Crescimento inicial de miniestacas de erva-sal submetidas a diferentes concentrações de enraizadores sintéticos.

Abstract

Saltwort (Atriplex nummularia) is a forage native to Australia with great potential in animal feed, also standing out in the phytoremediation of saline-sodic soils in areas degraded and desalination in wells, due to their high salt absorption capacity. Among the obstacles to the advancement of the species is the low germination of seeds, with vegetative propagation an alternative. Aiming to make the production protocol more efficient of seedlings of this species, the objective was to evaluate the viability of rooting mini-cuttings of yerba-sal by applying different concentrations of indolebutyric acid (IBA) and acid acetic naphthalene (ANA). The experiment was conducted in the municipality of Picuí/PB. It was used 8 cm mini-cuttings, whose bases were immersed for 10 s in hydro-alcoholic solutions and acids were added, known as T1 – Control (Absence of acids), T2 – IBA 2%, T3 – ANA 0.4% and T4 – IBA + ANA 1%, then buried in substrate sand base. The experimental design was completely randomized with 4 treatments and 5 repetitions. At 60 days after planting, root length, number of leaves, fresh and dry phytomass of roots and aerial parts and percentage of rooted cuttings. The data were subjected to analysis of variance. There was no influence from regulators IBA and ANA for none of the rooting variables. A higher rooting rate was observed and average root length in the control; for leaf numbers, fresh phytomass and dry phytomass the most prominent results were T4. Under conditions in which the experiment was conducted, it can be concluded that Atriplex nummularia does not need the phytohormones for rooting, the different tested concentrations of isolated IBA and ANA, presented the lowest averages. In contrast, the combination of IBA + ANA 1% achieved the best performances in practically all variables.