Study on the Effect of Two Dormancy Breaking Agents on Anna Apple Trees

Abstract

The effect of (Dorcy 50% * ) and Buddy ** was studied on percentage of developing buds, diameter of fruits and fruit characters of Anna apple trees budded on MM.106 during two seasons of (1998-1999) and (1999-2000).Treatments of Dorcy 50% and Buddy separately or together accelerated bud burst comparing with untreated trees (control).Results were obtained treatments by Buddy 5%, Buddy 5% plus 0.5 % (Dorcy 50%) or 3 % (Dorcy 50%) showed increase in fruit set, in the two seasons of the experiment.The last three treatments caused an increase in fruit weight, size, diameter, and height.The treatments Buddy 5% and Buddy 5% plus 0.5 % (Dorcy 50%) gave highest value of total soluble solids, while control gave the lowest value.Untreated trees gave fruits with highest value of firmness and percentage of acidity, while fruits of trees treated with 3 % (Dorcy 50), and Buddy 5% alone or together were less in firmness and percentage of acidity.* Dorcy 50% : a tread name of hydrogen cyanamide 49%. ** Buddy : 2-chloroethylphosphonic acid 10 g/l Adjuvants and oil to 1000 ml.