Growth, fruitfulness and yield in relation to mycorrhizal inoculants in Thompson Seedless grapes (Vitis vinifera L.) grafted on Dog Ridge rootstock

The experiment was conducted during the year 2009–11 to study the response of Thompson Seedless grapevines (Vitis vinifera L.) grafted on Dog Ridge rootstock to varying levels of mycorrhizal root treatment (0.25 g/lit, 0.50 g/lit, 0.75 g/lit and 1.00 g/lit) at the farm of National Research Centre for Grapes, Pune. The treatment with mycorrhizal roots brought about considerable increase in the vegetative growth, yield/vine, biochemical changes in the shoots and microbial load in soil. Among the various treatments, the best results were obtained in 0.75 g/lit of mycorrhizal treatment. Application of mycorrhiza to the vine helped to increase nutrient uptake in shoots. The increase in nutrient assimilation resulted in better growth of the vines which enhanced the quality of fruit and yield/vine. The use of mycorrhizal inoculants resulted in increased growth, fruitfulness and yield in Thompson Seedless grapes as compared to the control treatment.