Influencia da idade da muda do tomateiro e da utilização de paclobutrazol e bioestimulantes
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2017-04-07
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Universidade Federal de Goiás
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The quality of the vegetable seedlings is a determining factor, and can directly affect the
production of any crop. In this way, the objective of this work was to evaluate the influence of the
age of seedlings and biostimulants on the performance of industrial tomato plants at different
stages of plant development. Two experiments were conducted in the Horticulture Sector of the
Universidade Federal de Goiás, Goiânia-GO, one in the field and another in a greenhouse, in both
pre and post-transplant trials. In the first, pre-transplant trials were performed in a completely
randomized design with four replicates. The treatments consisted of six seedling ages (20, 30, 40,
50, 60 and 70 DAS) and ten plants per replicate. The experimental design was a randomized
complete block design with four replications in a 2 x 6 factorial scheme [without and with the
application of Stimulate® and six seedlings ages (20, 30, 40, 50, 60 and 70 DAS) ]. The data were
submitted to analysis of variance by the F test at 5% probability. When the significant difference
was found, the regression analysis was performed. Seedlings with seventy days showed superior
results for height, number of leaves, diameter and dry mass of leaves and roots, but this was not
reflected in the production, and there was no significant difference between treatments in this
phase. There was no influence of the age of the seedlings and the use of Stimulate® on the
production parameters evaluated. In order to recommend the best seedling age, studies on the
financial viability of seedlings at each age are required. In the second experiment, pre-transplant
evaluations were performed in a completely randomized design with four replicates. The
treatments consisted of two types of seedlings, without and with paclobutrazol and three plants per
replicate. The data were submitted to analysis of variance by the F test at 5% probability. The
treatments consisted of two types of seedlings - without and with growth regulator (paclobutrazol)
and seven biostimulants (Stimulate, Serenade, EnerVig, Px-Fertile, Vorax, Liqui-plex, Duo Organ
+) plus the control (water). When the significant difference was found, the mean test (Tukey at 5%
probability) was used. Under the conditions evaluated the biostimulants were not effective to
improve the performance of tomato seedlings when paclobutrazol was applied. There was a
positive effect in the increase of dry mass of leaves by the use of biostimulants only when not
using paclobutrazol. At 21 days after transplanting the application of paclobutrazol, still showed
residual effect, interfering in plant height, however, showed an increase in stem diameter, root
volume, liquid photosynthesis, stomatal conductance.
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SILVA, T. V. Influencia da idade da muda do tomateiro e da utilização de paclobutrazol e bioestimulantes. 2017. 76 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2017.