Correlação entre a produtividade e os resultados de análise foliar e de solo em vinhedos de Niagara Rosada

Abstract

An experiment was carried out at Jundiaí and Louveira–SP, to verify the relationships between nutritional and productivity aspects of the table grapevine cv. Niagara Rosada grafted on two different rootstocks: IAC 766 (20 vineyards) and 'Ripária do Traviú' (20 vineyards). Soil samples were collected at 0–20 and 20–40cm depths within rows and inter–rows; samples of leaves, leaf blades and petioles were collected at full bloom and veraison, aiming to correlate them with productivity data. It was observed for the rootstock IAC 766 significant correlations between productivity and results of soil and leaf analysis. The low productivity verified was related to soil nutrients excess, mainly calcium and magnesium, due to the fact that liming and fertilization practices did not consider the soil analysis. The productivity was positively correlated with potassium amount in the soil, K/Mg ratio and potassium contents in the leaves; and it was negatively correlated with (Ca+Mg)/K ratio in the soil, and calcium and magnesium leaf contents, showing an antagonism between magnesium and potassium.