الفهرس 
INTRODUCTION
The effect of Boron, Zinc and NAA on fruit set, yield and quality of grapeOnly 14 pages are availabe for public view
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Abstract
Experiments were carried out throughout two successive seasons of 2014 and 2015 on Red Roomy and Thompson Seedless grapevines grown at the Experimental Orchard of Assiut University, Faculty of Agriculture. The grapevines ages were 12 years old at the beginning of the experiment and they were planted at 2x2.5 m apart. Forty-five uniform grapevines from Red Roomy and twenty-eight grapevines from Thompson Seedless were chosen. All grapevines were pruned as the traditional had training system with 20 fruit spurs and 4 buds were left on each spur for Red Roomy and 5 buds for Thompson Seedless.
1) The first experiment: This experiment was conducted during two successive years of 2014 and 2015 on forty five (45) Red Roomy grapevines and aimed to overcome the looseness of berries as well as improving the yield and berry quality of Red Roomy grape cultivar by using Boron, Zinc and NAA, The treatment categories were:
1-Spraying with NAA at 2.5 ppm.
2-Spraying with NAA at 5 ppm.
3-Spraying with Boron at 20 ppm.
4-Spraying with Boron at 40 ppm.
5-Spraying with Zinc at 100 ppm.
6-Spraying with Zinc at 200 ppm.
7-Spraying with Boron at 20 ppm + Zinc at 100 ppm.
8-Spraying with Boron at 40 ppm + Zinc at 200 ppm.
9-Control – spraying with water. The obtained results can be summarized as following:
1 - The treatments significantly increased the IFS with an exception of Boron at 20 ppm and Boron 40 ppm + Zinc 200 ppm. The most effective treatment in this respect was spraying with Zinc at 100 ppm followed by Boron at 40 ppm and then Boron at 20 ppm + Zinc at 100 ppm.
2 - Berry DROP percentage was very high in the control as compared with the treatments. All the treatments showed high significant differences comparing with the control. The treatment Boron at 20 ppm exhibited the lowest berry DROP percentage during the two studied seasons While, Boron at 20 ppm + Zinc at 100 ppm was the 2nd effective treatment in this respect followed by Zinc at 100 ppm.
3 - The cluster numbers not significantly affected by various treatments. However, spraying the vines with zinc at 100 ppm produced the highest yield(kg/vine) followed by boron at 20 ppm + zinc at 100 ppm along with Boron at 40 ppm. The rest of treatments, although they increased the yield over the control but the differences with the control were not significant. The control vines gave the lowest yield among all the treatments.
4 - The presented data showed that there were no significant differences between treatments on the cluster width. On the other hand, treatments exhibited significant differences comparing with the control in respect of the cluster height.
5 - The treatments except of spraying with NAA had significant differences comparing with the control in respect of the cluster weight. However, the control vines gave the lowest cluster weight during the two studied seasons On the contrary; the control gave the highest weight of 100 berries. On the other hand, although the control produced the highest juice weight of 100 berries but the differences were not significant during the two seasons of study.