Document Type : Original Article
Authors
1
viticulture dept., Hort. res. Inst., ARC
2
Viticulture Research Department, Horticulture Research Institute, Agricultural Research Center, Giza, Egypt
3
Water Requirements and Field Irrigation Research Department, Soils, Water and Environment Research Institute, Agricultural Research Center, Giza, Egypt
4
Pomology Department, Faculty of Agriculture, Mansoura University, Egypt
Abstract
The present investigation were conducted over two consecutive seasons (2020 and 2021) in a private vineyard located at El-Sadat Region, Menoufiya Governorate, Egypt on ‘Early Sweet’ grapevines. Two field experiments were carried out, the first to assess the impact of superabsorbent polymer (SAP) on soil hydraulic properties. The second experiment to assess the effect of SAP on the growth, quality, yield, and water use efficiency of ‘Early Sweet’ grapevines under different levels of irrigation water, where the soil was treated with 900, 600, 300, or 0 g SAP/vine/season, and different levels of irrigation (100%, 80%, and 60% ETc). The results of the first experiment showed an improvement in the hydraulic properties of the soil, which increased with increasing SAP doses, which can reduce the amount of irrigation water. The results of the second experiment revealed that the percentage of bud burst was increased gradually by decreasing irrigation water level and increasing SAP doses. As for bud fruitful, 80% ETc recorded the highest values using the application of 900 and 600 g SAP doses. Moreover, the application of 900g SAP under 80% ETc gave the highest values of growth parameters (shoot length, leaves number/shoot, total leaf surface area/vine, coefficient of wood ripening, chlorophyll content and leaf mineral constituents). Furthermore, the results showed that the physical and chemical characteristics of berries and clusters were increased by increasing SAP doses under 80% ETc. Concerning the yield and water use efficiency, the application of 900g SAP under 80% ETc gave the highest significant values.
Keywords
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