Bioregulators Stimulate® and Acadian® as growth stimulants for Mezilaurus itauba TAUB. EX MEZ seedlings
DOI:
https://doi.org/10.5433/1679-0359.2025v46n3p861Keywords:
Mezilaurus itauba, Seedling production, Ascophyllum nodosum, Stimulate®.Abstract
The use of plant bioregulators has proven effective in increasing the vigor of seedlings of various forest species, playing a fundamental role in stimulating their morphological and physiological development. This study aimed to evaluate the effect of bioregulators at different rates on the initial growth and quality of Mezilaurus itauba seedlings. The study was conducted in a greenhouse using seeds collected in Mucajaí-RR, Brazil. The experimental design was completely randomized, in a 2x4 factorial arrangement, with two plant growth regulators (Acadian® and Stimulate®) and four rates (0, 0.2, 0.4, and 0.6 ml L-1), with four replicates each. At 180 days, the following variables were evaluated: a) plant height (H), b) stem collar diameter (SD), c) height increase (HI), d) diameter increase (DI), e) shoot dry weight (SDW), f) root dry weight (RDW), g) total dry weight (TDW), and h) Dickson Quality Index (DQI). There was no interaction between rates and bioregulators. The bioregulator Stimulate® promoted greater development in HI, DI, SDW, RDW, TDW, and DQI compared to Acadian®. Regarding rates, greater development was observed for all variables at 0.35 ml L-1. The rate of maximum technical efficiency of Stimulate® for good initial development of Mezilaurus itauba seedlings is 0.35 ml L-1.
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