Germinação de sementes de cumaru (Dipteryx odorata (Aublet) Willd.) sob diferentes substratos

Abstract

The indication of substrates to produce forestry native species is somewhat limited. The aim of this study was to use as a substrate for growing Dipteryx odorata, known as coconut's fiber's powder (CFP), and carbonized rice husk (CRH), pure or mixed, in different concentrations, trying to identify which of the different situations is more favorable for germination. The experiment was conducted at the hotbed's greenhouse of Federal University of Mato Grosso at the Campus of Sinop - MT. The experimental design was completely randomized, with three replicates per treatment, where each plot consisted of five individuals. The coconut's fiber's powder was obtained by artisanal production in own hotbed of the University, and the carbonized rice husk was provided by a company in the forestry industry. The following combinations were evaluated: 100% CRH; 100% CFP; CFP 50% and 50% CRH; CFP 75% and 25% of CRH; CFP 25% and 75% of CRH, and subsoil in forty-five days. The collected data were submitted to analysis of variance and means were compared using the mean comparison test (Tukey test), at 5% significance level. The germination began ten days after planting the average germination percentage was 29%. The combination consisting of 75% of powder of coconut fiber plus 25% carbonized rice husk and the use of only subsoil's land, provided a good water retention and higher percentages of cumaru seed germination.