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
-1) in a statistical design of randomized 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
-1), C-26 (146.67 mg L
-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.
