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RESEARCH ARTICLE

Effect of defoliation on spring-sown winter-type canola (Brassica napus) grain yield, quality and morphology

M. C. Raeside https://orcid.org/0000-0003-2566-974X A C , J. Byron A , F. Cameron A , C. MacDonald A , D. L. Partington A , G. A. Kearney B and R. Behrendt https://orcid.org/0000-0003-2545-4482 A
+ Author Affiliations
- Author Affiliations

A Agriculture Victoria Research, Department of Jobs, Precincts and Regions, 915 Mt Napier Road, Hamilton, Vic. 3300, Australia.

B Biometrics Consultant, Paynes Road, Hamilton, Vic. 3300, Australia.

C Corresponding author. Email: margaret.raeside@agriculture.vic.gov.au

Animal Production Science 61(11) 1129-1136 https://doi.org/10.1071/AN20123
Submitted: 6 March 2020  Accepted: 1 May 2020   Published: 23 June 2020

Abstract

Context: In Australia’s high-rainfall zone (>550 mm/year), winter-type canola (Brassica napus L.) can be sown in spring and grazed as a forage crop during its vegetative phase, producing a canola grain crop in late spring of the second year. The timing, length and intensity of grazing or defoliation that can be imposed on canola before a grain yield penalty occurs remains largely unknown.

Aim: Our research aimed to determine the impact of grazing spring sown canola during summer and autumn on the subsequent canola grain yield.

Methods: A paddock-scale field experiment was conducted over 2 years, 2013–14 and 2015–2016, at Hamilton, Victoria, Australia, with two winter-type canola treatments and three grazing–defoliation sub-treatments replicated four times in a replicated block design. The canola cultivars used were Hyola971CL and Taurus in 2013–14 and Hyola971CL and Brazzil in 2015–16. The three grazing–defoliation sub-treatments were: NG, no grazing; VG, grazing with sheep for a 10-week period during the vegetative phase over summer–autumn; RG, grazing with sheep as per the VG sub-treatment and then in the reproductive phase, either cutting the canola for silage in August (2013–14) or grazing with sheep between 28 July and 17 August 2016 (2015–16).

Key results: The VG sub-treatment resulted in no grain-yield penalty (P > 0.05) relative to NG in either year. In 2014, canola grain yields from VG for Hyola971CL and Taurus were 2.32 and 2.13 t/ha, compared with NG grain yields of 2.66 and 2.19 t/ha. In 2016, grain yields from VG for Hyola971CL and Brazzil were 2.14 and 1.74 t/ha, compared with NG grain yields of 1.87 and 1.90 t/ha. The RG sub-treatment reduced (P < 0.05) canola grain yield by ~65% in 2014 and 80% in 2016 compared with NG and VG.

Conclusions: Spring-sown winter-type canola can be grazed during summer and autumn in southern Australia with no grain-yield penalty relative to ungrazed canola. However, further grazing or defoliation in winter once bud elongation commences can result in large grain-yield penalties.

Implications: Spring-sown winter-type canola is a viable forage option for filling the summer–autumn feed gap in southern Australia while also providing a dual-purpose income in mixed-farming systems.

Additional keywords: cropping, livestock, mixed farming, pasture.


References

Anderson G, Chen W, Bell R, Brennan R (2015) Making better fertiliser decisions for cropping systems in Western Australia. Soil test–crop response relationships and critical soil test values and ranges. Bulletin No. 4865. Department of Agriculture and Food, Western Australia, South Perth, W. Aust.

Berry PM, Spink JH (2006) Centenary review. A physiological analysis of oilseed rape yields: past and future. The Journal of Agricultural Science 144, 381–392.
Centenary review. A physiological analysis of oilseed rape yields: past and future.Crossref | GoogleScholarGoogle Scholar |

Christy B, O’Leary G, Riffkin P, Acuna T, Potter T, Clough A (2013) Long-season canola (Brassica napus L.) cultivars offer potential to substantially increase grain yield production in south-eastern Australia compared with current spring cultivars. Crop and Pasture Science 64, 901–913.
Long-season canola (Brassica napus L.) cultivars offer potential to substantially increase grain yield production in south-eastern Australia compared with current spring cultivars.Crossref | GoogleScholarGoogle Scholar |

Freer M, Moore AM, Donnelly JR (1997) GRAZPLAN: decision support systems for Australian grazing enterprises: II. The animal biology model for feed intake, production and reproduction and the GrazFeed DSS. Agricultural Systems 54, 77–126.
GRAZPLAN: decision support systems for Australian grazing enterprises: II. The animal biology model for feed intake, production and reproduction and the GrazFeed DSS.Crossref | GoogleScholarGoogle Scholar |

Heenan DP, Armstrong EL (1993) Sowing time effects on yield and quality of canola and linseed. In ‘Proceedings of the 9th Australian Research Assembly on Brassicas’. Wagga Wagga, NSW. (Eds N Wratten, RJ Mailer) pp. 83–86. (Australian Oilseeds Federation: Sydney)

Hodgson J, Baker RD, Davies A, Laidlaw AS, Leaver JD (1981) ‘Sward measurement handbook.’ (British Grassland Society: Maidenhead, UK)

Kirkegaard JA, Sprague SJ, Dove H, Kelman WM, Marcroft SJ, Lieschke A, Howe GN, Graham JM (2008) Dual-purpose canola: a new opportunity in mixed farming systems. Australian Journal of Agricultural Research 59, 291–302.
Dual-purpose canola: a new opportunity in mixed farming systems.Crossref | GoogleScholarGoogle Scholar |

Kirkegaard JA, Sprague SJ, Hamblin PJ, Graham JM, Lilley JM (2012) Refining crop and livestock management for spring canola (Brassica napus). Crop and Pasture Science 63, 429–443.
Refining crop and livestock management for spring canola (Brassica napus).Crossref | GoogleScholarGoogle Scholar |

Lunn GD, Spink JH, Stokes DT, Wade A, Clarke RW, Scott RK (2001) Canopy management in winter oilseed rape. HGCA Project Report No. OS49. Home-Grown Cereals Authority, London.

Mailer RJ, Pratley JE (1990) Field studies of moisture availability effects on glucosinolate and oil concentration in seed rape (Brassica napus L.) and turnip rape (Brassica rapa L. var silvestris (Lam.) Briggs). Canadian Journal of Plant Science 70, 399–407.
Field studies of moisture availability effects on glucosinolate and oil concentration in seed rape (Brassica napus L.) and turnip rape (Brassica rapa L. var silvestris (Lam.) Briggs).Crossref | GoogleScholarGoogle Scholar |

NHMRC (2013) ‘Australian code for the care and use of animals for scientific purposes.’ 8th edn. (National Health and Medical Research Council: Canberra, ACT)

Paridaen A, Kirkegaard JA (2015) Forage canola (Brassica napus): spring-sown winter canola for biennial dual-purpose use in the high-rainfall zone of southern Australia. Crop and Pasture Science 66, 275–286.
Forage canola (Brassica napus): spring-sown winter canola for biennial dual-purpose use in the high-rainfall zone of southern Australia.Crossref | GoogleScholarGoogle Scholar |

Raeside MC, Byron J, Cameron F, MacDonald C, Partington DL, Kearney GA, Behrendt R (2020a) Spring-sown winter-type canola (Brassica napus) as summer–autumn forage for sheep production in southern Australia. Animal Production Science.
Spring-sown winter-type canola (Brassica napus) as summer–autumn forage for sheep production in southern Australia.Crossref | GoogleScholarGoogle Scholar |

Raeside MC, Byron J, Cameron F, MacDonald C, Rochfort S, Partington DL, Kearney GA, Behrendt R (2020b) Effect of grazing different forage systems prior to and during mating on the liveweight, condition score, conception and reproductive rate of maternal-composite ewe lambs. Animal Production Science.
Effect of grazing different forage systems prior to and during mating on the liveweight, condition score, conception and reproductive rate of maternal-composite ewe lambs.Crossref | GoogleScholarGoogle Scholar |

Riffkin P, Potter T, Kearney G (2012) Yield performance of late-maturing winter canola (Brassica napus L.) types in the High Rainfall Zone of southern Australia. Crop and Pasture Science 63, 17–32.
Yield performance of late-maturing winter canola (Brassica napus L.) types in the High Rainfall Zone of southern Australia.Crossref | GoogleScholarGoogle Scholar |

Riffkin P, Christy B, O’Leary G, Partington D (2016) Contribution of phase durations to canola (Brassica napus L.) grain yields in the High Rainfall Zone of southern Australia. Crop and Pasture Science 67, 359–368.
Contribution of phase durations to canola (Brassica napus L.) grain yields in the High Rainfall Zone of southern Australia.Crossref | GoogleScholarGoogle Scholar |

Robertson M, Kirkegaard J, Peake A, Creelman Z, Bell L, Lilley J, Midwood J, Zhang H, Kleven S, Duff C, Lawes R, Riffkin P (2016) Trends in grain production and yield gaps in the high-rainfall zone of southern Australia. Crop and Pasture Science 67, 921–937.
Trends in grain production and yield gaps in the high-rainfall zone of southern Australia.Crossref | GoogleScholarGoogle Scholar |

Si P, Mailer RJ, Galwey N, Turner DW (2003) Influence of genotype and environment on oil and protein concentrations of canola (Brassica napus L.) grown across southern Australia Crop and Pasture Science 54, 397–407.
Influence of genotype and environment on oil and protein concentrations of canola (Brassica napus L.) grown across southern AustraliaCrossref | GoogleScholarGoogle Scholar |

Sprague SJ, Kirkegaard JA, Graham JM, Bell LW, Seymour M, Ryan M (2015) Forage and grain yield of diverse canola (Brassica napus) maturity types in the high rainfall zone of Australia. Crop and Pasture Science 66, 260–274.
Forage and grain yield of diverse canola (Brassica napus) maturity types in the high rainfall zone of Australia.Crossref | GoogleScholarGoogle Scholar |

Sylvester-Bradley R, Makepeace RJ (1984) A code for stages of development in oilseed rape (Brassica napus L.). Aspects of Applied Biology 6, 399–419.

Tocker J, Behrendt R, Raeside M, Malcolm B (2020) The impact of ewe lamb mating and different feeding strategies over summer–autumn on profit and risk: a case study in south-west Victoria. Animal Production Science.
The impact of ewe lamb mating and different feeding strategies over summer–autumn on profit and risk: a case study in south-west Victoria.Crossref | GoogleScholarGoogle Scholar |

VSN International Ltd (2016) Genstat version 18.2.0.18409.

Ward GN, Clark SG, Kearney GA, McCaskill MR, Raeside MC, Lawson AR, Behrendt R (2013) Summer-active perennials in pasture systems improve seasonal pasture distribution without compromising winter–spring production. Crop and Pasture Science 64, 673–686.
Summer-active perennials in pasture systems improve seasonal pasture distribution without compromising winter–spring production.Crossref | GoogleScholarGoogle Scholar |