الفهرس 
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Abstract
This experiment was conducted during two consecutive seasons of 2020 and 2021on: grapevine “Red Roomy” cultivar grown in the experimental orchard of fruit section, Faculty of Agriculture, Assiut University, where the soil is clay. The vines were 12 years old, and were planted at 2x2.5 m apart. Twenty four standardized grapevines from the cultivar were selected and devoted to achieve this study. “Red Roomy” cultivars was pruned as a traditional head training system with 15 fruiting spurs X 3 buds plus 5 replacements spurs X 2 buds/vine, Thus, the total buds left on each vine were 55 buds. Vines subjected to six treatments, each treatment was four times replicated .The following treatments has been carried out on each vine:
T1- 100% soil application from the recommended dose of potassium RDK (125 g K2O/vine via potassium sulphate, (check treatment)
T2- 50 % soil application RDK + spray with 4000 ppm Hanfu humate.
T3- 50 % soil application RDK + spray with 4000 ppm Delta Sol standard
T4- 50 % soil application RDK + spray with 750 ppm Nano-K2SO4
T5- 50 % soil application RDK + spray with 4000 ppm Potassium silicate
T6- 50 % soil application RDK + spray with 4000 ppm Novastroka
Potassium sulfate (48 % K2O) was added as a soil application at the rate of 100% (125 g K2O /vine) and 50% (62.5 g K2O /vine) at three equal doses, while Hanfu humate, Delta Sol standard, Potassium silicate, Novastroka and Nano-K fertilizer was applied as a foliar application. Hanfu humate was Hanfu humate (12% K2O), Delta Sol standard (12/0/45) NPK was (12% N+40% potassium nitrate +5% potassium acetate, potassium silicate was (10% K2O +25% silicon oxide) , Novastroka is (37% potassium citrate+13% magnesium) and Nano- potassium sulphate fertilizer was produced by Nano Lab, Faculty of Science, Assiut University. These treatments were applied at 3 stages, at the beginning of vegetative growth, after fruit set stage and at the véraison stage.
The following parameters were measured on each vine during the two studied seasons:
A-Vegetative growth Parameters:
1- leaf area (cm2)
2- Leaf chlorophyll content
3- Leaf potassium
4- Weight of one-year old pruning wood.
B-Yield components:
1- 1-Berry set percentage
2- 2-Yield weight (kg/vine)
3- 3-Cluster weight (g.)
C-1- Cluster characteristics:
1- Cluster length.
2- Berries number / cluster.
3- Cluster compactness coefficient (%)
4- Weight and volume of 100 berries
C-2- Berries properties:
1- Total soluble solids percentage (TSS %):
2- Titratable acidity percentage (T.A%):
3- Reducing sugars (%):
4- Total anthocyanin (mg/g).
The experiment was setup as a randomized complete block design (RCBD) with four replications for each treatment and one vine per each. All the obtained data were tabulated and analyzed according to (Gomez & Gomez, 1984 and Snedecor & Cochran, 1989) using L.S.D. test at 5% level of the probability for distinguishing the significance differences between various treatment means according to Steel and Torrie (1980).
The nearly same obtained data during the two seasons could be summarized under the following main topics
1-Effect of different sources of potassium on some vegetative growth traits
Data showed the effect of potassium soil application (100% RDK) and partially 50% of it, plus five foliar fertilizers sources namely Hanfu humate, Delta sol standard, Nano-K, Potassium Silicate and Novastroka on leaf area, total chlorophyll, pruning wood weight and Leave K % of Red Roomy grapevines during 2020 and 2021 seasons. Data revealed that these vegetative growth traits varied significantly according to different studied treatments and the data took similar trend during the two studied seasons.
The maximum values were measured on vines that treated with 50 % RDK + 4000 ppm Novastroka (T6) (123.23cm2, 46.33% 843.30g and 0.56%) as an average of two studied seasons followed by treated vine with 50 % RDK + 4000 ppm Delta sol standard (T3) (117.67cm2 47.87% & 813.78g and 0.56%) as an average of two studied seasons for leaf surface area, chlorophyll content, pruning wood weight and Leaf K % respectively. Furthermore, the minimum values of these traits were recorded on treated with 50 % RDK + 4000 ppm Hanfu humate (T2) (95.68 cm2, 40.64%, 567.89g and 0.34%) as an average of two studied seasons, respectively.
In general view, data indicated that 50% potassium soil application plus foliar fertilizers sources namely Delta sol standard, Potassium Silicate and Novastroka significantly increase vegetative growth traits compared to 100% potassium soil application (check treatment). On other hand, the Hanfu humate (T2) and Nano-K (T4) show negative effect on such studied traits.
2-Effect of different sources of potassium on some yield components
The results indicated that cluster weights and yield/vine were significantly affected by all potassium applications in both seasons. The results showed that the treatments effect on cluster weight and yield/vine took the same direction. In other words, the response of yield components to studied treatments taken the same trend.
The maximum values were measured on vines that treated with 50 % RDK + 4000 ppm Novastroka (T6) (411.44g, 14.03kg, and 18.95) as an average of two studied seasons followed by treated with 50 % RDK + 4000 ppm Delta sol standard (T3) (403.21g, 13.69 kg, and 18.81) as an average of two studied seasons for cluster weights yield/vine and berry set% respectively. Furthermore, the minimum values of these traits were recorded on treated with 50 % RDK + 4000 ppm Hanfu humate (T2) (336.42g, 11.65kg and 16.12) as an average of two studied seasons, respectively
3-Effect of different sources of potassium on some cluster traits
It is evident from the obtained data that the highest values of cluster length (19.81 and 19.71 cm), cluster width (16.93 and 16.87cm) and berries number/cluster was (109.64 and 109.64) , as an average of two studied seasons were recorded due to treating vines with 50 % RDK + 4000 ppm Novastroka (T6) and 50 % RDK + 4000 ppm Delta sol standard (T3). On the other side, the least values cluster length (17.09 cm) and cluster width (14.69 cm), as an average of two studied seasons were recorded due to treating vines with 50 % RDK +4000 ppm Hanfu humate (T2).
Moreover, the maximum values were measured on vines that treated with 50 % RDK + 4000 ppm Novastroka (T6) (375.7 g, 375.5 cm3 and 18.95%) as an average of two studied seasons followed by treated with 50 % RDK + 4000 ppm Delta sol standard (T3) (376.9 g, 376.4 cm3 and 18.8%) as an average of two studied seasons for weight of 100 berries (g), volume of 100 berries (cm3) and berry set% respectively. Furthermore, the minimum values of these traits were recorded on treated with 50 % RDK + 4000 ppm Hanfu humate (T2) (345.0g , 344.8 cm3 and 16.12%) as an average of two studied seasons, respectively.
4-Effect of different sources of potassium on some juice chemical properties
Data showed the effect of potassium soil application (100% RDK) and partially 50% of it, plus five foliar fertilizers sources namely Hanfu humate, Delta sol, Nano-K, Potassium Silicate and Novastroka on total soluble solids, titratable acidity, TSS/acid ratio reducing sugar % and anthocyanin contents of Red Roomy grapevines during 2020 and 2021. Data revealed that these Juice chemical properties varied significantly according to different studied treatments and the data took similar trend during the two studied seasons.
The maximum values were measured on vines that treated with 50 % RDK + 4000 ppm Novastroka (T6) was (17.87%, 16.09% and 2.99mg/g) as an average of two studied seasons followed by treated with 50 % RDK + 4000 ppm Delta sol standard (T3) was (18.19%, 16.19% and 2.98mg/g) as an average of two studied seasons for total soluble solids, reducing sugar and anthocyanin contents, respectively. On contrarily, the least values of these traits were recorded on vines treated with 50 % RDK + 4000 ppm Hanfu humate (T2) (16.03%, 14.59% and 2.16mg/g) as an average of two studied seasons, respectively.
On the other hand, the highest value of total acidity (0.38 and 0.38 %) as an average of two studied seasons was recorded on the vines that sprayed with 50 % RDK + 4000 ppm Hanfu humate (T2) and check treatment (T1) as an average of two studied seasons, respectively.
Conclusion
Under the conditions of this investigation, it could be concluded that applied vines with 50 % RDK + 4000 ppm Novastroka or with 50 % RDK + 4000 ppm Delta sol standard three times annually (at the beginning of vegetative growth, after fruit set stage and at the véraison stage) was necessary for ensuring the best vegetative growth traits, enhancing vine nutrition status, increasing yield components and improving fruit quality attributes as well as reduce the production costs and environmental pollution resulting from the increased use of mineral fertilizers of Red Roomy grapevines under Assiut conditions, Egypt