The objective of this work was to evaluate the white tabebuia (Tabebuia roseo-alba (Ridl.) Sandwith) seedlings emergence and growth in the beds according to different substrates. Two independent experiments were conducted. The emergence study was carried out in six substrates: 1- Plantmax®; 2- vermiculite; 3- sand; 4- soil + sand (1:1); 5- soil + carbonized rice husk (1:1); 6- soil + sand + carbonized rice husk (2:1:1) (v/v), and the experiment was set up according to a three-replicate randomized complete block design. The growth study of seedlings was carried out according to a five-replicate randomized complete-block design with five substrates: 1- soil + sand (1:1); 2- soil + semi decomposed chicken manure (1:1); 3- soil + carbonized rice husk (1:1); 4- soil + sand + semi decomposed chicken manure (1:1:1); 5- soil + sand + carbonized rice husk (1:1:1) (v/v). The height results of seedling emergence, emergence speed index and the stem height were observed with Plantmax®, vermiculite, soil + carbonized rice husk and soil + sand + carbonized rice husk. The best results of seedling height, stem diameter, chlorophyll index, leaf area, root length and the stem dry mass weight and root were observed in the substrates with semi decomposed chicken manure. It is recommended the use of P, V, SC or SAC for seedling germination and emergence and SACF or SCF for seedling growth of white tabebuia.
Tabebuia roseo-alba; germination; initial growth; agroindustrial wastes