Micro-nutrients content in petiole and leaf lamina as affected by applied nitrogen in grape (Vitis vinifera L) cv. Perlette

摘要

Micronutrient contributes a meager proportion of total mineral content in the leaves; but their presence is necessary for certain enzymes and enzymatic activities leading to various physiological activities in grapevines. The micro-nutrient (Fe, Cu, Mn and Zn) contents in petiole and leaf lamina of Perlette grapevines as affected by graded doses of N was significant. Iron, Cu and Zn concentration was found maximum at N_(500) level in both petiole and leaf lamina. This effect is attributed to the absorption of good amount of these nutrients from the soil. Further increase in N dose beyond N_(500) did not improve the concentration significantly but there was a slight decrease in concentration of these micro-nutrients might have occurred due to dilution effect on account of increased dry matter production. Mn content with varying level of N did not exhibit any definite trend.