Propagação vegetativa de louro-pardo (Cordia trichotoma Vell.) por estaquia

Abstract

With great potential in commercial plantations, the black-parrot is one of the most promising native species for the South, Center-West and Southeast regions of Brazil, presenting rapid growth, good shape, excellent quality wood and vigorous natural regeneration. However, the stalemate is to obtain seedlings of genetic and physiological quality. With recalcitrant seeds and low vigor, vegetative propagation appears as an alternative, but presents limitations for the species. In order to vegetatively propagate the black-parrot, the work aimed to test the use of cuttings, varying the size of the cuttings, concentration and application of IBA and substrate. The works were carried out at the Universidade Tecnológica Federal do Paraná - Câmpus Dois Vizinhos and at the rural property located in the municipality of Toledo. In the first experiment, herbaceous cuttings and semilenous cuttings, both 12 cm long, were used. Variations of indole-3-butyric acid (AIB) at concentrations of 0, 4000 and 8000 mg L-¹ were tested. The substrate used was of commercial type Plantmax®, in black containers with Tetra Park® milk carton and plastic trays. The experimental design was a randomized block design with factorial arrangement 3x2x2 (concentrations of IBA x type of stake x recipient - type of recepient), with four replicates of 10 stakes as experimental unit. For the second experiment, semilenous cuttings with 8 cm in length were used, varying the IBA solution at concentrations of 0; 1000 and 2000 mg L-1, and using commercial Plantmax® substrate for polystyrene and latosol container. The experimental design was a randomized block design with 3x2 factorial arrangement (AIB x container - plat and styrofoam with substrate), with 4 replicates of 20 cuttings as experimental unit. The third experiment evaluated the effect of the environment - greenhouse and estufim and the application of AIB in the concentrations of 0; 8000 mg L-¹; 8000 mg L-¹ with repetition after 15 days and 8000 mg L-¹ with cotton at its base, for 60 seconds on semi-shallow stakes 12cm in length. The experimental design was a randomized complete block design with 4x2 factorial arrangement (AIB x local - greenhouse and estufim), with 4 replicates of 20 stakes as experimental unit. The techniques used in each experiment did not provide rhizogenesis of the branches of black-parrot.