SUBSTRATE COMPOSITION, VIGOR AND PHYSIOLOGICAL PARAMETERS OF TIMBAUVA SEEDLINGS (Enterolobium contortisiliquum (VELL.) MORONG)

The work aimed to evaluate the influence of the composition an organo-sandy substrate on the emergence and physiological parameters of growth in timbauva seedlings. The seeds were submitted to germination of the substrate in the following compositions: T1) 100% sand, T2) 75% sand + 25% Tecnomax (R), T3) 50% sand + 50% Tecnomax (R), T4) 25% sand + 75% Tecnomax (R), T5) 100% Tecnomax (R). The evaluations were performed at 45; 90; 135 and 180 days after sowing and measured the shoot height and stem diameter. At 180 DAS determined the dry mass of shoot, dry mass of roots, total dry mass and contents of chlorophyll a, chlorophyll b and chlorophyll total. The emergence and physiological parameters of growth were negatively affected by the unique composition of Tecnomax (R) as well as the values of chlorophyll b. The commercial substrate associated with inert material (sand) provided higher expression of seed vigor, higher levels of chlorophyll b and growth of timbauva seedlings.