The 2011 ASHS Annual Conference

<i>Nerium oleander</i> L. is a woody and everlasting native shrub of the Mediterranean zone that is cultivated in the whole world as ornamental plant. It produces very showy inflorescences in the shape of corymbs terminals and it thinks that it is about 400 you will cultivate with a wide variety of colors. Of the different fitohormones, the indolacetic acid (IAA) is the compound that is in use with major frequency, for being directly involved in the process of taken root of stakes. The utilization of these hormones in the agriculture, has very diverse uses: in cultures, in nurseries and in the plantations, with the intention of increasing the percentage of taken root on having accelerated the radical initiation and having increased the number and quality of the roots of many ornamental species. The aim of this experiment was to evaluate the effect of IAA different concentrations in the taken root of cuttings of <i>N. oleander</i>   established  in  conditions  of  tunnel.  This  work  was  realized  in  the   nurcery "Colima's Select Plants", in Colima, Mexico. The process of taken root of the plants was in propagation plates of 50 cavities, with a mixture of fine dust of coconut 80 % and land of dam 20 %, for 30 days. The evaluated treatments were: 0, 3000, 4000, 5000, 6000, 7000, 8000, 9000 and 10000 ppm of IAA. The experimental design was completely at random, with 9 treatments and five repetitions; the experimental unit was formed by ten cuttings. The evaluated variables were the number of roots and leaves for cutting, as well as number of cuttings successfully. The results indicate that the best treatment after 30 days, was 10000 ppm with 90 % of alive cuttings; 9000 ppm had 80 % and from 8000 ppm ensued with 70 % of alive cuttings; the witness concluded with 40 %. Other treatments presented dehydration and progressive death of the cuttings.