Resumo

FLOR-CAMPO, Luis Miguel  e  GRASS-RAMIREZ, José Fernando. Physical characterization for the use of coconut pith from the Pacific Coast of Caucana, Colombia. Acta Agron. [online]. 2023, vol.72, n.1, pp.23-29.  Epub 23-Abr-2024. ISSN 0120-2812.  https://doi.org/10.15446/acag.v72n1.108072.

Coconut mesocarp is a residual material from the production of coconut on the Pacific Coast of Caucana; however, coconut fiber and pith can be extracted from the mesocarp, the latter, with a high potential for use for the production of culture substrates. Therefore, the objective of this study was to make a morphological, physical and phytotoxicity characterization of the coconut pith from coconut samples of the typical, Malay and hybrid varieties from the municipalities of Guapi, López de Micay and Timbiquí, on the Pacific Coast of Cauca. The proportion of the mesocarp at morphological level with respect to the fruit did not differ between the plants and ranged from 35.27 % to 48.48 %. The particle size with a proportion greater than 2.0 mm and less than 0.24 mm was found in the samples T-A2 and G-A2, respectively, while the parameters of water retention capacity, apparent density, pH, and electrical remained similar in all samples, with values between 92.73 ± 0.04 to 94.55 ± 0.03 % p/p; 0.04 to 0.0528 g/cm3; 5.593 to 6.032 and 3.51 to 3.83 dS/m, respectively. While the Munoo-Liisa vitality index was in a margin similar to the control (%MVL = 100), only a slight inhibitory effect was present in the degree of germination in the 1.0 g/L dilution, with which, there is no direct risk to the plants and it can be a usable material in the preparation of a culture substrate.

Palavras-chave : phytotoxicity; degree of germination; coconut pith; mesocarp; culture substrate.

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