Effect of graded doses of nitrogen on tissue nutrient status of grape

An experiment was conducted to find out the effect of five graded doses of N in petiole and leaf nutrient status on evenly pruned (60 canes/vine), bower trained eight-year-old Perlette vines spaced at a distance of 3 m × 3 m. The tissue N concentration increased with increased application of N to the soil up to N₅₀₀ level. The treatment N₅₀₀ resulted in the highest N and K concentration at full bloom and veraison stages of sampling both in petiole and leaf lamina. The increase in level of N resulted in decrease in P concentration after an initial increase (up to N₂₅₀) with lower doses in the tissue, of petiole and leaf lamina. A dose of 500g N per vine was found to be optimum for tissue nutrient status under present agroclimatic conditions.