New Zealand Journal of Crop and Horticultural Science abstracts
Time of flowering and pollination in some New Zealand
chestnut selections, and introduced cultivars
D. J. KLINAC
J. F. LELIEVELD
The Horticulture and Food Research
Institute of New Zealand
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
R. D. KNOWLES
Japanese Chestnuts NZ Ltd
Reid Road
R D 2, Ohaupo, New Zealand
Abstract The flowering of 32 New Zealand chestnut
(Castanea spp.) selections and introduced cultivars, growing in the
Waikato region of New Zealand, was monitored over three consecutive seasons.
Dates of anthesis and stigma emergence and expansion were noted, and a range of
early-late flowering chestnuts identified. For the important New Zealand
commercial selections `1002', `1005', `1007', `1011', and `1015', the timing of
the optimum pollination period was assessed using a time-sequence bagging trial
and estimated to have occurred from c.1 to 10 January 1994. This was later than
most pollen release and may help explain the low and variable levels of nut
production often observed in the field. Nut production generally increased with
the length of time for which stigmas were exposed for open pollination. In
selection `1005', exposure for 1 week was too short for any successful
pollination to occur. A single application of hydrogen cyanamide (Hicanereg.)
at 3% a.i. on 10 August 1993 advanced the time of leaf emergence and the time
of flowering in all five New Zealand chestnut selections tested.
Keywords chestnuts; Castanea; flowering; pollination;
hydrogen cyanamide
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
331-340
0114-0671/95/2303-0331 $2.50/0 (c) The Royal Society of New Zealand
1995
PDF file of entire paper: medium quality (796K); (scanned from paper original: notes about this process)
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