Growth seedlings of poincianella pluviosa (Dc.) l.p.queiroz in different substrates and irrigation blades

Abstract

Currently, Brazil has a demand for 21 million hectares of forest restoration, and consequently, a great demand for good quality native species seedlings. It is important to employ techniques that reduce the costs of productive inputs as substrates and the irrigation water. In this context, the paper aimed to evaluate the growth of Poincianella pluviosa (DC.) L.P.Queiroz seedlings produced in four substrates elaborated with different solid wastes (sewage sludge, composted sawdust, and charcoal powder) and under two irrigation depths (0,03 L/h and 0,05 L/h). The experiment was conducted in completely randomized design with a 4 × 2 factorial arrangement (four substrates and two irrigation depths), eight treatments in total. The physical (porosity, density etc) and chemical (nutrients and organic matter contents) properties of substrates were evaluated. The seedlings shoot height, collar diameter, shoot, root, and total dry mass were measured. The substrates S1- pure sewage sludge and S2- sludge + sawdust (1:1) presented the better physical characteristics and substrates S1- pure sewage sludge and S3- sludge + charcoal powder (1:1) showed the better nutritional composition. For the growth in height there were no difference between the substrates and the irrigation depths. The substrates formulated with 50% of sludge and 50% of sawdust or charcoal powder, combined with the higher irrigation depth, resulted in seedlings with higher collar diameter, biomass, and quality, for which they are recommended to produce P. pluviosa.