Quality and Yield of Table Grapes cv. "Early Sweet" as Affected by Humic Acid and Nano Calcium Carbonate

This investigation was conducted in a private farm located at Khatatba, Monofaia Governorate, Egypt during two successive seasons (2018 and 2019) to study the effect of humic acid and nano calcium carbonate treatments on quality and yield of "Early sweet" table grapes using factorial randomized complete block design with three replicates for each treatment. Humic acid was added as a soil application at rats of control, 2.5, 5 and 7.5 g/tree, while, nano calcium carbonate (0.5%) applied as a foliar application (control, once; two weeks after fruit setting and twice; two and four weeks after fruit setting). Results showed that humic acid (at 7.5 g/tree) and nano calcium carbonate foliar application (two times at two and four weeks after fruit setting) recorded the best values of cluster weight, number of clusters/tree, yield/tree, physical characters, i.e. cluster length, cluster width, juice of 100 berry and fruit firmness, and chemical composition, i.e. TSS, TSS/acidity, vitamin C content and carbohydrates percentage as compared with the control treatment which recorded the minimum values of these characters during both seasons.

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