New Zealand Journal of Crop and Horticultural Science abstracts
An efficient sampling scheme for monitoring flowering of Actinidia chinensis
W. P. Snelgar
The Horticulture and Food Research
Institute of New Zealand Ltd
Te Puke Research Centre
No. 1 Road, RD 2
Te Puke, New Zealand
M. Davy
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
H. R. Paul
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
Abstract Flowering data from four vines of Actinidia chinensis (Planch.) var. chinensis ‘Hort16A’ and three vines of A. chinensis
‘37-3-18A’ (‘18A’) were used to develop a robust and efficient scheme to
monitor flowering. The frequency distribution of flowering for ‘Hort16A’
flowers was normal. Although the distribution of flowering for ‘18A’ terminal
flowers was not normal, assuming normality produced estimates of the date
and standard deviation of mid bloom within 1 day of the true value. Three
schemes for selecting shoots for monitoring flowering in A. chinensis
vines were tested. The accuracy of flowering estimates was proportional to
the number of shoots monitored and although totally random selection of shoots
was slightly more accurate, stratified random and systematic sampling was
more practical. Flowering can be monitored at 4-day, rather than 2-day intervals
without affecting the accuracy of estimates. For the two cultivars we tested,
monitoring flowering on 60 shoots selected using the stratified random and
systematic scheme will result in estimates of mid bloom within ±1
day of the true value on 80-95% of occasions. This corresponds to a sampling
intensity of c. 3-4% of the total number of terminal flowers on the vine,
or 140-290 flowers/population.
Keywords flowering; sampling; synchrony; duration; monitoring; Actinidia chinensis
H02021 Received 25 February 2002; accepted 17 June 2002; published 25 September 2002
New Zealand Journal of Crop and Horticultural Science, 2002, Vol. 30: 187-195
0014-0671/02/3003-0187 $7.00 © The Royal Society of New Zealand 2002
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