Influência de diferentes substratos no crescimento inicial de rosa do deserto (Adenium obesum forssk. Roem. & Schult)

Abstract

Although it is a relatively new ornamental plant on the market, the desert rose (Adenium obesum forssk. Roem. & Schult) is the fifth most traded in Brazil. Thus, the objective of this work was to evaluate the influence of different organic substrates on the development of desert rose seedlings. For development analysis, they were cultivated in vegetable soil for 9 days until germination, after which they continued to be watered daily for another 45 days, after which 60 individuals were selected and divided into 4 treatments for the experiment, namely: S1 (control group) 100% vegetable soil, S2 50% vegetable soil + 50% compost, S3 50% vegetable soil + 50% goat manure and S4 50% vegetable soil and 50% earthworm humus. The samples were kept in a greenhouse at random for 80 days and watered with 200ml at 48-hour intervals. After dismantling the experiment, the sample's morphometric data were collected and submitted to analysis of variance (ANOVA), and the means were compared by Tukey test at 5% significance. In all results, the treatments with goat manure and earthworm humus stood out and had results well above those of the control group, with averages such as leaf area and total size about five times larger than in the other treatments. Based on the results obtained, it was found that the treatments that best contributed to the development of Adenium obesum seedlings were treatments S3 (50% vegetable soil + 50% goat manure) and S4 (50% vegetable soil + 50% earthworm humus), proving that for seedlings of desert rose Adenium obesum (forssk. Roem. & Schult) the substrate porosity has a great contribution in its development.