Efeito da aplicação foliar de diferentes fontes de silício nos frutos da videira

Abstract

In the search for productivity and fruit quality in the vine culture, the use of different sources of silicon has been gaining prominence. The objective of this work was to evaluate the effect of foliar application of three sources of silicon on fruit characteristics in grapevine. The experiment was carried out in the field, in an orchard of the cultivar Niágara Rosada, in the municipality of Farroupilha, RS, in randomized blocks and in a 4x2 factorial scheme, with a control (T1) and 3 commercial products containing silicon: (T2) Potassium silicate and iron (T3) Potassium silicate and Magnesium silicate. The treatments were associated with chemical control with fungicides in four distinct phenological phases in the culture, in the dosages recommended by the manufacturers and standardized for the same silicon concentration, aiming at the addition of 40 g. ha-1 of silicon. The treatments were applied with a spray volume of 2 l. ha-1 for every 36m² of usable area of each plot. The analyzed variables were: bunch characteristics (average mass, length, number of berries); characteristics of the berries (weight and diameter) and chemical characterization of the grapes (°Brix). The foliar application of magnesium silicate in the crop provided significant increases for two variables analyzed in relation to the control treatment: bunch weight and number of berries per bunch. However, no significant differences were observed between the bunch length, berry diameter and ºBrix treatments. Thus, under the conditions tested, the use of magnesium silicate benefits the vine culture, providing greater productive potential. [resumo fornecido pelo autor]