Abstract

ALBUQUERQUE, Teresinha Costa Silveira de  and  DECHEN, Antonio Roque. Macronutrient absorption by rootstocks and grapevine cultivars grown hidroponically. Sci. agric. [online]. 2000, vol.57, n.1, pp. 135-139. ISSN 0103-9016.  http://dx.doi.org/10.1590/S0103-90162000000100022.

The purpose of this study was to evaluate the macronutrient uptake capacity of some rootstocks used for the grape cultivars ‘Thompson Seedless’ and ‘Italia’. The rootstocks ‘Tropical‘ - IAC 313, ‘Jales‘ - IAC 572, ‘Campinas‘ - IAC 766, ‘Dog Ridge‘, ‘Salt Creek‘ and ‘Harmony‘, and the cultivars ‘Thompson Seedless’ and ‘Italia’ were propagated from two bud cuttings, in sand, until root development, being thereafter transplanted to 3L pots with a mixture 2:1 by volume of silica and sand. The young grapevines were pruned to uniformize their size. The growth solution was supplied by a drip irrigation , regulated with a timer. The pruning was made when the grapevine shoots reached 1.50m. The samples were dried and the macronutrients were analyzed. The results indicated that: the biomass yield shows high correlation with the nutrient level; ‘Jales‘ rootstock showed the highest dry matter yield in the aboveground part, being considered the most vigorous, followed by ‘Tropical‘ and ‘Campinas‘; the cultivars ‘Thompson Seedless‘ and ‘Italia‘ and the rootstocks ‘Harmony‘, ‘Dog Ridge‘ and ‘Salt Creek‘ showed the lowest dry matter yield, being considered less vigorous among all; ‘Jales‘ rootstock extracted the higest amount of N, P, K and Ca, and the same amount of Mg as the ‘Tropical‘ rootstock; in a general way, extraction of N, P, K, Ca and Mg by the cultivars ‘Thompson Seedles’ and ‘Italia’ was equivalent to that of the rootstocks ‘Campinas‘, ‘Harmony‘, ‘Dog Ridge‘ and ‘Salt Creek‘.

Keywords : Vitis sp.; uva apirena; porta-enxerto; nutrição mineral; Vitis sp.; seedless grapevines; rootstock; mineral nutrition.