الفهرس 
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Abstract
The present investigation was carried out in the seasons 1987 and 1988 on white binary seedless grapevines 15 years old planted at 2x2 meters and trained with head
Pruning system in a vineyard in mate province (mania governorate).the soil is well drained with a water table not less than two meters deep and salty clay in texture.
The main objectives of this work were to study the response of vines to fertilization with nitrogen and combined application of zinc, iron and manganese as well as gibberellic acid. This response was evaluated in terms of some vegetative growth
Characters leaf chemical composition and fruiting characteristics. Three nitrogen rates were applied to the vines namely 50m, 100 and 150g per vine in the from of ammonium nitrate (33.5%N) fertilizer. Each nitrogen rate was dividing in to three batches and applied at three fixed dates. The first was at the beginning of vegetative
Growth, the second at first bloom and the third two weeks after fruit set.