Abstract
Choosing a substrate is the determinant factor for the seedling producer; thus, the aim of this study was to evaluate the effect of different types of substrates on the emergence of "araticum-de-terra-fria" (Annona emarginata (Schltdl.) H. Rainer) seedlings. The experiment was carried out in a greenhouse and the experimental design was in randomized blocks, with three treatments and five replicates of 72 seeds per plot. The treatments consisted of the following substrates: coconut fiber, vermiculite and Plantmax® Citrus. The number of emerged seedlings was weekly counted for 105 days. Data regarding seedling height were obtained, and the emergence velocity index and mean time, besides total emergence percentage and that over time were calculated. Results from total mean emergence percentage, seedling height, emergence velocity index (EVI), and mean emergence time (MET) were subjected to analysis of variance and means were compared by the Tukey's test at 5% significance. The curves concerning the emergence percentage over time were fit by the logistic growth equation for each treatment and the means of each parameter (A, B, C) were compared by the Duncan's test at 5% significance. The substrates vermiculite led to the highest values of emergence percentage differing from the PlantMax® Citrus, but not of the coconut fiber, however the vermiculite promoted seedling height in a shorter time; therefore, this substrate is recommended for the initial development of "araticum-de-terra-fria" (Annona emarginata (Schltdl.) H. Rainer) seedlings.
Highlights
Among Annonaceae family, four species have great economic importance (MOSCA et al, 2006), sweetsop (Annona squamosa L.) and soursop (Annona muricata L.) in tropical regions, besides cherimoya (Annona cherimola Mill.) and atemoya (Annona cherimola Mill. x Annona squamosa L.) in subtropical areas (KAVATI, 1992; KAVATI, 1998)
Rainer) seedlings were observed at 35 days after sowing (DAS) (Figure 1), and the substrate vermiculite led to the highest emergence velocity, which was observed in the results from the analysis of variance regarding to the estimated parameters of the logistic growth equation (Table 1)
Verify with the vermiculite the biggest values for the parameter A in relation to substrate PlantMax® Citrus, besides both substrates did not differ of the coconut fiber substrate (Table 1)
Summary
Among Annonaceae family, four species have great economic importance (MOSCA et al, 2006), sweetsop (Annona squamosa L.) and soursop (Annona muricata L.) in tropical regions, besides cherimoya (Annona cherimola Mill.) and atemoya (Annona cherimola Mill. x Annona squamosa L.) in subtropical areas (KAVATI, 1992; KAVATI, 1998). Among Annonaceae family, four species have great economic importance (MOSCA et al, 2006), sweetsop (Annona squamosa L.) and soursop (Annona muricata L.) in tropical regions, besides cherimoya (Annona cherimola Mill.) and atemoya To propagate Annonaceae, and species Annona emarginata (Schltdl.) H. Has been used as rootstock due to its rusticity and adaptation to dry and flooded soils in places located at 950m above sea level (TOKUNAGA, 2005; RAINER, 2007). Aimed at keeping the constant increase in production fields, technical procedures such as the choice of suitable rootstocks must be adopted to assure the quality and the high productivity of orchards, since the commercial Annonaceae species are susceptible to pathogens present in the soil, including Phytophthora nicotineae, Pythium sp. Information regarding substrate type is essential in the germinative process and seedling set (WAGNER JÚNIOR et al, 2006), since substrate may vary according to structure, pH, aeration, water retention capability and degree of contamination by pathogens (KONDURU et al, 1999; BOOMAN, 2000; GONÇALVES et al, 2000; LIMA et al, 2001; SILVA et al, 2001), and may affect germination and seedling development due to its different ways of making water, light, temperature, nutrients, and O2 available (BEWLEY; BLACK, 1994; CARVALHO; NAKAGAWA, 2000)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
