الفهرس 
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Abstract
This study was carried out during 2005 and 2006 seasons on 15-year-old Thompson Seedless grapevines growing at EL-Dear village near Aga City, Dakahlia Governorate, Egypt. The vines were planted at 2 m between vines and 2.5 m between raws using cane-pruning under head trellis system with three vertical wires. -This investigation aimed to study the effect of potassium and magnesium as soil fertilization on bud behavior, vegetative growth, yield, fruit quality and leaf mineral content of Thompson Seedless grapevines. This study revealed the following results : 1-Treating Thompson Seedless grape with potassium sulphate at 150 g with magnesium sulphate at 60 g per vine gave a higher yield per vine and per feddan. 2-The data also reveal that, the higher level of potassium fertilization (150 or 225 g/vine) with magnesium sulphate at 60 g per vine increased both SSC and SSC/acid ratio in berry juice. 3-Vines treated with potassium sulphate at 225 g with 60 g magnesium sulphate increased both bud burst and fertility.