الفهرس 
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Abstract
This investigation was conducted during two consecutive seasons (2018 and 2019) on 7-year-old Washington Navel orange (Citrus sinensis L. Osbeck) trees budded on Volkamariana rootstock planted at 4× 5 meters apart, received normal horticultural practices and grown in sandy soil under drip irrigation system at El- Nubaria region, El- Behera governorate, Egypt. It was aimed to investigate the influence of shading nets or foliar application of potassium silicate and their combination in relation to vegetative growth, fruit set, drop, yield, leaf elements content and fruit quality on Washington Navel orange. Forty uniform trees were selected for this study and all of them were subjected to the same cultural practices during both successive seasons. This experiment consisted of ten treatments were applied and arranged in a randomized complete block design with four replicates for each treatment and one tree for each replicate.
The treatments were as follows:
T1:
Tap water spray without shad net (control).
T2:
Shading net (30%) from 15th April to 1st September.
T3:
Shading net (65%) from 15th April to 1st September.
T4:
Shading net (75%) from 15th April to 1st September.
T5:
Shading net (30%) from 15th April to 1st September with Foliar application of potassium silicate.
T6:
Shading net (65 %) from 15th April to 1st September with Foliar application of potassium silicate.
T7:
Shading net (75 %) from 15th April to 1st September with Foliar application of potassium silicate.
T8:
Foliar application of potassium silicate one time at 1st April at the rate of 5 cm/l water.
T9:
Foliar application of potassium silicate two times at 1st April and 1st June at the rate of 5 cm/l water.
T10:
Foliar application of potassium silicate three times at 1st April, 1st June and 1st August at the rate of 5 cm/l water.