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The contribution of seed survival to yield in new Australian cultivars of oil-seed rape (Brassica napus)

Published online by Cambridge University Press:  27 March 2009

N. J. Mendham ,
J. Russell  and
G. C. Buzza
N. J. Mendham
Affiliation:
Department of Agricultural Science, University of Tasmania, G.P.O. Box 252C, Hobart, Tasmania, 7001, Australia
J. Russell
Affiliation:
Tasmanian Department of Agriculture, Mt Pleasant Laboratories, P.O. Box 46, Launceston South, Tasmania, 7250, Australia
G. C. Buzza
Affiliation:
Victorian Department of Agriculture, State Research Farm, Werribee, Victoria, 3030, Australia
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Summary

A series of experiments in Tasmania examined the growth, development, yield and components of yield of new Australian oil-seed rape cultivars from Victoria and Western Australia. The highest yields obtained were around 5·5 t seed/ha, from an autumn sowing with supplementary irrigation. Spring sowings with irrigation or autumn sowings without produced up to 4 t/ha. The Victorian lines with Japanese parentage clearly outyielded the Western Australian cultivars or Midas, a widely grown Canadian cultivar. When autumn sown, the Victorian lines grew more rapidly at low temperature, which under conditions of later stress contributed to a high yield relative to the other cultivars. However, the most consistent feature from both autumn and spring sowing was high rates of seed survival, up to near the potential number of around 30 per pod, giving very large numbers of seeds per m2. While individual seeds in the Victorian lines, particularly Marnoo, were smaller than in Midas, oil content remained high except under extreme stress in the later stages of seed development.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 103 , Issue 2 , October 1984 , pp. 303 - 316
Copyright
Copyright © Cambridge University Press 1984

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References

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