New Zealand Journal of Crop and Horticultural Science abstracts
Effect of cyanamide on budbreak and cane fruitfulness
for `Hayward' kiwifruit in relation to cane length and time of
application
P. INGLESE
G. GULLO
L. S. PACE
Dipartimento di Agrochimica ed Agrobiologia
Università degli Studi di Reggio Calabria
89061 Reggio Calabria
Italy
Abstract Hydrogen cyanamide is used in areas with inadequate
winter chilling to increase fertility and budbreak uniformity in many fruit
tree species. This study examined the effect of hydrogen cyanamide (Dormex) on
budbreak of Actinidia deliciosa `Hayward' in relation to time of
application and cane length. Treatment times were 8, 6, 4, and 2 weeks before
expected budbreak. For each application time, 6-, 12-, or 18-bud long canes
were treated. Treatments were arranged in a complete randomised block design
with five plants per treatment time. Canes treated 8 and 6 weeks before
expected budbreak reached the advanced open cluster stage 15-35 days earlier
than untreated canes. Cyanamide shortened the time-lapse from bud swelling to
cluster opening in all the treatments dates and increased cane fruitfulness by
increasing the number of flowers per bud and per fruiting shoot. The earliest
application enhanced budbreak but did not significantly increase the percentage
of fruitful buds, whereas the percentage of flowering shoots in canes treated 2
weeks before expected budbreak was double than that of untreated canes,
regardless the cane length. A significant interaction occured between cane
length and treatment date. Untreated canes produced the largest shoots.
Keywords Actinidia deliciosa; hydrogen cyanamide; chilling; shoot
growth
H97-1
Received 7 January 1997; accepted 2 December 1997
Short communication
PDF file of entire paper: medium quality (546K); (scanned from paper original: notes about this process)
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