Abstract

NAVARRO, Marlen et al. Use of the Weibull function to evaluate the emergence of Albizia lebbeck (L.) Benth seedlings. Pastos y Forrajes [online]. 2013, vol.36, n.2, pp.215-221. ISSN 0864-0394.

In order to know the vigor of Albizia lebbeck seeds through the evaluation of seedling emergence, by means of the modified Weibull function, planting was performed under three environmental conditions and at different seed storage times. The design was completely randomized, with factorial arrangement. Variance analysis was conducted for parameters M (maximum cumulative emergence), k (emergence rate) and Z (delay for emergence onset) of the modified Weibull function. From the six months after the beginning of storage (44,1 %) the sudden loss of M percentage in the nursery (A) and slight variations in the chamber (C) were observed, as compared with A and B (crop house). The dispersal range of parameter k oscillated between 0,4-2,6; 0,29-1,9 and 0,5-1,4 % emergence d^-1 for the evaluations made in A, B and C, respectively. From the analysis of Z it was interpreted that the time for the onset of emergence, regardless of the seeding environment, was framed between 3,0 and 7,3 days after planting. In the nursery under full sunlight, in the evaluation at 6 mos (months of storage), the best results of the biological parameters of the Weibull equation were obtained, which allowed a global analysis that indicated a high vigor degree in the A. lebbeck seeds, as compared with the other evaluations

Keywords : Albizia lebbeck; storage; emergence.

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