ROOTS OF MINI-CUTTING OF CLONES OF Sequoia sempervirens IN DIFFERENT SEASONS OF THE YEAR

Abstract

In this work, we analyzed the rooting of sequoia tree mini-cutting of different clones in the four seasons of the year and to use the logistic model to estimate the time of maximization of rooting in each factor of analysis. Mini-cutting of five clones grown in clonal minigarden were place to root in minitunnel in the four seasons. Weekly evaluations (from 30 to 93 days) of the variables: survival (%), rooted cuttings (%) and number of roots emitted were perform. These data was use to adjust the original logistic function. The design was completely randomized, in a 5 x 4 factorial scheme using 5 replicates of 50 mini-cuttings per experimental unit. During the winter the lowest rooting of mini-cuttings was obtain (85%), with rates higher than 90% in other seasons. In winter, slower rooting was also occur, observed around 60-70 days, while in other seasons it was between 50-60 days after mini-cutting. The rooting process is dependent on the clones, with four clones having roots greater than 90% and one (A133) less than 70%. In general, mini-cutting can was perform at any time of the year, recommending the period of 90 days of stay in minitunnel.