Abstract

DIAZ-CHUQUIZUTA, Percy; VALDES-RODRIGUEZ, Ofelia Andrea  and  TELLO-SALAS, Cheryl. Germination responses in physic nut (Jatropha curcas L.) seeds to pregerminative treatments. Rev. Chapingo Ser.Hortic [online]. 2017, vol.23, n.2, pp.89-96. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2016.10.027.

Physic nut (Jatropha curcas L.) seeds may present germination problems due to their thick testa. Therefore, the aim of this research was to evaluate the effect of 13 pregerminative methods on germination and uniformity in the germination of seeds and uniformity in the emergence of physic nut seedlings. The methods involved combining water, Manilkara bidentata ash and cuy (Cavia porcellus) manure with one of two substrates (either sawdust or sand). A completely randomized split-plot design was used. Three replicates of 50 seeds were made for each treatment. Germination onset, germination percentage and emergence percentage were evaluated. The results indicated that soaking in water at 62 °C was lethal to the embryo, while direct sowing in sand led to the latest germination onset. Soaking in manure and rubbing with ash plus soaking in manure, regardless of the substrate, allowed starting germination in two days and reaching more than 90 % emergence; therefore, it is concluded that these pregerminative treatments were the best.

Keywords : soaking; cuy manure; ash; hot water..

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