الفهرس 
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Abstract
This study was carried out during 2015 and 2016 seasons on thirty uniform in vigour 9 - years old Superior grapevines grown in a private vineyard located at El- Hawatra village, Minis district, Minia Governorate where the texture of the soil is clay, well drained and water table not less than two meters deep. All the selected vines are planted at 2 x 3 m apart. The chosen vines (30 vines) were pruned during the first week of January in both seasons using cane pruning method. The vines were trellised by Gable system. Vine load was 84 eyes for all the selected vines (on the basis of 6 fruiting canes x 12 eyes plus 6 renewal spurs X two eyes). Surface irrigation system was followed using Nile water containing 160 ppm EC.
The main target of this study was examining the effect poultry manure tea as well as ascorbic acid as partial replacements of inorganic N fertilizers in Superior vineyards. selecting the best proportion of inorganic N fertilizer poultry manure tea and ascorbic acid resulted higher production is considered another target.
Under the experimental and resembling conditions, it is recommended to fertilize Superior grapevines with N (60 g N/ vine/ year) via 50% inorganic N plus spraying poultry manure tea at 20% three times ( growth start , before blooming and just after berry setting) and ascorbic acid at 1000 ppm three times (growth start, just after berry setting and three weeks later) for promoting the yield. For improving quality of the berries, it is preferable to use N as 25% inorganic N plus spraying poultry manure tea at 40% and ascorbic acid at 2000 ppm. Application of such promised treatments surely reflected on saving 50 to 75% of the chemical N fertilizer and using poultry manure tea and ascorbic acid as substitutes for such inorganic N. This leads to enhance marketing of such cv to foreign markets.