Productivity of ministumps and rooting of minicuttings of hybrids of Eucalyptus globulus labill in response to nitrogen/Produtividade de minicepas e enraizamento de miniestacas de hibridos de Eucalyptus globulus labill. Em resposta a nitrogenio

• Published in: Ciência florestal 2017-01, Vol.27 (1), p.193
• Main Authors: de Freitas, Alex Ferreira, de Paiva, Haroldo Nogueira, Xavier, Aloisio, Neves, Julio Cesar Lima
• Format: Article
• Language: Spanish
• ISSN: 1980-5098

The aim of this study was to evaluate the productivity of ministumps and the rooting of minicuttings from hybrid clones of Eucalyptus globulus in response to nitrogen concentrations in nutritive solution, in a fertirrigation system. To do so, we used five clones, namely: two of Eucalyptus urophylla x Eucalyptus globulus (C-04 and C-16); two of Eucalyptus grandis x Eucalyptus globulus (C-26 and C-30) and one of Eucalyptus urophylla x Eucalyptus grandis (1213) as a comparator. Five N concentrations were tested (36, 72, 109, 164 and 218 mg [L.sup.-1]) in a statistical design ofrandomized blocks on a split plot arrangement with three replications. Six months after the implementation, using standard nutritive solution, in fertirrigation system, the treatment application began. After 30 days, it began the weekly harvest of minicuttings and the cutting plantion at every 15 days, during 90 days. It was evaluated the survival and the productivity of the ministumps and, regarding the minicuttings, it was observed: the survival, the rooting percentage, the minicutting percentage with visible roots at the lower end of the tube, having these 10cm, after 30 days in the greenhouse. It was found that there is a significant effect of N concentration over the monthly productivity of ministumps from clones C-16 (169.05 mg [L.sup.-1]), C-26 (146.67 mg [L.sup.-1]) and for C-04 and 1213, (positive linear effect). However, no significant effect of dose was observed for the percentage of visible roots at the lower end of the tube, rooting and survival of cuttings at thirty days in the greenhouse. Keywords: clonal minigarden; mineral nutrition; vegetative propagation. O objetivo deste trabalho foi avaliar a produtividade de minicepas e o enraizamento de miniestacas de clones hibridos de Eucalyptus globulus em resposta a concentracoes de nitrogenio em fertirrigacao de minijardim clonal. Para isso, utilizaram-se cinco clones, sendo: dois clones de Eucalyptus urophylla x Eucalyptus globulus (C-04 e C-16); dois clones de Eucalyptus grandis x Eucalyptus globulus (C-26 e C-30) e um clone de Eucalyptus urophylla x Eucalyptus grandis (1213) como referencia. Foram testadas cinco concentracoes de N (36, 72, 109, 164 e 218 mg [L.sup.-1]) no arranjo de parcelas subdivididas com tres repeticoes, em delineamento estatistico de blocos ao acaso. Seis meses apos a implantacao do minijardim, utilizando solucao nutritiva padrao, em sistema de fertirrigacao, aplicaram-se os tratamentos por 30 dias, q