Analysis of Productivity Indicators of Helwani and Zeni Grape Varieties (Vitis vinifera L.) as Affected by Foliar Spray with Different Concentrations of Humic Acid

Abstract

 This research was conducted in the village of Sejar, located in Idlib province, during the agricultural season 2022. This study aimed to investigate the productivity indicators of Helwani and Zeni grape varieties under the influence of foliar spray with two different concentrations of humic acid (5, 15 mL/L) and control (0 mL/L). A completely randomized design (CRD) was employed to distribute the experimental replications.

The results indicated that Helwani variety outperformed in several productivity indicators such as shoot length (146.3 cm), internode length (5.1 cm), number of internodes per shoot (27.7), bunch weight (469.7 g), bunch volume (456.7 cm³), number of berries per bunch (65.8), and pH (4.38). On the other hand, Zeni variety exhibited superiority interms of the number of bunches (72.1), berry weight (6 g), berry volume (5.75 cm³), 1000-seed weight (64.13 g), total productivity (24.3 kg/shrub), and TA (0.3%). Moreover, foliar spray with a concentration of 5 mL/L of humic acid showed significant superiority in the number of bunches (83), 1000- seed weight (61.5 g), and total productivity (31.9 kg/shrub) comparedto the other concentrations (0 and 15 mL/L). Additionally, a concentrationof 15 mL/L of humic acid exhibited significant superiority in TA (0.28%) compared to the other two concentrations (0 and 15 mL/L). The concentration of 15 mL/L also showed significant superiority in traits such as internode length (4.9 cm), bunch weight (455.8 g), bunch volume (345.1 cm³), number of berries (69.8), and berry volume (5.8 cm³) compared to the control (0 mL/L).

In terms of the interaction between experimental factors, spray Helwani variety with a concentration of 5 g/L of humic acid showed significant superiority in shoot length (165.3 cm), number of internodes per shoot (29.7), TSS (16.5%), and TS (14.8%). Similarly, spray the same variety with a concentration of 15 mL/L resulted in the highest values for internode length (5.6 cm), bunch weight (518.6 g), bunch volume (510.4 cm³), and number of berries per bunch (91). Furthermore, spray Zeni variety with a concentration of 5 mL/L of humic acid yielded the highest values in leaf area (87.6 cm²), number of bunches (103.7), 1000-seed weight (75.1 g), and total productivity (34.7 kg/shrub). Conversely, spray with a concentration of 15 mL/L exhibited the highest values for berry weight (6.4 g), berry volume (5.9 cm³), and TA (34%).