Substratos e concentrações de AIB na propagação de Juniperus chinensis var. kaizuka por estaquia

Abstract

The species of Juniperus chinensis var. kaizuka, has great ornamental value, but presents some difficulties and disadvantages regarding the use of seeds for its propagation Vegetative propagation appears as a promising alternative for the propagation of the species. The present work aimed to evaluate the propagation of Juniperus chinensis var. kaizuka by cuttings using different concentrations of indolebutyric acid and substrate. Two experiments were carried out at different collection times in different months. The experimental design used was completely randomized (DIC), in a 4 x 4 factorial scheme (substrate x IBA concentration), with four replications of 20 cuttings per experimental unit. Were tested as substrates, the commercial Mecplant, red oxisol mixture between commercial substrate and red oxisol in the ratio 1:1 (v/v) and mixture of these same substrates in the ratio 2:1 (v/v). The indole-butyric acid (IBA) concentrations were 0 mg L-1 (control), 2000 mg L-1, 4000 mg L-1 and 6000 mg L-1. The cuttings collected were from herbaceous branches from the apical region, in which they were made in the size of 8 cm, keeping a third of the leaves, having their base cut in a bevel. After 28 days of implementation of the experiment 1, the percentage of survival was evaluated. At 90 days in experiment 2, the percentages of rooting, survival and callogenesis, number and average length of adventitious roots per cutting, number and length of primary shoots were evaluated. It was concluded that the propagation of Juniperus chinensis var. kaizuka, through cuttings measuring 8 cm, in a low tunnel bed structure, did not show rooting potential under the tested conditions.