Desenvolvimento inicial e qualidade de mudas de ipê-roxo (Handroanthus heptaphyllus (Vell) Mattos) conduzidas em diferentes substratos e recipientes

Abstract

The present work sought to evaluate the influence of different substrates and different types of containers on the initial development and quality of seedlings of Handroanthus heptaphyllus (Vell) Mattos. Therefore, the experiment was conducted in a 3 x 3 factorial scheme, where three containers (Tube, TNT and Plastic bag) and three substrate formulations (100% Maxfértil®, 75% Maxfértil® + 25% Pindstrup® and 50% Maxfértil® + 50% Pindstrup®). The evaluations carried out were emergency at 30 days after sowing and at 60, 90 and 96 days after sowing, morphological parameters such as height (H), stem diameter (DC), number of leaves (NF), mass shoot dry mass (MSPA), root system dry mass (MSR), robustness quotient (H/DC) and Dickson Quality Index (DQI). Also, the seedlings that had a wet lesion in the stem region were removed from the experiment to investigate the causative agent. At 30 days after sowing, due to the low temperatures, the seedlings showed low emergence, making it impossible to evaluate the variables. The seedlings in TNT containers, after isolation, showed symptoms of Fusarium spp. Regarding the factors evaluated in the analyzed variables: height, number of leaves, dry mass of the shoot and root system, robustness quotient and Dickson Quality Index, there was no significant interaction between them, and the dry mass of the root system showed a significant difference when using the plastic bag. In relation to the diameter of the collar, there was a significant interaction between the evaluated factors, showing that the best development of the seedlings occurred in the plastic bag with the mixture of substrates.