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RESEARCH ARTICLE
Contents Vol 46(4)

Effect of environmental factors on the growth of grazed pasture in south-western Victoria

H. A. Birrell A B and R. L. Thompson A
+ Author Affiliations
- Author Affiliations

A Department of Natural Resources and Environment Pastoral and Veterinary Institute, Private Bag 105, Hamilton, Vic. 3300, Australia.

B Corresponding author. Current address: 343 Rosevears Drive, Rosevears, Tas. 7275, Australia.

Australian Journal of Experimental Agriculture 46(4) 545-554 https://doi.org/10.1071/EA03048
Submitted: 18 February 2003  Accepted: 9 December 2004   Published: 20 April 2006

Abstract

This paper presents work from several studies on pasture production that were conducted in south-west Victoria at the Pastoral Research Institute, Hamilton. The frequency with which pasture growth commenced for each week of autumn in the years from 1965 to 1991 was assessed. The median period for the commencement of growth was in the third week of March (although the average date was March 27). Autumn data from several trials conducted over 3 decades were collated and analysed. A relationship between the grazed pasture yield (average of stocking rates plots) at the end of autumn and the rainfall showed that 200 mm of rainfall in the 3 months to the end of May was optimal while higher rainfall depressed the growth. The average daily growth rates of introduced pasture (perennial rye grass, Lolium perenne L. cv. Victorian, phalaris, Phalaris aquatica L. cv. Australian, subterranean clover Trifolium subterranneum L. and volunteer species) were measured in 2- and 4-week growth periods (G 2 and G 4, kg DM/ha.day) for the seasonal growth cycles over 4 years (1980–84 except 1983) when grazed by Merino wether sheep at stocking rates of 10, 13 or 18 sheep/ha. The rainfall throughout the study was lower than normal. Although differences in the animal performance between the stocking rates were only small, at the low stocking rate capeweed (Arctotheca calendula L.) in patches became the major component of the sward. Greater variation in G 2 than in G 4 indicated that growth responded quickly to current environmental conditions. A nonlinear regression accounted for 74% of the variance in G 2 when related to the 3 climatic factors of daylength, soil temperature at 10 cm depth and the soil moisture to a depth of 10 cm, and a plant factor of green herbage yield. The 26 % of unaccounted variance appears to be associated with an effect of stocking rate, possibly botanical composition. The botanical composition was not continuously monitored hence the only sward character included in the investigation was herbage yield. Comparison of the patterns of pasture growth from different latitudes indicated that while the growth pattern in south-western Victoria is erratic, it is intermediary between Mediterranean and temperate pasture types. Understanding this aspect has implications for improving the efficiency of animal production in this environment.

Additional keywords: grazed pasture, pasture growth, pasture production.


Acknowledgments

The authors thank colleagues who helped to collect this data and Dr L. Sparrow for assistance in preparing the figures for this manuscript.


References


Arnold GW, McManus WR, Bush G (1964) Studies in the woolproduction of grazing sheep. 1. Seasonal variation in feed intake, liveweight and wool production Australian Journal of Experimental Agriculture and Animal Husbandry 4, 392–403.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Baars JA, Waller JE (1979) Effects of temperature on pasture production. Proceedings of the Agronomy Society of New Zealand 9, 101–104. open url image1

Bird PR , Watson MJ , Cayley JD (1979) The sulphur requirements of ruminants and the S and N status of perennial pastures in southern Victoria. In ‘Sulphur in forages’. pp. 228–250. (An Foras Taluntais: Dublin)

Birrell HA (1981) Some factors which affect the liveweight change and wool growth of adult Corriedale wethers grazed at various stocking rates on perennial pasture in southern Victoria. Australian Journal of Agricultural Research 32, 353–370.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Birrell HA (1989) The influence of pasture and animal factors on the consumption of pasture by grazing sheep. Australian Journal of Agricultural Research 40, 1261–1275. open url image1

Birrell HA (1992) Factors associated with the rate of growth of clean wool on grazing sheep. Australian Journal of Agricultural Research 43, 265–275.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Birrell HA, Bishop AH (1980) Effect of feeding strategy and area of pasture conserved on the wool production of wethers. Australian Journal of Experimental Agriculture and Animal Husbandry 20, 406–412.
| Crossref |
open url image1

Birrell HA, Thompson RL (1987) Seasonal calibration of the single probe electronic pasture meter on perennial pasture in southern Victoria. The Journal of the Australian Institute of Agricultural Science 53, 199–201. open url image1

Birrell HA, Bishop AH, Tew A, Plowright RD (1978) Effect of stocking rate, fodder conservation and grazing management on the performance of wether sheep and pastures in south-west Victoria. 2. Seasonal wool growth rate, liveweight and herbage availability. Australian Journal of Experimental Agriculture and Animal Husbandry 18, 41–50.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Bishop AH, Birrell HA (1975) Effect of stocking rate, fodder conservation and grazing management on the performance of wether sheep in south-west Victoria. 1. Wool production. Australian Journal of Experimental Agriculture and Animal Husbandry 15, 173–182.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Brown WF, Moer LE, Klopfenstein TJ (1986) Development and validation of a dynamic model of growth and quality of cool season grasses. Agricultural Systems 20, 37–52.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Chapman RE, Wheeler JL (1963) Dyebanding: a technique for fleece growth studies. Australian Journal of Science 58, 187. open url image1

Deinum B, de Beyer J, Nordfeldt PH, Kornher A, Ostgard O, van Bogaert G (1981) Quality of herbage at different latitudes. Netherlands Journal of Agricultural Science 21, 141–150. open url image1

Egan JK, Thompson RL, McIntyre JS (1977) Stocking rate, joining time, fodder conservation and the productivity of Merino ewes. Australian Journal of Experimental Agriculture and Animal Husbandry 17, 566–573.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Fitzpatrick EA , Nix HA (1970) The climatic factor in Australian grassland ecology. In ‘Australian grasslands’. (Ed. RM Moore) pp. 3–26. (Australian National University Press: Canberra)

Fukai S, Silsbury JH (1978) A growth model for Trifolium subterraneum L. swards. Australian Journal of Agricultural Research 29, 51–65.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Genstat Committee (1983) ‘GENSTAT. A general statistical program.’ (Numeric Algorithms Group: Oxford)

Hounan CE , Powell FA (1964) Climate of the basaltic plains of Western Victoria. Working Paper 63/314. Commonwealth of Australia, Bureau of Metereology, Melbourne, Australia.

Johns GG, Smith RGC (1975) Accuracy of soil water budgets based on a range of relationships for the influence of soil water availability on the actual water use. Australian Journal of Agricultural Research 26, 871–883.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Langlands JP, Bennett IL (1973) Stocking intensity and pastoral production. I. Changes in the soil and vegetation of a sown pasture grazed by sheep at different stocking rates. The Journal of Agricultural Science 81, 193–204. open url image1

Leeper GW (1957) ‘Introduction to soil science.’ 3rd edn. (Melbourne University Press: Melbourne)

Lloyd-Davis H (1962) Intake studies in sheep involving high fluid intake. Proceedings of Australian Society of Animal Production 4, 167–171. open url image1

McAlpine JR (1970) Estimating pasture growth periods and droughts from simple water balance models. In ‘Proceedings of the 11th International Grasslands Congress. Surfers Paradise, Queensland’. pp. 484–487. (University of Queensland Press: Brisbane)

Martin FM (1978) Simulation of pasture water relationships and pasture growth by a mathematical model. Masters thesis. La Trobe University, Melbourne.

Monteith JL (1981) Does light limit crop production? In ‘Physiological processes limit plant productivity’. (Ed. CB Johnson) pp. 23–38. (Butterworths: London)

Newell JW (1962) The soils of the Hamilton Pastoral Research Station, Victoria. Technical Bulletin No.15, Department of Agriculture, Victoria.

Radcliffe JE , Baars JA (1987) The productivity of temperate grasslands. In ‘Ecosystems of the world: 17B. Managed grasslands’. (Ed. RW Snaydon) pp. 7–17. (Elsevier Scientific Publishing: Amsterdam)

Reed KFM (1974) The productivity of pastures sown with Phalaris tuberosa or Lolium perenne. I. Pasture growth and composition. Australian Journal of Experimental Agriculture and Animal Husbandry 14, 640–648.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Richter J (1980) A simple numerical solution for the vertical flow equation of water through unsaturated soils. Soil Science 129, 138–144. open url image1

Snaydon RW (1981) The ecology of grazed pasture. In ‘World animal science B1’. (Ed. FHW Morley) pp. 13–31. (Elsevier: Amsterdam)

Snaydon RW (1987) General introduction. In ‘Ecosystems of the world: 17B. Managed grasslands’. (Ed. RW Snaydon) pp. 7–17. (Elsevier Scientific Publishing: Amsterdam)

Stockdale CR (1983) Irrigated pasture productivity and its variability in the Shepparton region of northern Victoria. Australian Journal of Experimental Agriculture and Animal Husbandry 23, 131–139.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Vickery PJ , Nicol GR (1982) An improved electronic capacitance meter for estimating pasture yield: construction details and performance tests. Animal Research laboratories Technical Paper No.9. CSIRO, Australia.

Vickery PJ, Bennett IL, Nicol GR (1980) An improved electronic capacitance meter for estimating herbage mass. Grass and Forage Science 35, 247–252. open url image1

Walsh GL, Birrell HA (1987) Seasonal variations in the chemical composition and nutitive value of five pasture species in south-western Victoria. Australian Journal of Experimental Agriculture 27, 807–816.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Wallach D, Gutman M (1976) Environment-dependent logistic equations applied to natural pasture growth curves. Agricultural Meteorology 16, 389–404.
| Crossref | GoogleScholarGoogle Scholar | open url image1

White DH, McConchie BJ, Curnow BC, Termouth AH (1980) A comparison of levels of production and profit from grazing Merino ewes and wethers at various stocking rates in northern Victoria. Australian Journal of Experimental Agriculture and Animal Husbandry 20, 296–307.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Willatt ST, Pullar DM (1984) Changes in soil physical properties under grazed pastures. Australian Journal of Soil Research 22, 343–348.
| Crossref | GoogleScholarGoogle Scholar | open url image1