Dry matter and nutrient accumulation in grafted pear seedlings in hydroponic system/Massa seca e acumulo de nutrientes em mudas enxertadas de pereira em sistema hidroponico

The production of grafted seedlings of pear and peach trees in hydroponics is recent and has been becoming a promising propagation method with a significant reduction in the seedling production time. This study was conducted in order to determine the dry matter of plant parts and the accumulation of macro and micronutrients by pear grafted seedlings in hydroponic conditions. It was used a completely randomized factorial scheme 3 x 3 with four replications was. Each replication was made up of two plants (one in each tube), amounting to 72 plants. The factors under study were: three cultivars (Triunfo, Tenra and Cascatense) and three sorts of grafting (bench grafting--BP, inverted T budding -BT and cleft grafting -GF). The nutrient accumulation in pear seedlings, regardless of the cultivar, settled in the following order for macronutrients: N>Mg>K>Ca>P>S; and micronutrients: Fe>Mn>B>Zn>Cu. Index terms: Pyrus sp., soilless growing system, vegetative propagation, cultivate. O trabalho objetivou determinar a producao de massa da materia seca das partes da planta e o acumulo total de macro e micronutrientes pelas mudas enxertadas de cultivares de pereira em condicoes hidroponicas. Utilizou-se do delineamento experimental inteiramente casualizado, em esquema fatorial 3 x 3, com quatro repeticoes. os fatores em estudo foram: tres cultivares (Triunfo, Tenra e Cascatense) e tres tipos de enxertia (borbulhia em placa--BP; borbulhia em 'T' invertido--BT, e garfagem de fenda cheia GF). Avaliaram-se a massa seca da parte area, do sistema radicular e total, e o acumulo total de nutrientes. o metodo de enxertia de garfagem de fenda cheia e as cultivares Tenra e Triunfo sao indicados para a producao de mudas de pereira em sistema hidroponico. No acumulo de nutrientes nas mudas de pereira, independentemente da cultivar, estabeleceu-se a seguinte ordem para macronutrientes: N>Mg>K>Ca>P>S; e para os micronutrientes: Fe>Mn>B>Zn>Cu. Termos para indexacao: Pyrus sp., sistema de cultivo sem solo, propagacao vegetativa, cultivares.