Abstract
The paclobutrazol is a growth inhibitor used in ornamental species with bushy growth habits because of its broad spectrum of action, facilitating the obtaining of compact plants in a short time. Concentrations of 0.0, 50, 100, 200 and 400 ml·liter-1 of paclobutrazol were applied every two weeks on plants of Dahlia pinnata Cav. After seven applications, the concentration with the best response was 400 ml·liter-1, obtaining plants 45.30 cm tall, with short internodes, thicker stem, higher chlorophyll content, and more heavier voluminous tuberous roots than the control.
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