الفهرس 
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Abstract
The present investigation was carried out during three successive seasons of 2010, 2011 and 2012. The work in the first year was considered as a preliminary trial. The experiment was conducted on 17 years old King Ruby grapevines planted on sandy soil under drip irrigation system at 2 × 3 meters in a private farm (El – Egeizy vineyard) located at El-Sadat district, Minufiya governorate, Egypt. The aim of this investigation was to study the effect of soil application of humic acid (at the rate of 0.0, 0.75, 1.5 and 3.0
g/vine) with or without bio-fertilizers (Serratia sp. + Bacillus polymyxa + Pseudomonas fluorescens + Trichoderma viride + Trichoderma harzianum) at 7.14 ml / vine and micro-elements (FeSO4.7H2O at 0.35 g + ZnSO4.7H2O at 0.18 g + MnSO4.H2O at 0.18 g) / vine on bud fertility, vegetative growth, mineral content of leaf petioles, yield, clusters and berries characteristics, canes diameter, pruning weight, total carbohydrates and total N in canes of King Ruby grapevines.
* This study revealed the following results :-
1-Results obtained in this study showed that adding humic acid at 1.5 and 3.0 g/vine with bio-fertilizers and micro-elements gave a significant increase of bud fertility, average leaf area and total chlorophyll content in the leaves when compared with without adding treatment in both seasons of study.
2-In general, it could be concluded that all significant values of N, P, K, Fe, Zn and Mn content in leaf petioles during the two seasons of study obtained from combinations of treatments of humic acid at 0.75, 1.5 and 3.0 g/vine with bio-fertilizers + micro-elements comparing with other treatments. Also, T12 (humic acid at 1.5 g/vine plus bio-fertilizers and micro-elements) and T16 (humic acid at 3.0 g/vine plus bio-fertilizers and micro-elements) gave the highest values in that respect in both seasons of study, while the lowest values were recorded by T1 (water only).
3-Results showed that adding humic acid at 1.5 and 3.0 g/vine with bio-fertilizers and micro-elements gave a significant increase of yield/vine, cluster weight & volume, berry firmness and adherence strength comparing with decreasing rate of humic acid (0.0 and 0.75 g/vine) with or without bio-fertilizers and micro-elements in both seasons of study.
4-The concerned results indicated that both T16 and T12 caused an obvious increase in most cluster and berry characteristics. Otherwise, those treatments recorded the lowest values for total acidity content in berry juice and nitrate & nitrite content in berries. Also, they recorded the highest values of canes diameter, pruning weight, total carbohydrates and total nitrogen in canes during the two seasons of study.