Effects of Girdling and Hydrogen Cyanamide on Bud Break of Kiwifruit cv. Bruno (<I>Actinidia deliciosa </I> C. F. Liang et. A. R. Ferguson)

Abstract

A study on cane girdling of kiwifruit cv. Bruno was conducted. The one-year-old cane with 8 buds per cane were chosen to permit uniform for each treatment in the same vine during the onset of dormancy on year 2007 and 2008. Dose of 4% hydrogen cyanamide was sprayed to run off before dormancy had broken, while the another experiment compared girdling without hydrogen cyanamide spraying. These experiments were investigated on Randomized Complete Block Design at Inthanon Royal Agricultural Station and Angkhang Royal Agricultural Station, consisted of 5 girdling treatments contorl, girdling at proximal end of one-year-old cane, girdling on two-year-old cane, girdling on proximal and distal end of one-year-old cane, and six internode girdling. The results showed that all of girdling treatments with spraying hydrogen cyanamide increased percent bud break from those with girdling only. The internode girdling means affected increasing the bud break significantly difference. Bud emerged from bud position on cane from the distal end and decreased gradually at the proximal end. Whereas the experiment designed on the healthy vines stimulated emergence of bud on the proximal end. The period of bud breaking was not differed from the various positions of bud on those canes.