Análisis de calidad de semillas de Tabebuia chrysantha Jacq. (guayacán) en la parroquia Dayuma, de la provincia de Orellana.

Abstract

The research proposed to analyze the quality of Guayacán (Tabebuia chrysantha Jacq.) seeds in Dayuma Parish, province of Orellana; determining its quality and germination percentage. To establish this quality, the seed sources were identified according to parameters (value from 1 to 6) of shape, height of bifurcation and dominance of the main axis, also determined in the seeds: the number per kilogram, percentage of purity, germination percentage (laboratory: samples of seeds in humid cotton at 24 ºC for 5 days) and their humidity; for the field part, once the specimens were identified, a bi-factorial experimental design was established with the specimens (A1, A2, A3) and substrates: S1: Soil 65% + sand 35%, S2: Soil 75%+ rice husk 25%, S3: Soil 50% + stick soil 50%, and S4: Control (Soil), which was distributed in 12 treatments; the seeds were soaked in distilled water at 25 °C for 24 hours and then direct sowing in 4" x 6" bags with the substrates, after 10 days the germinated seeds were counted, then the height of the seedlings and number of leaves were measured at 10, 15, 30, 30, 45 and 60 days; when the normality of the data was not met, the Friedman test was applied. The average percentage of moisture in seeds was 33.27 %, the A3 specimen reported the highest seed purity with 42.22 %, in nursery conditions at 60 days the T1 treatment obtained the highest germination percentage with 32 %, the T8 obtained the highest height of 7.05 cm. It is concluded that among the seeds of Tabebuia chrysantha there was a large amount of impurities, they are recalcitrant due to the amount of moisture and it is suggested to carry out complementary studies with the ISTA standards for seeds.