Hydropriming and substrates affect the emergence and production of Calendula officinalis L. seedlings /Hidrocondicionamento e substratos afetam a emergencia e a producao de mudas de Calendula officinalis L

In order to establish protocols that can contribute to the propagation of medicinal plants, this study evaluated the effect of hydropriming and substrates on the emergence and production of Calendula officinalis L. seedlings. Seeds were submitted or not to hydropriming for 24 hours, and subsequent sowing in four substrates: S1) 100% Dystroferric Red Latosol--DRL, S2) DRL + coarse sand (1:1 v/v), S3) DRL + Tropstrato[R] commercial substrate (1:1 v/v) and S4) 100% Tropstrato[R], and kept in greenhouse with 50% shading. Higher emergence percentage in substrates with the presence of DRL was observed. Seed hydropriming impaired seedling emergence, but contributed to root growth, biomass production and seedling quality. The 100% Tropstrato[R] substrate favored higher dry mass production and seedling quality. Positive linear correlation ([greater than or equal to] 0.70) was observed between shoot and root growth characteristics with biomass production and Dickson's quality index. Principal component analysis explained 78.95% of the experimental variance, excluding the first count and the shoot/root ratio with low representativeness. In the cluster analysis of Euclidean distances, seedlings with the greatest similarity were those produced with 100% DRL and DRL + Tropstrato[R] with and without hydropriming, respectively. Dystroferric Red Latosol is recommended pure or combined with Tropstrato[R] for the production of C. officinalis L seedlings, and the hydropriming impaired seedling emergence characteristics. Key words: calendula, Dickson quality index, pre-soaking, Tropstrato[R]. Com a finalidade de estabelecer protocolos que possam contribuir na propagacao de plantas medicinais, objetivamos, com este estudo, avaliar o efeito do hidrocondicionamento e substratos na emergencia e producao de mudas de Calendula officinalis L. As sementes foram submetidas ou nao ao hidrocondicionamento durante 24 horas, e posterior semeadura em quatro substratos: S1) 100% Latossolo Vermelho Distroferrico--LVD, S2) LVD + areia grossa (1:1, v/v), S3) LVD + substrato comercial Tropstrato[R] (1:1, v/v) e S4) 100% Tropstrato[R], e mantidas em viveiro com 50% de sombreamento. Observamos maior percentagem de emergencia nos substratos com presenca de LVD. O hidrocondicionamento das sementes prejudicou a emergencia das plantulas, mas contribuiu no crescimento de raiz, producao de biomassa e qualidade das mudas. O substrato 100% Tropstrato[R] favoreceu maior producao de massa seca e qualidade d