Avaliação da emergência de plântulas de O. bacaba oriundas de diferentes localidades do Estado do Pará.

Abstract

The objective of this work was to evaluate the emergence of seedlings of O. bacaba, with seeds from three different locations in the State of Pará. 45 samples of 2 kg of fruits were obtained, taken at random from a mature bunch, each sample from a plant. The samples were obtained from three mesoregions of Pará: 1) 25 of the Lower Amazon municipality of Terra Santa – PA (02º 06' 16" S, 56º 29' 15" W); 2) 18 in the municipality of Northeast of Pará, in the municipality of Baião – PA (02º 047' 35" S, 49º 39' 46" W); and two in Southeast of Pará, in Marabá – PA (05º 21' 54" S, 49º 07' 24" W). A hundred fruits were pulped and the seeds were sown in a completely randomized design with 45 treatments, two replications and a plot of 50 seeds, evaluating six characters related to seedling emergence, with daily monitoring. Data were subjected to analysis of variance and means compared using the Scott-Knott test (p≤0.05). The 45 samples showed significant differences for five of the six evaluated emergence characters, demonstrating that the samples exhibited different behaviors. The means for the characters DIE, DE, DFE, PE, IVE and TME were 25.7 days; 33.9 days, 59.6 days, 74%, 0.7 and 40.4 days, respectively. Coefficients of variation ranged from 6.6% (TME) to 23.2% (IVE). The mean comparison test detected the formation of two (DIE, DE, IVE and TME) and four (PE) distinct groups. Regarding the means by origin, only the DIE character allowed to discriminate them. The emergence of seedlings in samples of O. bacaba from different provenances in the State of Pará shows a different behavior for most of the characters, with the percentage of emergence being the most discriminating character, with the level of provenance being just the character days to start of emergence. Management conditions also influence the onset of emergence.