Emergência e crescimento de mudas de Schizolobium parayba Var. Amazonicum (Huber x Ducke) Barneby em tubetes sob diferentes substratos

Abstract

Due to the use of alternative and rapid growth made the paricá one of the native species most used for reforestation in the country. It’s important to know and study the forestry of this species, especially the production of seedlings. Thus, the aim of this study was to assess the emergency and growth seedlings Schizolobium parayba var. amazonicum (Huber ex Ducke ) Barneby in tubes under different substrates. The statistical design was a randomized entirely , subdivided in time, with three replications, in a factorial 6 x 2, six types of substrates (S1-100% of soil, soil S2-75% 25% cattle manure, S3-50% soil, 50% of cattle manure, soil S4-25%, 75% cattle manure, S5-100% commercial substrate Plantmax®, S6 100% vermiculite) and two volumes of containers (R1 280 cm3, R2-180 cm3) containing individual portion. The emergence speed index data (IVE) and percentage of emergency (EP) were obtained. The variables stem diameter and seedling height were measured and the averages compared by Scott-Knott test. Linear regression was used to verify the effect of height or diameter depending on the age, container or regression. Only substrate by means of the S4 treatment had lower values of ESI and PE. The S5R1 treatments (100% Plantmax®; 280 cm3) and S6R1 (100% vermiculite; 280 cm3) obtained higher growth in height and diameter. As the average weekly growth, S3R1 treatments (50% soil, 50% of cattle manure; 280 cm3) and S5R1 (100% Plantmax®; 280 cc) achieved better results. The modeling demonstrated that it is possible to produce seedlings with 43 days from the S5R1 treatment and can reduce production time and farmed costs.