BIOSSÓLIDO NA COMPOSIÇÃO DE SUBSTRATO PARA A PRODUÇÃO DE MUDAS DE Tectona grandis

This study aimed to evaluate the effect of biosolids as component of substrate for seedlings of Tectona grandis. The experiment was improved in six treatments with five repetitions each, such repetitions consisted of an average of five seedlings. The treatments were formulated with the following proportions of biosolids: commercial substrate (v:v); T1-20:80; T2-40:60; T3-60:40; T4-80:20; T5-100:0 and T6- 0:100. After a hundred twenty days the seedlings were collected for determination of the following morphological variables: stem diameter, plant height, ratio between plant height and stem diameter, dry mass of shoot, dry mass of roots, the total dry mass, dry mass ratio of shoot/root dry mass and the quality index of Dickson. Biosolids favored seedlings of Tectona grandis growth. Maximum seedling development was observed when it was used 60% to 100% of biosolids associated with the commercial substrate, which provided better development for parameters as plant height, stem diameter, total dry mass and Dickson quality index.