الفهرس 
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Abstract
This study was conducted during 2014 and 2015 seasons on 48 nearly uniform and similar in vigour 12- years old Balady mandarin trees (Citrus reticulata L. Blanco) budded on sour orange rootstock in a private orchard located at El- Shorafa village at eastern bank of Minia city, Minia Governorate where the soil is silty clay and well drained and with a water table not less than two meters deep. The selected trees planted at 4x4 meters apart. Surface irrigation system was followed.
The target of this study was examining the effect of single and combined applications of boric acid and potassium silicate on vegetative growth characteristics, yield and fruit quality of Balady mandarin trees grown under Minia region conditions.
Treating Balady mandarin trees grown under Minia region and the resembling conditions three times at growth start, just after fruit setting and at two months later with a mixture of boric acid at 0.05 % plus potassium silicate at 0.1% was necessary for promoting yield and fruit quality.