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Ryegrass populations from intensively managed leys: II. Reaction to nitrogen and Poa trivialis L.

Published online by Cambridge University Press:  27 March 2009

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Summary

A Lolium perenne L. population derived from a very productive 6-year-old S.23 ley was compared with that obtained from breeders' seed of S.23. The ryegrasses wqre grown in boxes sown separately, together, and also with Poa trivialis L. Three rates of nitrogen were applied equivalent to 28, 336 and 672 kg N/ha.

The results obtained when the two ryegrasses were sown separately differed from those obtained in mixtures. When sown alone, the difference between the two ryegrass populations was small, but the ‘survivor’ ryegrass had a slightly higher yield of dry matter and nitrogen at some sampling dates and fertilizer nitrogen rates. In the mixture of the two ryegrasses, S.23 was higher yielding than the ‘survivor’ population when the equivalent of 672 kg N/ha was applied, but not at lower nitrogen rates.

When grown as pure swards, P. trivialis did not yield as much dry matter and nitrogen as L. perenne at the highest N application. In the intergeneric mixtures, the total yield of ryegrass × P. trivialis was not very different from that of ryegrass sown alone. P. trivialis depressed the yield of ryegrass in May and June, particularly when fertilizer N was applied; the reverse effect was recorded later in the year. Total drymatter yield of ryegrass and P. trivialis grown together was similar at the highest fertilizer N rate, but the yield of N was much higher in ryegrass than in P. trivialis.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 2 , April 1971 , pp. 233 - 241
Copyright
Copyright © Cambridge University Press 1971

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References

Alcock, M. B.Morgan, E. W. (1966). The effect of frequency of defoliation on the yield of mixtures of S22 (Diploid) and Tetra (Tetraploid) Italian ryegrass in early establishment. J. Br. Qrassld Soc. 21, 62–4.CrossRefGoogle Scholar
Allen, G. P. (1966). The botany, ecology, agronomy and control of Poatrivialis L. Rough-stalked meadowgrass. Tech. Rep. Agris. Ees. Council Weed Res. org., No. 6.Google Scholar
na>Andries, A. (1965). The effect of different methods of improving the botanical composition of permanent pasture. Neth. J. agric. Sci. 13, 114–19.Google Scholar
Baker, H. K. (1962). A survey of English grasslands. 6th Br. Weed Control Conf. pp. 23–6.Google Scholar
Charles, A. H.Crampton, C. B. (1963). Selection pressure operating on grass populations. In Soil Moisture. Rep. Welsh Soils Disc. Group, No. 4., 89–96.Google Scholar
Charles, A. H. (1964). Differential survival of plant types in swards. J. Br. Qrassld Soc. 19, 198–204.CrossRefGoogle Scholar
Charles, A. H. (1966). Variation in grass and clover populations in response to agronomic selection pressures. Proc. X int. Grassld Congr., Helsinki 625–9.Google Scholar
Charles, A. H. (1970). Ryegrass populations from intensively managed leys. I. Seedling and spaced plant characters. J. agric. Sci., Camb. 75, 103–107.CrossRefGoogle Scholar
Copeman, G. J. F.Swift, G. (1966). The value of spaced plants in assessing the yield potential of herbage varieties at varying nitrogen levels. Proc. X int. Qrassld Congr., Helsinki 173–7.Google Scholar
Crossley, G. K.Bradshaw, A. D. (1968). Differences in response to mineral nutrients of populations of ryegrass, Lolium perenne L. and orohardgrass, Dactylis glomerata L. Crop Sci. 8, 383–7.Google Scholar
Donald, C. M. (1963). Competition among crop and pasture plants. Adv. Agron. 15, 1–118.CrossRefGoogle Scholar
Green, J. O. (1965). Exps Prog. Grassld Res. Inst. 17, 14–15.Google Scholar
Harper, J. L. (1967). A Darwinian approach to plant ecology. J. Ecol. 55, 247–70.CrossRefGoogle Scholar
Hayward, M. D. (1970). Selection and survival in Lolium perenne L. Heredity, Lond. 25– 441–7.CrossRefGoogle Scholar
Lazenby, A. (1957). The problem of assessing strains. A study in grass-breeding technique. J. agric. Sci., Camb. 48, 294–304.CrossRefGoogle Scholar
Lazenby, A. & Rogers, H. H. (1965). Selection criteria in grass breeding. V. Performance of Lolium perenne genotypes grown at different nitrogen levels and spacings. J.agric. Sci., Camb. 65, 79–89.CrossRefGoogle Scholar
Rhodes, I. (1968). Yield of contrasting ryegrass varieties in monoculture and mixed culture. J. Br. Orassld Soc. 23, 156–8.CrossRefGoogle Scholar
Rhodes, I. (1969). The yield, canopy structure and light interception of two ryegrass varieties in mixed culture and monoculture. J. Br. Orassld Soc. 24, 123–7.CrossRefGoogle Scholar
Snaydon, R. W.Bradshaw, A. D. (1969). Differences between natural populations of Trifolium repena L. in response to mineral nutrients.II. Calcium, magnesium and potassium J. appl. Ecol. 6, 185–202.CrossRefGoogle Scholar
Suckling, F. E. T. (1960). Productivity of pasture species on hill country. N.Z. Jl agric. Res. 3, 579–91.CrossRefGoogle Scholar
Vartha, E. W. (1966). Of what significance is the presence of Poa trivialis in ryegrass pastures? Proc. N.Z. Orassld Ass., 1965, 102–11.Google Scholar
Vose, P. B.Breese, E. L. (1964). Genetic variation in the utilization of nitrogen by ryegrass species Lolium perenne and L. multiflorum. Ann. Bot. N.S. 28, 251–70.CrossRefGoogle Scholar
Vries, D. M. de (1938). The recovery of grassland from drought produced damage in relation to the desirability or not of heavy applications of, nitrogen. Herb. Abstr. 8, p. 83.Google Scholar
Whittington, W. J.O'Brien, T. A. (1968). A comparison of yields from plots sown with a single species or a mixture of grass species. J. appl. Ecol. 5, 209–13.CrossRefGoogle Scholar