Effect of some summer pruning and paclobutrazol treatments on spurs state and fruit characteristics of El-Amar apricot trees
2006
Muhammad, Samira M. | Fayed, Tareq A. | Husain, Attef M.
This study was conducted in (2002/2003 and 2003/2004), to evaluate the effect of some summer pruning treatments on old branches (two years old or more) [thinning branches (removing 1/3 branches number) and shortening (topping 1/3 branches length)] and/or spraying paclobutrazol (PP333) at 1000 ppm in addition to a combination between them on 15th Jul. and 15th Aug. besides untreated trees, of El-Amar apricot cultivar as control. Data showed that the triple-combined treatment (thinning + shortening + PP333) gave the highest significant values recorded for numbers of spurs formed on branches (10.17 and 11.64). Distribution of fruit spurs along the branches in all treatments was highest in the terminal part of the branch followed by the median then the basal part, respectively. Yield/tree increased by all the treatments but, the highest yields were obtained from the triple combined treatment in 15 Jul. (7.375 and 8.631) in the two seasons, respe ctively. Fruit physical characters (fruit weight, size and firmness) were significantly increased by the same treatment compared with other treatments and control trees. TSS % was significantly increased but acidity was not affected by all treatments. Chemical analysis revealed a high content of total carbohydrates, C/N ratio, indols and phenols. All treatments in 15 Jul. were more significant than 15 Aug.
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