Paulo Roberto Grolli

Enraizamento de estacas de Chamaecyparis lawsoniana Parl. em cinco substratos com uso de ácido indolbutírico

To determine the best medium available in Pelotas, RS, for rooting of Chamaecyparis lawsoniana Parl. cuttings, the media fine vermiculite, carbonized rice hull, sand, carbonized rice hull + fine vermiculite and sand + fine vermiculite (1:1 v/v) were used. This experiment was carried out in a glass greenhouse with intermitent mist at the Plant Science Department of Faculdade de Agronomia Eliseu Maciel/Universidade Federal de Pelotas, from May to September 1997. Apical cuttings 15cm long were treated with indolbutyric acid (IBA) at 10.000ppm. The following evaluations were made: number of roots per cutting, weight of root dry matter, length of the longest root per cutting, and rooted cutting percentage. The results show that the vermiculite medium, with the IBA concentration utilized, is the most suitable for the rooting of C. lawsoniana cuttings, with 99% of rooting, greater number of roots per cutting (15), greater length of roots (12cm) and greater weight of root dry matter (0.04g).