Effect of seed coat removal and controlled-release fertilizer application on plant emergence and vegetative growth of two citrus rootstocks

Abstract

Effect of seed coat removal and controlled-release fertilizer application on plant emergence and vegetative growth of two citrus rootstocks.Abstract --Introduction. The technology for citrus rootstock production through improved sowing methods and fertilizer inputs offers greater opportunity in the certified citrus plant production system. Our work evaluated the influence of seed coat removal and different controlled-release fertilizer concentrations on plant emergence and plant growth of two citrus rootstock cultivars. Materials and methods. Decoated and not decoated seeds of Rangpur lime (Citrus limonia Osbeck) and Swingle citrumelo [Citrus paradisi × Poncirus trifoliata (L.) Raf] were sown in 50-cm 3 tubes. Fertilizer concentrations were (0, 1, 2, 3, 4 and 5) kg·m -3 of controlled-release fertilizer (NPK 19-06-10) incorporated into the substrate. The experimental layout followed a randomized block design with 2 × 6 factorial (seed coat removal × fertilizer concentration) for each rootstock. Results and discussion. Seed coat removal resulted in faster plant emergence and higher dry weight for both rootstocks. Vegetative growth increased with controlled-release fertilizer concentrations. ) incorporés au substrat. Le dispositif expé-rimental adopté a été celui de blocs randomisés à 2 × 6 facteur (décortiquage ou non de la graine × six concentrations d'engrais) pour chacun des deux porte-greffes étudiés. Résultats et discussion. Le décorticage de la graine a entrainé une levée plus rapide et un poids sec de la plantule amélioré pour les deux porte-greffes. La croissance végétative a augmenté avec les concentrations croissantes d'engrais.Brésil / Citrus / porte greffe / multiplication des plantes / graine / décorticage / fertilisation / levée / croissance

Nursery Growth of Citrus Rootstocks With Root Malformation

“…The rapid growth of the stem of 'Volkamerian' Lemon has been reported by Girardi et al (2007), who affirm that it is a vigorous rootstock, in nursery. 'Volkamerian' Lemon also had greater stem diameter, indicating that the two 'Carrizo' fue de 1.46 y 1.39, respectivamente (Cuadro 3).…”

“…El rápido crecimiento del tallo de Limón 'Volkameriano' ha sido señalado por Girardi et al (2007). quienes afirman que es un portainjerto vigoroso en vivero.…”

“…Root growth is defined by the volume of soil explored by the plant to obtain water and nutrients (Hsiao, 2000;Pérez-Pérez et al, 2008). Root malformation may cause imbalance to shoot/root ratio and affects the growth of the trees.…”

“…El crecimiento de la raíz está definido por el volumen de suelo que la planta explora para la obtención de agua y nutrimentos (Hsiao, 2000;Pérez-Pérez et al, 2008). La malformación de raíz puede provocar desequilibrio para parte aérea/raíz y afectar el desarrollo de los árboles.…”

Desenvolvimento vegetativo e custo de produção de porta-enxertos de citros em recipientes para fins de subenxertia

“…As sementes foram extraídas manualmente, submetidas a secagem à sombra por 24 horas e, posteriormente, embaladas em jornal, com aplicação de fungicida apropriado. As sementes foram mantidas em refrigerador a 5°C até a semeadura, em novembro de 2003, quando, então, se extraiu seu tegumento externo (testa), a fim de acelerar a emergência e, portanto, auxiliar na otimização da produção dos subenxertos (Girardi et al, 2007).…”