EFFECTS OF ALTERNATIVES TO HYDROGEN CYANAMIDE ON COMMERCIAL KIWIFRUIT PRODUCTION

G. Hernández , R.L. Craig
The restriction of Hydrogen Cyanamide (HC) for dormancy interruption of kiwifruit in the European Union leads to a concern among many New Zealand growers, who wonder how long will HC be available in their market. A completely randomized block trial in the Auckland region (New Zealand) compares the performance of two available alternative dormancy breaking treatments - Erger® (ER) and Armobreak® (AB) - with HC - HiCane® - and with the untreated control on green kiwifruit (Actinida deliciosa var. deliciosa ‘Hayward’). After a winter chill period of 1653 Richardson Chill Units, ER advanced significantly bud-break, whereas HC induced a delay. ER also advanced flowering, whereas HC and AB induced a delay. ER however showed the most spread bud-break and flowering. AB and ER induced a significantly lower percentage of winter buds (WB) to break than HC, performing however significantly better than the control. ER and AB grew significantly more inflorescences per winter bud (Kfl/WB), than HC and the control. AB and ER induced less lateral flowers than the control, however more than HC. The higher amount of inflorescences and laterals may lead to a higher need of thinning of these vines, and the possibility of not achieving such high yields or large fruit sizes as using HC. These alternatives induced significantly higher levels of fruit quality parameters such as SSC (soluble solid content) and DM (dry matter), possibly as a result of the modification of the date of bud-break and flowering.
Hernández , G. and Craig, R.L. (2011). EFFECTS OF ALTERNATIVES TO HYDROGEN CYANAMIDE ON COMMERCIAL KIWIFRUIT PRODUCTION. Acta Hortic. 913, 357-363
DOI: 10.17660/ActaHortic.2011.913.47
https://doi.org/10.17660/ActaHortic.2011.913.47
Actinida deliciosa, bud-break, flowering, HiCane®, Dormex®, ArmobreakTM, Erger®
English

Acta Horticulturae