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Persistence and growth of Lotononis bainesii–Digitaria decumbens pastures: 2. Sheep treading

Published online by Cambridge University Press:  27 March 2009

A. Pott ,
L. R. Humphreys  and
J. W. Hales
A. Pott
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, 4067, Australia
L. R. Humphreys
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, 4067, Australia
J. W. Hales
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, 4067, Australia
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Summary

A pasture of Lotononis bainesii and Digitaria decumbens cv. Pangola at Mt Cotton, south-east Queensland was mown on six occasions at intervals of ca. 3 months and after each mowing was subjected in 1 day to the treading intensity expected from sheep grazing at 0, 7, 14, 21 and 28/ha. A movable corridor and folds were employed to walk the sheep the required number of times on eight replicates of each treatment.

Lotononis regrowth was negatively related to sheep treading intensity, whereas Pangola was highly resistant to treading and grew vigorously from underground buds on rhizomes and from persisting stolons. Young lotononis seedlings were more vulnerable than older seedlings which had branched; plants developed from autonomous nodal roots were more resistant than seedlings. Attention is drawn to the contractile growth of the hypocotyl following epigeal germination which leads to a buried crown.

Lotononis plants were short-lived, and seedling regeneration of ca. 27 and 47 plants/m2 occurred in the late summer of the 2nd and 3rd year after sowing. Soil seed reserves averaged 16900/m2. Studies might be undertaken of management systems directed to favouring lotononis plant replacement through accretion to seed reserves, seedling regeneration through the creation of ‘gaps’, and seedling survival through judicious timing of grazing.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 101 , Issue 1 , August 1983 , pp. 9 - 15
Copyright
Copyright © Cambridge University Press 1983

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References

Crowder, L. V. & Chow, K. H. (1974). Seedling vigor and establishment of tropical and sub-tropical legumes. Nigerian Agricultural Journal 2, 157–164.Google Scholar
Edmond, D. B. (1958). The influence of treading on pasture – a preliminary study. New Zealand Journal of Agricultural Research 1, 319–328.Google Scholar
Evans, P. S. (1967). Leaf strength studies of pasture grasses. 1. Apparatus, techniques and some factors affecting leaf strength. Journal of Agricultural Science, Cambridge 69, 171–174.CrossRefGoogle Scholar
Gillard, P. (1969). The effect of stocking rate on botanical composition and soils in natural grassland in South Africa. Journal of Applied Ecology 6, 489–497.CrossRefGoogle Scholar
Gradwell, M. W. (1965). Soil physical conditions of winter and the growth of ryegrass plants. 1. Effects of compaction and puddling. New Zealand Journal of Agricultural Research 8, 238–261.CrossRefGoogle Scholar
Humphreys, L. R. (1978). Tropical Pasturesand Fodder Crops. London: Longman.Google Scholar
Hunt, W. F. (1979). Effects of treading and defoliation height on the growth of Paspalum dilatatum Poir. New Zealand Journal of Agricultural Research 22, 69–75.CrossRefGoogle Scholar
Kimball, M. E. & Greub, L. J. (1977). Contractile growth of the hypocotyl in legume seedlings. Agronomy Abstracts, 100–101.Google Scholar
Pott, A. (1979). Effects of sheep grazing and treading, and of shading on the growth and population dynamics of Lotononis bainesii grown with Digitaria decumbens. Ph.D. thesis, University of Queensland.Google Scholar
Pott, A. & Humphreys, L. R. (1983). Persistence and growth of Lotononis bainesii–Digitaria decumbens pastures. 1. Sheep stocking rate. Journal of Agricultural Science, Cambridge 101, 1–7.CrossRefGoogle Scholar