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ISHS Acta Horticulturae 1130: XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposia on the Physiology of Perennial Fruit Crops and Production Systems and Mechanisation, Precision Horticulture and Robotics

Effects of alternatives to hydrogen cyanamide on commercial 'Hayward' kiwifruit production

Authors:   G. Hernández, R.L. Craig
Keywords:   Actinida deliciosa, budbreak, flowering, HiCane®, Dormex®, ArmobreakTM, Erger®
DOI:   10.17660/ActaHortic.2016.1130.19
Abstract:
The restriction of hydrogen cyanamide (HC) for dormancy interruption of kiwifruit in the European Union leads to a concern among many New Zealand growers about how long the product will be available in their market. A completely randomized block experiment in Auckland region compares the performance of two available alternative dormancy breaking treatments of 'Hayward' green kiwifruit (Actinida deliciosa var. deliciosa 'Hayward'); Erger® (ER) and Armobreak® (AB) with HiCane® (HC) and with an untreated control. Bud break and flowering was studied during three years of different winter chill, ranging from 622 h below 7°C of the 2009 winter to only 301 of the 2011 winter. 'Hayward' kiwifruit shows large sensitivity to winter chill variations. The alternatives to HC improved the percentage of budbreak (%BB) and achieved more inflorescences per winter bud (KFl WB-1) after high winter chilling. After medium and mild winter chilling, even though the response compared with the control was always improved, the alternatives of HC were less effective than HC.

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1130_18     1130     1130_20

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