الفهرس 
Effect of some pruning treatments on olinda orange
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Abstract
The current study was carried ant during two successive seasons (2011/12 and 2012 /13). Valencia orange cv. Olinda budded on Volkamerina rootstock. 8 years old trees growing in sandy soil under drip irrigation system at Wadi Elnaturon region, Behira governorate. The present investigation aimed to study the effect of pruning severity and time of application on vegetative growth, flowering and fruiting of Valencia orange. The study including three pruning levels (removing 15, 30 and 45% of tree canopy) the pruning was applied in March and July. Pruning treatments improved vegetative growth, in both of spring, summer and autumn growth cycle compared with control treatment in both seasons. Leaf number was increased in spring and summer growth cycle with increasing pruning severity compared with the unpruned trees. Leaf area was significantly improved with all pruning treatment in the different growth cycles in both seasons. Pruning treatment at 30% resulted in the highest number of flowers and leafy inflorescence in both seasons. Fruit set was greatly improved with increasing pruning severity compared with the untreated trees. Also, fruit retention increased with increasing pruning severity in both seasons. Pruning level at 15% reduced fruit DROP in the first seasons while in the second seasons the sever pruning reduced fruit DROP percentage pruning level at 15% during July resulted in the highest fruit yield (128.67 kg /tree) while in the 2nd season pruning level 30% in July produced the highest tree yield (134.7kg/tree) compared with control treatment (67.33 and 76.7 during both seasons respectively)