Abstract
Plant growth regulators and biostimulants have been used as an agronomic technique to optimize the production of seedlings in various crops. This study aimed to evaluate the influence of gibberellic acid and the biostimulant Stimulate® on the initial growth of tamarind (Tamarindus indica L.). The experiments were conducted in a nursery with 50% shading, in a randomized block design with five replications and five plants per plot. Thirty eight days after sowing, the leaves were sprayed seven times a day with 0.0 (control), 0.8, 1.6, 2.4 and 3.2 mL of gibberellic acid L-1 aqueous solution and with 0.0 (control), 6.0,12.0, 18.0, and 24.0 mL Stimulate® L-1 aqueous solution. Stem diameter (SD), plant height (PH), longest root length (LRL), shoot dry mass (SDM), root dry mass (RDM) and RDM:SDM ratio were evaluated ninety days after sowing. Variance and regression analysis showed that GA3 at 4% promoted plant growth (height), but had no significant effect on stem diameter, longest root length, shoot and root dry mass and the RDM:SDM ratio. On the other hand, all concentrations of Stimulate® significantly increased plant height and shoot and root dry mass of tamarind seedlings.
Highlights
The tamarind (Tamarindus indica L.) belongs to the Dicotyledonous family Leguminosae native to Equatorial Africa, India and Southeast Asia
Experiment 1 – Gibberellic acid (GA3 at 4%) Gibberellic acid sprayed on tamarind seedlings had a positive effect on plant height (Table 1), but did not significantly affect the other traits analyzed
The positive effect of gibberellic acid on plant growth has been reported by several authors, especially when applied during the initial developmental stages (COELHO et al, 1983; MODESTO et al, 1996; LEITE et al, 2003; LEONEL; PEDROSO, 2005)
Summary
The tamarind (Tamarindus indica L.) belongs to the Dicotyledonous family Leguminosae native to Equatorial Africa, India and Southeast Asia. The tree provides wood, fruits, seeds, forage, medicinal compounds and has industrial potential. It can be grown commercially or used in agroforestry systems, but its growth is slow (PEREIRA et al, 2007). Souza et al (2007) studied the effect of different nitrogen and phosphorus concentrations on the production of tamarind seedlings, and Silva et al (2011) used chemical treatments to increase seed germination and initial growth rate, but their results were not satisfactory in terms of aerial part length The importance of research that aims to increase plant initial growth rate. Souza et al (2007) studied the effect of different nitrogen and phosphorus concentrations on the production of tamarind seedlings, and Silva et al (2011) used chemical treatments to increase seed germination and initial growth rate, but their results were not satisfactory in terms of aerial part length
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