New Zealand Journal of Crop and Horticultural Science abstracts
Effects of hydrogen cyanamide on budbreak and flowering in kiwifruit
(Actinidia deliciosa `Hayward')
H. G. MCPHERSON
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
A. C. RICHARDSON
The Horticulture and Food Research
Institute of New Zealand Ltd
Kerikeri Research Centre
P. O. Box 23
Kerikeri, New Zealand
email: arichardson@hortresearch.co.nz
W. P. SNELGAR
M. B. CURRIE
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
Abstract Effects of hydrogen cyanamide (HC) application to
kiwifruit (
Actinidia deliciosa (A. Chev.) C.F. Liang et A. R. Ferguson
`Hayward') vines were assessed over four seasons (1996-99) in three New Zealand
kiwifruit-growing areas. HC advanced the date of budbreak to c. 40 days after
application, despite the date of application varying from 33 to 92 days before
natural budbreak. For every day that HC advanced budbreak, there was a 0.5-day
advance in the date of flowering (
r2 = 0.92). The smaller
advance in flowering resulted from the cooler temperatures experienced between
budbreak and flowering in the treated vines. HC applications tended to reduce
the spread of budbreak and flowering, with the greatest effect at the warmest
sites. Application of HC usually increased budbreak and the total number of
flowers at the warmest two sites, but only slightly reduced their seasonal
variation as this was largely the result of the amount of winter chilling vines
received. The number of flowers per winter bud produced by untreated vines was
reduced by 0.44 per 1deg.C. The percentage of total flowers that were lateral
or side flowers was reduced by HC application from 14 to 4% at the warmest site
and 29 to 19% at the coolest site.
Keywords kiwifruit; Actinidia deliciosa; hydrogen
cyanamide; Hi-Canereg.; Dormexreg.; budbreak; flowering;
phenology
H01011
Received 19 March 2001; accepted 20 August 2001
New Zealand Journal of Crop and Horticultural Science, 2001, Vol. 29:
277-285
0014-0671/01/2904-0277 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (618K); (scanned from paper original: notes about this process)
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