Efficacy of Ascophyllum nodosum Seaweed Extracts on Growth, Yield and Quality Parameters in Thompson Seedless Grapes

The experiment was conducted on Thompson Seedless grafted on Dogridge rootstock planted at ICAR- National Research Centre for Grapes, Pune during the year 2021-2022. The experiments was carried out in completely randomized block design. Standard cultural practices were followed during the experimentation. The A. nodosum was applied with different concentration varies from 0.25 kg/ha to 1.25 kg/ ha at 4-6 inch cane growth, 8-14 inch cane growth (14 days after 1st spray), 10 days after fruit set, 2 weeks after 3rd spray, 2 weeks after 4th spray and Version Stage. The result obtained from this study showed that the chlorophyll content index (44.30 µmol/m²), leaf area index (1.88 cm2), bunch weight (216.16 g), berry diameter (14.83 mm), berry length (19.81 mm), yield/ha (16.86 ton), TSS (21.050 Brix) and Acidity (0.66%) were recorded higher in treatment treated with A.nodosum @ 0.75kg/ha. From this study, it is concluded that foliar application of A. nodosum @ 0.75 kg/ha recorded higher chlorophyll content in leaf and chlorophyll content index also helpful for improving and increasing yield and quality parameters in Grapes.