Response of glycine wightii to molybdenised superphosphate on a krasnozem. Australian Journal of Experimental Agriculture and Animal Husbandry 10, 415–25.CrossRefGoogle Scholar
Mears, P. T. & Humphreys, L. R. (1974). Nitrogen response and stocking rate of (Pennisetum clandestinum) pastures. II. Cattle growth. The Journal of Agricultural Science, Cambridge 83, 469–478.CrossRefGoogle Scholar
Nicolls, K. D., Colwell, J. D. & Tucker, B. M. (1953). A survey of soils and some aspects of oil fertility in the Lismore district, New South Wales. C.S.I.R.O. Division of Soils and Landuse Series No. 11.Google Scholar
Ozanne, P. G. & Howes, K. M. W. (1971). The effects of grazing on the phosphorus requirement of an annual pasture. Australian Journal of Agricultural Research 22, 81–92.CrossRefGoogle Scholar
Pate, J. S. (1968). Physiological aspects of inorganic and intermediate nitrogen metabolism (with special reference to the legume, Pisum arvense L.). In Recent Aspects of Nitrogen Metabolism in Plants, pp. 219–40. Academic Press.Google Scholar
Petersen, R. G., Lucas, H. L. & Woodhouse, W. W. (1956). The distribution of excreta by freely grazing cattle and its effect on pasture fertility. 1. Excretal distribution. Agronomy Journal 48, 440–3.CrossRefGoogle Scholar
Russell, E. J. (1958). Soil Conditions and Plant Growth, pp. 134–311. London: Longmans, Green and Co.Google Scholar
Swain, F. G. (1959). Responses to molybdenum three years after previous application on red basaltic soils on the Far North Coast of N.S.W. Journal of the Australian Institute of Agricultural Science 25, 51–4.Google Scholar
Troughton, A. (1957). The underground organs of grasses. Commonwealth Agricultural Bureau Bulletin p. 44.Google Scholar
Watson, E. R. & Lapins, P. (1964). The influence of subterranean clover pastures on soil fertility. II. The effect of certain management systems. Australian Journal of Agricultural Research 15, 885–94.CrossRefGoogle Scholar
Watson, E. R. & Lapins, P. (1969). Losses of nitrogen from urine on soils from south-western Australia. Australian Journal of Experimental Agriculture and Animal Husbandry 9, 85–91.CrossRefGoogle Scholar
Wilson, J. R. & Haydock, K. P. (1971). The comparative response of tropical and temperate grasses to varying levels of nitrogen and phosphorus nutrition. Australian Journal of Agricultural Research 22, 573–87.CrossRefGoogle Scholar
Whitehead, D. C. (1970). Carbon, nitrogen, phosphorus and sulphur in herbage plant roots. Journal of the British Grassland Society 29, 236–41.CrossRefGoogle Scholar