Effect of different substrates and auxins on rooting of Leucadendron sp. (Proteaceae)

Colombian flower growers are faced with economic and social problems, so they are looking for alternatives, which include Proteas, ornamentals that require research that en-sures an appropriate, local technical management. One of the Proteas most likely to be involved in this search is the ge-nus Leucadendron. Therefore, this study aimed to establish the best basis for rooting its cuttings. The experimental de-sign was a split plot design with a factorial arrangement. Four substrates were evaluated in combination with two auxins, naphthaleneacetic acid (NAA) and indolebutiric acid (IBA), three doses each, plus a commercial control. Each treatment was repeated three times and the experimental unit consisted of 30 stakes at the first locality and 25 at the second one. The most relevant results showed that vermiculite was the best substrate for rooting cuttings of Leucadendron at both local-ities. Also, it was identified that IBA is the growth regulator which improved the rooting percentage, the root volume, the stem decreased the percentage of losses.