Print version ISSN 0103-9016
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.