الفهرس 
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Abstract
This study was carried out during 2013 and 2014 seasons on one hundred and twenty Flame seedless grapevines grown in a private vineyard located at Kom El- Arab village, Matay district, Minia Governorate where the texture of the soil is clay.
The selected vines are planted at 2×3 meters apart. The chosen vines were trained by spur (short pruning) pruning system leaving 72 buds/vine (15 fruiting spurs × 4 buds plus six replacement spurs/ two buds) using Gable supporting method. Winter pruning was carried out at the last week of December. during both seasons. Surface irrigation system was followed using Nile water.
This study was planned to examine the effect of different concentrations and frequencies of potassium silicate as a source of silicon on growth and fruiting of Flame seedless grapevines.
Except those dealing with the present treatments (application of silicon compounds), the selected vines received the usual horticultural practices that are commonly applied in the vineyard.
Conclusions:-
Under the experimental and resembling conditions as well as from economical point of view, it is suggested to use potassium silicate via foliage thrice (at growth start, just after berry setting and at 14 days later) at 0.2% for improving yield, fruit quality and at the same time, reasonably overcoming the problem of irregular berries coloration of Flame seedless grapevines.