Studies on nutrient composition in petioles of grapes under different vineyard groups and grape yield in Alfisols soils of Northern dry zone of Karnataka

A study was conducted to evaluate the nutrient status in different vineyards and its influence petiole nutrient contents and grape yields during 2019-2020 in Alfisols soils of Northern Dry Zone of Karnataka. Based on the previous year yield data, the thirty vineyards were classified into three groups namely, low yielding vineyards (LYV), medium yielding vineyards (MYV) and high yielding vineyards (HYV). The petiole nitrogen (1.41±0.21%), phosphorus (0.48±0.06%) and potassium (3.07±0.40%) contents were found significantly higher in HYV group followed by MYV and LYV. The petiole Ca and Mg contents were found non significant while, the sulphur content was found significantly higher (0.25±0.04%) in HYV. Petiole micronutrients namely, iron, manganese, zinc and copper in three different vineyard groups were found in the order Mn > Fe > Zn > Cu. The grape yield was recorded significantly higher (33.15±2.69 t ha^-1) in HYV group compared to MYV (26.25±1.02 t ha^-1) and LYV group (19.70±1.58 t ha^-1).