Crescimento e padrão de qualidade de mudas de Libidibia ferrea (Mart. ex Tul.) L. P. Queiroz submetidas a diferentes substratos e condições de luminosidade.

Abstract

Seedling quality evaluation is fundamental and crucial for the formation of forest plantations. This study aimed to evaluate the effect of different levels of luminosity and types of substrates in emergency and quality of Libidibia ferrea (Mart. ex Tul.) L.P.Queiroz seedlings. The treatment consisted in the combination of four substrates: (S1) = Clay + Sand + Plantmax® (1:1:1, v:v:v); (S2) = Clay + Cattle manure + Sand (1:1:1, v:v:v); (S3) = Cattle manure + Sand + Plantmax®(1:1:1:1, v:v:v:v) in four luminosity conditions: L1 = 80% of shading, L2 = 50% of shading, L3 = 25% of shading and L4 = full sun, using Sombrite screens, in conical tubes volume of 280 cm³. The evaluated items were emergency, height, diameter, dry matter content, root length, height/diameter correlation and Dickson quality index. The entirely randomized experimental design was used, with four repetitions. Considering these conditions, it was possible to conclude that the seedlings growth was influenced by the substrates and luminosity conditions, and that the S3 and S4 substrates, which had higher quantities of organic matter and nutrients, in full sun were able to provide the best results.