Four biofertilizers (active dry yeast, phosphorene, rhizobacterium, and nitrobein) were used to fertilize `Red Roomy' grapevines. Growth and nutritional status of the vines as affected by such fertilizers during 1995 and 1996 were studied. Results showed that fertilizing the vine with all biofertilizers caused a material improvement in shoot length, leaf area, and cane thickness, and effectively enhance the nutritional status of the vines. The favorable effects of such fertilizers were in the following descending order: phosphorene, rhizobacterium, nitrobein, and active dry yeast. A great increase on growth and nutritional status of `Red Roomy' grapevines occurred as a result of supplying the vines with phosphorene or rhizobacterium as good, new biofertilizers.

Six newly-introduced grape cultivars nemely Arra 30, Arra 29, Arra 13, Arra 24, Arra 27, and Arra 15, were investigated in three successive seasons ( 2014, 2015 & 2016) for description and evaluation under Egyptian conditions.The cultivars were grown in a private vineyard situated at Birqash region -Giza governorate, Egypt. Vines were planted in sandy soil spaced 3X2 meters apart and irrigated by drip irrigation system and supported by Gable system. The study included time of bud burst, young shoots, young leaves, shoot, and time of bloom, flower, mature leaf, beside determining time of ripening, Bunch, berry, Tss, Acidity, Tss / acid ratio, and seed formation.The studied cultivars were characterized by good vegetative growth and good fruit quality.

During 1995 and 1996, yield and quality of `Banaty' grapes in response to spraying chelated iron and zinc singly or in combination each at 0.025%, 0.05%, 0.1%, 0.2%, or 0.3% was investigated. Each concentration was applied once, twice, three, four, or five times. Results showed that there was a gradual increase in berry set, cluster number, yield, cluster weight, berry weight, total soluble solid sugars, and total anthocyanins with rising concentrations and number of sprays of each fertilizer. Total acidity tended to reduce with such treatment. Combined spray of both fertilizers, particularly at 0.1% four times, gave satisfactory improvement in both quantity and quality of grapes. Spraying at concentrations higher than 0.1% or spraying more than four times failed to show any measurable effect on all of the studied traits. The best results with regard to yield and quality of `Banaty' grapes were obtained on vines that received four sprays of iron and zinc each at 0.1% in chelated form.

The positive influence of fertilizing `Red Roomy' grapevines with four biofertilizers (active dry yeast, phosphorene, rhizobacterium, and nitrobein) on berry set and productivity was investigated during 1995 and 1996. The improvement occurred in berry set and yield, as well as physical and chemical properties in vines treated with the four biofertilizers in the following ascending order: active dry yeast, nitrobein, rhizobacterium, and phosphorene. Highly significant differences in characters were observed between treated and untreated vines. The best results with regard to yield and quality of berries was obtained in `Red Roomy' vines biofertilized with phosphorene or rhizobacterium.

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