This study aimed to verify the development and the nutritional status of Mentha spicata x suaveolens cultivated under different Ca2+ levels in nutrient solution with application of plant growth regulators. The experiment was in factorial design (4X4) with four Ca2+ levels in the nutrient solution (160, 120, 80 and 40 mg L-1) and three leaf applications, at 15-day intervals, of naphthalene acetic acid (NAA), gibberellic acid (GA3), benzyladenine (BA) and distilled water as control. Plants were harvested at 60 days after transferring to the nutrient solution and the following variables were evaluated fresh and dried matter, leaf area, number of leaves, volume, length and surface of roots, and leaf content of Ca, K, Mg, N and P. The variables were subjected to analysis of variance and means compared by Tukey's test. There were no differences between Ca levels for biomass production. The auxin did not influence the dry matter of plants although it increased the leaf content of Ca2+, the cytokinin reduced total dry matter and the gibberellin increased the stem dry matter. The change in Ca2+ did not influence the leaf content of N, P, K and Mg. There was response for the application of Ca2+, reaching the maximum of 15.73 mg L-1 leaf content at the level of 137.81 mg L-1, according to regression analysis.
mint; auxin; gibberellin; cytokinin; medicinal plants
