New Zealand Journal of Crop and Horticultural Science
abstracts
Yield comparisons of old and new cultivars of swedes (Brassica napus ssp. napobrassica)
in Southland, New Zealand
S. Gowers
R. Butler
New Zealand Institute for Crop & Food Research Limited
Private Bag 4704
Christchurch, New Zealand
email: gowerss@crop.cri.nz
S. D. Armstrong
New Zealand Institute for Crop & Food Research Limited
P.O. Box 273
Gore, New Zealand
Abstract Yield trials of swedes (Brassica napus ssp. napobrassica)
were analysed to compare the performance of recently released cultivars with
the older cultivars they have replaced. Data from 1993/94 to 1997/98 were analysed
using a mixed model analysis and G*E effects were examined. The recently released ‘Major
Plus’ produced the highest fresh weight yield of bulb, 105 t/ha, 15% higher
than ‘Doon Major’, the low dry matter (DM) cultivar that it has replaced. ‘Highlander’ had
over 14% higher bulb DM yield than ‘Doon Major’ and the other main
crop cultivars that have been replaced. ‘Tina’, the older cultivar
with good clubroot and dry rot resistance, had a low yield. ‘Winton’ was
bred to combine the disease resistance of ‘Tina’ with the yield of ‘Highlander’;
it produced a bulb dry yield 5% higher than ‘Highlander’ and 47%
higher than ‘Tina’. Estimates of total dry weight yield gave similar
results and over the trial environments and years examined ‘Winton’ was
also the most stable cultivar for total dry weight yield.
Keywords swedes; Brassica napus ssp. Napobrassica; yield
trials; Southland
New Zealand Journal of Crop and Horticultural Science, 2006, Vol. 34:
109–114
0014–0671/06/3402–0109 © The Royal
Society of New Zealand 2006
H05035; Online publication date 12 April 2006. Received 7 April 2005;
accepted 21 December 2005
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